solar panels for sailboats reviews

Top 3 Best Solar Panels For Sailboats

Last Updated by

Daniel Wade

June 15, 2022

Choosing whether or not to install solar panels on your sailboat is a big decision. They are not exactly cheap, though they can start to pay themselves off pretty quickly.

This article is going to cover not only why you might want to use solar panels but all the benefits they provide. You will also find a helpful guide on which solar panels would be best for you and your budget. Hopefully, by the end, you will feel confident in your decision to install solar panels on your sailboat and even have an idea of which ones you might like.

Table of contents

Are solar panels on sailboats necessary?

Whether or not you should be installing solar panels on your boat is a matter of choice, not out of necessity. Sailboats get their power from the wind, by harnassing it in their sail. So if you plan to be sailing for the afternoon you probably don’t need solar panels.

You could charge a battery pack from the marina and that will probably see you through several trips. The problems only really start to arise if you are planning to be on your sailboat for longer periods, or even permanently. If you plan to live on your sailboat year-round, even if you spend 80% of it in a marina, you would be better off with some solar panels. Even if it is just as a backup source of power.

Are solar panels on boats safe?

Solar panels are generally pretty safe. They have no moving parts and typically have a very strong protective cover over them so you never come in contact with the electrics themself. So, as a source of power, they are generally pretty safe. The only time they may become unsafe is if they are badly damaged.

Solar panels are often covered by glass plating that keeps them safe. It also helps them absorb sunlight and warmth. This is great, except when the glass breaks. If the glass protective cover on your solar panels should crack and splinter you are at risk of serious injury from sharp shards of glass. Not only is the glass itself dangerous at this point, so are the electronic components inside. They have powerful currents running through them, and if you come in contact with them you may be in for a shock.

Furthermore, if these electronics get wet they can become deadly. Electricity and water do not mix well at all. Being as you are on a sailboat, at sea, the chances of them getting wet is very high. Luckily, the chances of them breaking in the first place are slim to none. The only real way they would break, besides vandalism, is by debris hitting them during a bad storm. There is not often debris at sea, so this shouldn’t be too much of a problem.

What are the benefits of having solar panels on a sailboat?

There are so many great benefits of having solar panels on a sailboat. They can be a lifesaver if you find yourself at sea for a long time. There benefits range from trivial comforts to being the difference between life and death. Here are some of the benefits you might not have considered about having solar panels installed on your sailboat.

Money-saving

Solar panels are not cheap, it is far cheaper to just run a generator or charge your batteries from the marina the whole time. At least, it is in the short term. Over time, it can start to become very expensive. With solar panels, you are looking at a big initial cost (the solar panels themself) and then it’s smooth sailing. You don’t need to pay for power again. Solar panels last for about 40 years before they start to become too inefficient at producing power. The cost of a few solar panels upfront compared to 40 years of marina fees and gasoline for a generator is the financially savvy move.

Emergency power

If you find yourself at sea, the wind dies down (or becomes too strong), and you find yourself stuck bobbing around waiting for more favorable conditions you may run into trouble. Depending on how long you are out there, you may find yourself with dead electronics. Be it a satellite phone, radio, or secondary engine (depending on the boat). Having a set of solar panels and a power bank can be a genuine lifesaver in these situations.

Comfort amenities

Whether you are day sailing or making a week-long voyage, having access to the comforts in life can make the whole journey so much more enjoyable. The amenities may not be available to you without having a constant source of power at sea. Having access to a kettle, tv, videogame system, radio or microwave oven may be the only thing keeping you going at rougher times. As exciting as sailing can be, when you aren’t sailing and are just bobbing around it can be quite dull. The sea is beautiful, but there is only so much time you can spend looking at the water before you miss the comforts of land. With solar panels, you can bring those comforts with you.

Eco-friendly

There are only two alternatives to solar panels. A gasoline generator, and taking power from the grid. Neither of these is good for the environment. Luckily, solar panels are a great third option. Solar panels are completely eco-friendly and are great for the environment. This is not just great for the earth, and your conscience, but for the journey itself. If you are running a gasoline generator at sea you are going to be listening to it thrumming away and smell the burning gasoline. Wouldnt you prefer silence and nothing but the smell of the sea breeze?

How much do solar panels cost?

How much solar panels cost is almost entirely tied into both their voltage/wattage and whether or not they are portable panels. Portable solar panels are great for people who don’t spend a lot of time on their boat or are happy enough living off the marina’s power grid. Permanent solar panels, the kind that may need to professionally installed, can end up costing far more. They are also likely to be far superior and you can pretty much forget about them once they are installed.

Portable solar panels will cost just a few hundred dollars each. You will need a few to be sustainable, but that’s not going to be much of a problem. These portable solar panels can just be rolled out on the deck of your boat, weighed down, and then hooked up to a battery pack. The battery itself here is going to be the most expensive part of the whole set up. A decent-sized battery could set you back a $1000. But, when charged fully it will last days. Even with constant use.

Permanently installed solar panels can cost one or two thousand dollars in some cases. The advantage here though is once they are installed that’s it, you can forget about them. You don’t have to put them up, take them down, and find somewhere to stow them every time they need using. They too will need to be hooked up to a battery, the battery is still only going to cost you $1000. If you are installing permanent solar panels because you plan to be making long voyages, it is ideal to have two or perhaps even three large batteries hooked up to your boat. One to run off, one or two for emergencies.

How do I maintain my solar panels?

Solar panels, unlike gasoline generators, are generally pretty easy to maintain. They have no moving parts and are thus pretty self-sufficient. They don’t need taking apart and they last as long as 40 years. That being said, if they do break they need repairing as soon as possible. The exposed electrics can be deadly when water is thrown into the mix. Which, on a boat, is almost always. The glass cover will need replacing and the electronics inside may need repairing, though not always. Don’t ever attempt to do this yourself unless you are experienced at making these repairs. The cost of hiring someone to do it for you is preferable to being dead. Solar panels have very powerful electric currents, that when in contact with water and yourself can be fatal. As mentioned above, these panels rarely break so you will likely not ever run into this problem. If you do, hire a contractor.

Do my solar panels need cleaning?

Solar panels work by converting the light and heat of the sun into useable power. The process itself is rather complicated but the results are simple to understand. That being said, there are some reasons that your solar panels will stop working as effectively. They all revolve around a lack of sunlight. It could be because it is night time. It could be because it is very cloudy. Or, it could be because they are dirty. If solar panels become too dusty, dirty, and become too covered in grime they stop operating at maximum efficiency. This is not as much of a problem at sea, the sea spray stops dust settling. The biggest thing you will need to clean off your solar panels is salt build-up and slime. This is easy enough to do with some warm soapy water. Freshwater, not seawater. You want to be removing as much salt as possible. Salt is corrosive to electronics, so removing it is important. Never clean your solar panels using pressure washers as they can crack the glass.

Which are the best solar panels for sailing?

There are so many options on the market at various price points. Here are three very different options that will all make good choices, depending on your needs. It is important to consider not just price but power output. Spending a lot of money on solar panels now might not feel ideal, but it is the most cost-effective decision.

1. Renogy Starter Kit

This starter kit is going to be perfect for installing on almost any sized boat. There are four solar panels, each can be fitted permanently to the boat. They can be mounted (and unmounted) easily, for your convenience. They do require a flat surface, but they are small enough that that likely won’t be too much of a problem. This starter kit is very middle of the pack price-wise but should provide enough power for a small to medium-sized vessel easily. It is also possible to buy extra panels individually should you need them.

Wattage: 400/4 (100 per panel)

2. Nature Power Rigid

The nature power rigid is a large, powerful, single solar panel. If you are looking for the right panels to power your entire boat comfortably, these are the ones for you. They are very large so they will need a large flat surface area. alternatively, they can be hung vertically from rails. This is an inefficient way of using them, so you would need to buy more this way. Nature power makes various solar panels so you could find some smaller ones of the same brand to supplement it. This one is not so easy to install, you might need to hire someone to install it for you.

Wattage: 165

3. Nature Power Monocrystalline

Nature power makes a portable solar panel that fits inside a special briefcase. It is perfect for stowing away easily and only taking it out when it is needed. It is decently powerful considering its portable, but there is the inconvenience factor of having to set it up each time. If you planned to buy the nature power rigid, buying one of these portable panels might be ideal for supplementing your power supply when it is especially sunny. Though, it may be cheaper for you to just fit more of the Nature Power Rigids.

Wattage: 120

Hopefully, you now have a good idea about whether solar panels would be right for you and your sailboat. Sailing is great, but the lack of power at sea can be dreadfully boring. Luckily, there are so many great options available on the market. Not just the ones mentioned above. Buying a solar panel is an investment, the initial cost is minor compared to the steady return from all the savings you will make.

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I've personally had thousands of questions about sailing and sailboats over the years. As I learn and experience sailing, and the community, I share the answers that work and make sense to me, here on Life of Sailing.

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Picking the best solar panels for a sailboat: Buyer’s guide

• 18 Aug 2022

You might have already heard of brave sailors that conquer the oceans with nothing but wits and solar panels. For instance, this year 83-year-old Kenichi Horie became the oldest person to sail solo from the US to Japan on a solar-powered boat. These stories are inspiring, but picking panels for your boat yourself can be a small challenge in itself. That’s why we wrote a short article about the best solar panels for sailboats and how to recognize them.

Start from type of solar panels

When it comes to solar panels for sailboats, their weight and size matters more than with PV modules for residential systems. Efficiency is important but power — not that much, because the energy needs of a boat are relatively low. The first thing you’ll have to decide about your panels is their type.

Generally, you’ll choose between thin-film panels and monocrystalline modules. While polycrystalline panels are still around and they are indeed cheaper than mono panels, they are much less efficient, which means they’ll need more space and add more weight to your boat.

Thin-film panels are light and cheap

Thin-film or flexible solar panels bend well and they are very easy to install which makes them a great choice for boats with difficult configurations. Some sailors say that flexible panels are the best choice for fast boats because they don’t impact the aerodynamics of a vessel as much as rigid panels do.

The downside of flexible panels is their low wattage. If there are many appliances on board, you’ll need several panels and you’ll need to find the right place for each of them. They also age faster than rigid panels — a thin-film panel generally lasts for 10-15 years.

Monocrystalline panels are powerful and reliable

Rigid solar modules, monocrystalline and polycrystalline, are heavier and bulkier than thin-film panels. You can fix flexible panels with adhesives, but rigid panels require drilling. They are also more expensive than flexible panels. 

On the other hand, monocrystalline panels are the most efficient type of panels which means that they provide more power for less space. Even one powerful mono panel can be enough for everything that you’ve got on board. They are also much more reliable and will survive any storm that is coming your way. A monocrystalline panel lasts for at least 25 years.

Panels for boat should be efficient and sturdy

The best solar panels for sailboats don’t have to be powerful, but they better be efficient — find the number in the datasheet. For rigid panels anything over 18-19% is fine. Panels also should be sturdy enough to withstand seastorms. You generally also want good shading tolerance since panels often get shaded by masts and sails. Finally, good performance in low-light conditions is appreciated.

Picking bifacial panels, 72/144-cell panels or larger, anything too powerful generally doesn't make a lot of sense. Performance at high temperatures matters less than it does with home systems. Warranties also play a lesser role. You won’t be able to make use of them because they generally have effect only for residential installations.

The markets of thin-film and rigid panels are different. Generally, a manufacturer of flexible panels doesn’t offer mono- or poly-panels. Canadian Solar, Q CELLS and Jinko Solar are good choices when it comes to monocrystalline modules for boats. Renogy , WindyNation and PowerFilm make fine thin-film panels.

Do the math before purchase

The amount of power for your boat depends on the number of appliances on your board. There are two main ways to determine the size of installation that you need. You can take a test trip and see how much of your battery’s charge you’ve spent in one day. You can also do the calculations manually: write down all the appliances on the board with their power rating and number of hours in use per day. You can read about it in detail in our article " How much solar power to sail the seas? " It doesn’t make sense to oversize a marine PV system, because all the excess power will just go to waste.

Keep in mind that adding photovoltaics doesn’t make your vessel a solar boat, unless you have a solar-powered motor. You can switch your boat to solar energy fully, especially if it’s small, but you’ll have to calculate your energy needs accordingly.

Once you’ve purchased your panels, you’ll have to install them properly. You can order professional service or do it yourself. The most popular places for solar panels on a boat are a stern rail, masts, deck and canvas. Thin-film panels can even go on the sails. Ideally, you want a place where panels wouldn’t be shaded by masts on any other parts of a boat.

List of solar panels for a sailboat

We’ve asked our engineer to pick the panels that would complement a small boat well. These are his choices:

ZNShine Solar ZXM6-NH120-370/M

Solar panels from ZNShine Solar are inexpensive and fit all kinds of applications, including boat systems. ZXM6-NH120-370/M provides 370 Watts of power with a 19.88% efficiency. It performs well in low-light conditions. Graphene coating increases power generation and allows self-cleaning. The only downside is a lower wind tolerance, compared to other models: it is rated to withstand 2400 Pa pressure which is comparable to 140 mph wind.

Mission Solar MSE345SX5T

MSE 345 is a simple solar panel for all kinds of applications, including boat installations. Mission Solar panels are manufactured in Texas. The module provides 345 Watts of power with 18.7% efficiency. It is certified for high snow (5400 Pa) and wind loads (4000 Pa). The model is resistant to salt mist corrosion.

Suntech STP 365 S

Suntech is a Chinese company that offers quality budget-friendly solar panels. The STP365S model stands out in line because of its great performance in weak light, such as cloudy weather and mornings. It is designed to withstand harsh weather conditions, and the module is certified to tolerate wind of over 170 mph. Half-cut design makes cells sturdier and improves shading tolerance. Overall, this panel earns a place among the best boat solar panels.

Andrey had been a news editor and freelance writer for a number of medias before joining A1SolarStore team. Climate change and its impact on people's lives has always been among his interests and it partially explains his degree in Philosophy and Ethics.

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Best Solar Panels For Sailboats of 2024

Sailing uses the power of the wind to move, so why not use the power of the sun to charge your batteries? Solar panels offer the best way to charge boat batteries. This method can also save the engine from being used just for charging. Getting the best solar panels for sailboats means choosing the right size and power for your boat.

But, how much power will you need? Will your panels be able to keep up even on cloudy days? Do you plan to sail in cold water or deep in the tropics? Do you need the panels to sit on a curved surface? There’s a surprising amount of factors to consider when purchasing sailboat solar panels.

Whether you’re replacing old panels or buying for the first time, let us do the hard work of comparing the best solar panels for your boat.

For more of our top sailing gear recommendations, check out the Best Wind Generators for Sailboats . 

QUICK ANSWER – THE BEST SOLAR PANELS FOR SAILBOATS 

• Nature Power Monocrystalline
• Nature Power Rigid
• Renogy Starter Kit (4 panels)
• Newpowa Poly Solar Panel
• Acopower Polycrystalline
• Nature Power 90W Rigid
• Newpowa 150W
• Suaoki SunPower
• Eco-Worthy Semi-Flexible

SAILBOAT SOLAR PANEL REVIEWS

Nature power monocrystalline.

Check out the latest price on: Amazon  | West Marine

BEST FOR: Efficient high-power use

WEIGHT: Unspecified

WATTS/AMPS: 120W/6.6A

SIZE: 45.1” x 33.6” x 3”

PROS: Foldable for easy storage and portability, pop-out legs that allow it to easily sit at an angle, sturdy design

CONS: On the upper end of the price spectrum, short warranty

NATURE POWER RIGID

BEST FOR: Energy-hungry boats

WATTS/AMPS: 165W/9.4A

SIZE: 57.8” x 26.3” x 1.4”

PROS: Powerful and efficient, scratch resistant and anti-reflective coating, well-built aluminum frame, easy-to-use connections

CONS: Powerful but expensive, only suitable for larger boats with a big flat space to set it up on

RENOGY STARTER KIT (PACK OF 4 PANELS)

Check out the latest price on: Amazon

BEST FOR: Large boats needing lots of power

WEIGHT: 18.0lbs

WATTS/AMPS: 400W/22A

SIZE: 4 x 47.0” x 21.3” x 2.0”

PROS: Includes x4 100W panels along with a charge controller and everything else needed to set up, ideal for sailors looking for a lot of power, easy mounting system, great price for a comprehensive kit

CONS: Rigid solar panels can only be on flat surfaces or mounted on rails, included charge controller might not be the charge controller for your needs

NEWPOWA POLY SOLAR PANEL

BEST FOR: Keeping small battery banks topped up

WEIGHT: 6.3lbs

WATTS/AMPS: 30W/1.7A

SIZE: 27.0” x 14.3” x 1.9”

PROS: Sturdy design, small and slim making it ideal for stern rail, wattage should be enough to trickle-charge medium battery banks, very affordable

CONS: Rigid design means placement is limited, heavy for a small panel

ACOPOWER POLYCRYSTALLINE

BEST FOR: Larger sailboat trickle-charging

WEIGHT: 6.9lbs

WATTS/AMPS: 35W/2A

SIZE: 29.9” x 16.1” x 1.7”

PROS: Looks neat with silver aluminum frame, should be able to easily keep batteries topped up and contribute to energy requirements when boat is in use, very affordable and slim, other wattages available

CONS: Weighty, aluminum frames can have sharp corners

NATURE POWER 90W RIGID

Check out the latest price on: West Marine

BEST FOR: Permanent mounting

WEIGHT: 15.2lbs

WATTS/AMPS: 90W/4.9A

SIZE: 33.7” x 26.5” x 1.0”

PROS: Sturdy frame can be mounted on gantry rails permanently, good power output and small enough to be mounted alongside an identical panel for double power, long warranty, reputable brand

CONS: Awkward to move about the deck so not ideal for portable panel, fairly heavy

NEWPOWA 150W

BEST FOR: Medium to large sailboats

WEIGHT: 24.4lbs

WATTS/AMPS: 150W/8.3A

SIZE: 58.4” x 26.6” x 1.2”

PROS: Great for permanent mounting, powerful and well-built,

CONS: Very heavy, only comes with 3ft of cable which may well be too short and require extension

SUAOKI SUNPOWER

BEST FOR: Smaller, lightweight sailboats

WEIGHT: 4.8lbs

WATTS/AMPS: 100W/5.6A

SIZE: 43.3” x 22.4” x 0.1”

PROS: 30-degree curve possible making this ideal for boat coach roofs, very thin makes for less dirt buildup and less wind resistance, good price for a powerful panel

CONS: Cable connections are on the top of the panel which may encourage corrosion and UV damage

ECO-WORTHY SEMI-FLEXIBLE

BEST FOR: Coach roofs and curved deck areas

WATTS/AMPS: 100W/5.5A

SIZE: 47.4” x 21.6” x 0.1”

PROS: Capable of a 30-degree curve making it suitable for coach roofs and curved decks, thin and durable construction

CONS: Connector on top allowing salt build-up and accidental damage

COMPARISON TABLE – THE BEST SOLAR PANELS FOR SAILBOATS 

How to choose the best solar panels for sailboats, 1. required energy.

Buying solar panels for your sailboat involves more than going over a few models at random. You need to know how much power you’ll need daily. Also, you need to determine whether you will rely solely on solar power or use the engine as well.

SOLAR AND ENGINE

Will you use solar power most of or all the time? If yes, then you will need higher power, larger or more solar panels. If you plan to use the engine more, then you won’t need as much solar power.

Your sailing goals come into play in this decision. If you want to cruise the intercoastal waterways, chances are you’ll be using your engine a lot. If you plan on cruising the Caribbean, you can often rely on good winds for sailing.

Once you’ve worked out how you plan on powering your sailboat – solar and engine, or just solar – you’ll need to work out your daily amp draw . If you’ll be running a fridge, freezer, water maker, VHF and SAT NAV all day long, you’re definitely going to need a lot of power!

It can be difficult to determine how many amps your sailboat will need, especially if you still don’t have all the electronics you plan to bring on board. Some products will give you an idea of their power draw in their technical specifications. For others that don’t provide that information, you may have to settle for an estimate.

Once you have an idea of your daily amp draw, then you can work out the solar output required to keep up with that power draw. But there are other considerations too, namely, actual output vs maximum output.

ACTUAL OUTPUT VS MAXIMUM OUTPUT

While a 90W solar panel might sound like it’ll give out 90W, remember that this is its maximum output. That is, it refers to a clean panel in full sunshine. It won’t be giving anywhere near that output on cloudy days. In the case of a fixed panel, ask yourself if the sail will be casting a shadow over it on one tack.

Unless you plan on running the engine to top up the batteries on cloudy days, you will find yourself needing enough solar panel output for these times. Make sure to also consider the times when your panels aren’t giving out their optimum performance.

TEMPERATURE CHANGES

If you’re starting in Nova Scotia, your fridge won’t take much power to keep it at a cool temperature. But, what happens when you sail south to go diving in Mexico ? Suddenly, the water temperature is higher and the fridge would have to work twice as hard to stay cool. While good insulation is a bonus on a sailboat, it’s important to remember that atmospheric changes like temperature may mean an increase (or decrease) in your power requirement.

ARE WE TALKING AMPS OR WATTS?

While you need to know how many amps your sailboat will draw on a daily basis, solar panels are sold by watts. There’s no need for that to be confusing though, as we’ve also provided the amps in the chart. You can read more about watts and amps to get a better understanding.

2. HOW MANY SOLAR PANELS DO YOU NEED?

Many sailboats have more than one solar panel. This means you won’t need to move the panels to follow the sun or as the boat shifts at anchor. Having multiple solar panels also allows you to have smaller panels, which tend to get in the way less. Your required power output can be divided among them as well.

If you need 200W a day, then you could have three 90W solar panels on different parts of the boat and be covered power-wise, even on different tacks.

How much space do you have on deck? Where you place your solar panels is very boat and sailor dependent. Day-sailing in hot places? Solar panels on the bimini rack are an easy solution. Long-distance cruising? You’ll need solar panels that are efficient yet out of the way to improve windward performance.

If you spend a large amount of time on board, your energy consumption will be higher. You’ll need your solar panels to be as efficient as possible. Many cruisers have panels on top of gantries on the stern to keep them in sunshine all the time. This is terrible for sailing performance, so you have to think about where you want to compromise. Don’t forget to consider the other on-deck items, such as your paddle board , as well.

Solar panels generally come in two types: mono- and multicrystalline and amorphous thin film silicone. However, all solar panels listed in this article will be mono- or multicrystalline as they are the most effective.

MONO- AND MULTI-CRYSTALLINE

Efficient and sturdy, these panels will probably make up your core solar panel collection. For everything on board like lights, fridge, radio and navigation electrics, mono-and multicrystalline are your best bets. They aren’t forgiving on cloudy days though, and even a shadow over the corner of a panel will pull down the output by a lot.

AMORPHOUS THIN FILM SILICONE

Not as efficient as crystalline panels, amorphous panels are cheaper and flexible. They’re good for trickle-charging batteries while the boat is left unattended.

Solar panels are expensive, but their prices have been dropping over the years. If you only use your sailboat for summer weekends, chances are you won’t need pricey, hyper-efficient panels. You just need enough to keep up with your power consumption for two days a week and let the trickle-charge solar panel do the rest.

Take your solar panel budget and split it between the number of solar panels you think you’ll need. Keep in mind though that you’ll most likely need to buy a charge controller as well.

For more of our top sailing gear recommendations, check out these popular buyer's guides:

Sailboat Anchors

Sailboat Winches

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Solar Panels for Sailboats

Bilge Pumps

9 Best Solar Panels for Sailboats

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Solar panels have become game changers when it comes to supplying power while off the grid. Marine solar panels can charge anything from batteries to computers to bigger electronic appliances. What are the best solar panels for sailboats? 

The 9 best solar panels for sailboats are: 

• Renogy Flexible Solar Panel
• Newpowa Solar Panel
• SunPower Flexible Sol ar Panel
• Eco-Worthy Off-Grid Solar Panel
• Rich Solar Polycrystalline
• Topsolar Flexible Solar Panel
• HQST Monocrystalline Solar Panel
• WindyNation Solar Panel Complete Off-Grid
• DOKIO Solar Panel Kit

This article will explore everything you need to know about the best marine solar panels. 

Table of Contents

Solar Panels on Sailboats: An Overview

Before exploring the best solar panels, it is helpful to consider how solar panels on sailboats work and how many you need. Solar panels sit on different parts of a sailboat’s surface and absorb the sun’s rays, converting them into energy. This energy is used to power chargers, fridges, cooking stoves, and other electronics you need for self-sufficient sailing. 

Worth noting is that today we will only discuss solar panels and not the batteries, which of course is an essential part of a complete system; we will also not discuss charges or charge controllers.

The products in this post will get you started in the right direction, but if you’re looking for a high-output system, then I suggest you contact someone that can help you calculate your energy requirements.

How Many Solar Panels Do I Need for My Sailboat?

You will need between 2-8 solar panels for your sailboat. The exact amount depends on your sailboat’s space and how many electronics you need to power. Most solar panels can absorb between 100-300 watts per hour. On average, you will need approximately 1500 watts of power each day. 

If your solar panels absorb 1500 watts daily, here’s what they can power on your sailboat: 

• A laptop charger
• A microwave 
• A coffee maker 
• An induction cooker 

If you want to power more heavy-duty electronics like a washing machine or a television, look for solar panels that absorb 400 watts. For heavy-duty electronics, try installing 5-8 solar panels. 

Flexible vs. Rigid Solar Panels

The three main types of solar panels are rigid panels, flexible panels, and semi-flexible panels.

Rigid panels are surrounded by aluminum and made with sturdy tempered glass. They are resilient against various weather conditions but require flat space to install. 

Semi-flexible panels can be slightly bent to fit the shape of the installation surface. However, they can’t absorb a lot of power. 

One very common type of solar panel used on boats is the flexible panel . Flexible panels are thin and lightweight, and, as their name suggests, they can be added to a wide variety of surfaces. 

Here are the pros of flexible panels: 

• They are thin and light. Flexible panels are approximately one-eighth the weight and size of rigid and semi-flexible panels. This allows you to add them to various sailboat sizes and surfaces. It also reduces the load on your sailboat. 
• They are easy to install. Flexible panels are easy to work with and can be self-installed by following the instructions that come with the panels. Meanwhile, rigid and semi-flexible panels may require expert installations. 
• They’re sturdy. Despite being light, flexible panels can bear a lot of pressure – you can easily walk over them. 

However, there are also some drawbacks to using flexible solar panels: 

• May fly away . As flexible panels are fragile, they can easily be dislodged and fly away, especially in strong winds. 
• Vulnerable to scratches . While flexible panels can bear much weight, they may get scratched more easily. Over time this may affect their functionality. 
• Not easy to reposition. Flexible panels are generally adhered to the surface of a sailboat using a specially prepared adhesive. Because of this, it is challenging to reposition the solar panels when there is a change of season.
• Less efficient. Flexible solar panels don’t convert energy to electricity or rigid panels. It may be harder to power heavy-duty appliances from a flexible solar panel. 

How Many Panels Can I Fit on a Sailboat (Catamaran and Monohull)?

The amount of panels you can fit on your sailboat depends on the size of the panels and the surface space you have available. 

You can fit at least two 400W panels on a Monohull and at least four on a Catamaran around 35ft in length. You will be able to fit 4-8 more solar panels if you add a solar panel bracket at the stern. 

Renogy Flexible Solar Panel 100W

Renogy is a popular solar panel producer that designs high-quality solar panels. The Renogy Flexible Solar Panel is specially designed for marine vehicles, including sailboats. 

Here are the best features of this solar panel: 

• Flexibility . These solar panels are fragile, making them flexible and easy to mount on served surfaces. 
• Easy to install. These are made with high-quality Monocrystalline, allowing them to be easily bent and easy to install. 
• Lightweight. One solar panel weighs only 4 pounds, ensuring that no extra pressure or weight is displaced on your boat. 
• Durability . User reviews have noted that these panels are highly durable and can last you a few years. 
• Users have noted that these panels do not have the best outputs. They also can’t be stacked, which impacts their accessibility. To ensure that these panels can be connected, you may purchase extra extension cords. 

Newpowa Rigid 160W Solar Panel

The Newpowa Right Solar Panel is a new design with a maximum power of 160W. It is weather-resistant and can be used on various surfaces and vehicles. 

Here are the pros of the Newpowa Solar Panel: 

• Weatherproof . The design features of this solar panel ensure that it survives under a range of different weather conditions. It has a heavy-duty frame preventing it from strong wind and waves. Its mainframe has a further layer of protection for the Junction box. 
• Long warranty . Newpowa offers a 25-year transferrable output power warranty. 
• Easy to install . These solar panels are made with mono cells and bypass diodes. Consequently, the solar panels can be immediately unpacked and are ready to install. 
• High wattage. As these solar panels have 160 Watts of power, you need less of them to power all the devices on your boat. 
• If you are planning on buying the Newpowa Solar Panel, you should note that they only make rigid panels. As a result, you may find it to be difficult to install them on curved spaces.

SunPower 110W Flexible Solar Panel

SunPower’s Flexible Solar Panels are made with high-quality materials ensuring durability. They are especially ideal for sailboats as their warranty also covers saltwater damage. 

Here are the standout features of the SunPower 110W Flexible Solar Panel: 

• Flexibility . This solar panel can be bent up to 30 degrees, making it easy to install on various surfaces. 
• Easily portable. These solar panels are incredibly lightweight (4.4 pounds or 2 kilograms) and can be easily uninstalled and transported. 
• Extended warranty . SunPower offers a five-year warranty on power and a two-year warranty on the product. The warranty includes damage caused by saltwater which many other solar panel warranties do not. 
• Some users have noted that the output quality of these solar panels deteriorates over time. However, you can use the extended warranty to address any quality deterioration. 

ECO-WORTHY Rigid 25W Off-Grid Solar Panel

This is a rigid, 25-watt solar panel that is waterproof, making it ideal for your boat. It is highly durable and has inbuilt indicators that highlight the battery’s status. Its low output makes it only suitable for charging phones or smaller electronics.

Here are some notable features of the Eco-Worthy Solar Panel: 

• Ease of use. This solar panel is easy to install and requires no maintenance. 
• Warranty. Eco-Worthy offers one year of warranty on all of its products and free maintenance if needed. 
• USB control. This solar panel is attached to a USB control panel, preventing it from overcharging and getting damaged. 
• Waterproof. All solar panel parts are entirely waterproof and can handle exposure to both saltwater and freshwater. 

Some of the drawbacks to this solar panel include: 

• Low watt absorption. Unlike many of the other solar panels on this list, this one can only absorb up to 25 watts of power at a time. So, it can only power smaller devices like batteries. 
• Instruction manual. Some users have noted that the instructions to set up the Eco-worth solar panel are confusing for beginners. If you have never installed solar panels before, it’s best to call in an expert to help. 

RICH SOLAR 100W Rigid 12V Polycrystalline

This 100W rigid solar panel is designed to absorb energy even in low light conditions. It is easy to install and ideal for marine environments. 

Here’s why you should consider buying Rich Solar Panels: 

• Works well in low light. This solar panel has been tested in various low light conditions, including cloudiness and during sunrise and sunset. It is certified to be able to harvest energy in low light conditions. 
• Extended warranty. Rich Solar Panels offers a 25-year warranty on limited power output and a five-year warranty on quality. 
• Water and weatherproof . The Rich Solar panels have used selective design elements to ensure they are water-resistant. They have high transparency and are made with tempered glass to withstand high winds and water pressure. 
• Cost-effective . These are significantly cost-effective, making it easy to equip your sailboat fully. 
• While solar panels can easily resist strong winds and water, they can be vulnerable to hail. Hail storms can cause dents on the solar panels, which can eventually cause damage. 

Topsolar Flexible 100W Solar Panel

Topsolar provides premium flexible solar panels that are easy to move and install. They are ideal for installing on water vessels like sailboats with waterproof materials. 

Here are some of the pros of choosing the Topsolar Flexible Solar Panel: 

• Flexibility . The arc radius of this solar panel is 16 inches (40 centimeters) and can be bent to fit several curved surfaces allowing your solar panel to harvest the most sun. 
• Efficiency . These solar panels are made with ETFE (ethylene tetrafluoroethylene) materials. They are extremely energy efficient and can rapidly convert energy. 
• Some users have noted that these solar panels don’t have as long a life as other panels. In addition, some panels may only be able to absorb up to 75 watts of power at a time. 

HQST Rigid 100w Monocrystalline Solar Panel

This is a 100-watt solar panel that has been specially designed to perform well in low light. It is made with high-quality materials and is ideal for sailing boats as it is durable even in unfavorable weather conditions. 

Here are the pros of installing the HQST Solar Panel: 

• Durability . These solar panels are designed to withstand strong winds and snowfall. They’re made with tempered glass and aluminum and are resistant to corrosion, ensuring longevity. 
• Testing and warranty. Each solar panel is quality tested before it is distributed. It also comes with a three-year warranty. 
• Easy to install . While these are rigid solar panels, they have pre-drilled holes, making them easier to install. 

WindyNation 100W Solar Panel Complete Off-Grid

As its name suggests, this solar panel is designed for off-the-grid living and is helpful if you need to access power when you’re in the middle of the sea. 

Here is why you should consider the WindyNation Solar Panel: 

• Includes a charge controller. This controller lets you quickly see the amount of power the solar panel has absorbed. 
• High power. Several positive user reviews have indicated that this solar panel is highly efficient in absorbing and converting power. 
• This solar panel is more expensive than many others on the market.

DOKIO 300W 18V Portable Solar Panel Kit

If you are looking for a heavy-duty solar panel, the Dokio Solar Panel Kit is excellent. It can absorb a lot of energy and power a wide range of appliances on your sailboat. 

Here’s why you should consider this solar panel: 

• Versatile and flexible. While this is a rigid solar panel, it can be folded, making it easy to transport and install. 
• High efficiency. This solar panel is highly efficient at converting energy into power. As it absorbs up to 300 watts, you can install just two of these panels to get significant energy. 
• Some users have noted that this solar panel does not work well in low-light conditions. You may want to have a backup solar panel for days when it’s rainy and windy. 

Here are Some of My Favorite Catamaran Cruising Resources

Thank you for reading this article. I hope you found it helpful as you hopefully start your sailing adventures. Here are some resources that I use as a sailor that I hope you’ll also find helpful. These are affiliate links, so if you do decide to use any of them, I’ll earn a commission. But in all honesty, these are the exact things that I use and recommend to everyone, even my own family. Sailboats: If you’re looking for the best boat to suit your needs, I would recommend a catamaran. If you’re interested, I can show you the differences between catamarans and other types of sailboats .

Books:  For getting started, I really like  Cruising catamarans made easy . It is actually a textbook from the American sailing association; it is used to get a cruising catamaran certification. There are some other great books, and I have compiled a list of books about cruising catamarans that you will find useful.

Communication:  Being out on adventures, whether it be sailing or climbing mountains, good communications are essential to being safe. I recommend two things Google fi (incredibly simple cellular data all over the world) and Garmin inreach mini (for text and voice in remote areas without cell coverage)

Sailing courses: Online sailing courses are great for beginners starting out their sailing career; it’s an efficient way of learning the basics of navigation, throttle controls, and maritime safety. I suggest starting with two free courses from NauticEd .

To see all my most up-to-date recommendations,  check out this resource  that I made for you!

Owner of CatamaranFreedom.com. A minimalist that has lived in a caravan in Sweden, 35ft Monohull in the Bahamas, and right now in his self-built Van. He just started the next adventure, to circumnavigate the world on a Catamaran!

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Sailboat Cruising and Lifestyle Magazine.

Sailboat Solar Systems and How-To

Solar on a sailboat goes together like hands and gloves, but sailboat solar systems can be installed in a variety of ways. The solar components themselves create an infinite combination of possibilities for off-grid sailing. Victron Energy chargers, Renogy Panels, Sunpower Yachts, BlueSea Systems, and many more brands have entered the marketplace, and that’s not including the lithium battery companies.

To simplify things, we’ve compiled three sailboat solar systems videos to give you an overview of what’s possible. And to help you decide on your own simple solar panel setup for sailing.

How-To Install Solar Panels on Your Sailboat

This system from Zingaro shows flexible panels summing 300w of power on a 38′ catamaran.

300W Solar System:

• Three 100w solar flexible panels
• 1 MPPT Solar charger controller

View on Amazon >>

100W HQST Flexible Solar Panels $100-$200

20amp Solar Charge Controller by Victron Energy $150-$200

Simple Sunpower Solar System

This simple solar system from The Fosters shows a quick and easy setup with limited space on top of a bimini.

Sunpower Solar Panels are considered by most in the industry as the gold standard. They use the highest-efficiency solar cells and have top-notch build quality. In this simple installation, three 50w panels are just enough to get you started. Plus, it’s the most affordable installation!

150w Starter Solar System

• Three 50w Flexible Solar Panels
• A Single 15amp solar charge controller

50W Sunpower Solar Panels $150-$200

75v/15amp Solar Charge Controller by Victron Energy $100-$124

Off-Grid on a DIY Solar Powered Sailboat

Here’s a special installation that turned a derelict sailboat into an off-grid sailing machine!

Simon has transformed this derelict sailboat into an epic off-grid solar-powered and fossil-fuel-free cruising catamaran. He’s been living aboard and renovating the boat for the past 3.5 years We’re excited to show you the transformation as well as how he plans to propel the boat without the use of diesel or fossil fuels!

5280w Solar System for Electric Powered Catamaran

• 16 Rigid solar panels (330w each)
• 20kwh of Lithium Batteries

240W Rigid Solar Panels $250-$300

200AH Lithium 4d Battery $1200-$1200

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• Digital edition

Best Solar panels for off-grid power and keeping batteries charged

• Phil Sampson
• November 28, 2022

We take a look at 6 of the best solar panels for boats, from folding units to cutting-edge flexible panels

Free power forever? If only it was that simple! Photo: Graham Snook

For many in the boating community, solar panels represent something of a holy grail. They are, after all, the gift that keeps on giving, aren’t they? Free power forever, (or many years anyway), coupled with zero running costs – what could possibly be better than that?

All you have to do to make this dream come true is banish the memory of the purchase price from your mind – something boaters are notoriously adept at doing – and wait for the sun to shine. If only it were that simple…

The fact of the matter is that there are costs associated with solar panels beyond the price of the panels themselves. While some types of panels can be simply laid on the deck, in many cases some form of mount will be required.

Then there’s the wiring to hook them up to your battery, plus any fitment and/or cosmetic work needed to hide the cabling from view. If your panels are to be left connected permanently, you’ll require a regulator too.

This will prevent both overcharging and a reverse flow of power out of the battery after dark. If you do not fit a regulator, a blocking diode can be used to halt the reverse flow instead.

But once all of the above have been overcome – and providing you’ve done your homework to ensure your panels will generate sufficient power to cover your needs – then, yes, it’s a power free for all!

There are many other benefits to boat solar panels too: First and foremost, they work all on their own – solar panels are automatic, so you can just let them get on with the job.

Apart from the occasional wipe over and a wiring check, they’re largely maintenance-free too. Unlike wind generators, (especially like the one with wonky bearings on that boat moored next to you), they don’t make any noise.

And finally, your batteries will be pleased, because keeping them from going flat can extend their life.

Here’s our choice of the best boat solar panels.

6 of the best boat solar panels available right now

Giosolar 1,000W flexible solar panel

Best flexible boat solar panel

Delivering a mighty kilowatt of power, (not far off the amount used by a one bedroom house), this Giostar package comprises ten separate 100W panels, each of which is 1,050 x 540 x 2.5mm in size.

Capable of charging either 12 or 24V batteries, a kit of this magnitude is one for the most serious of solar enthusiasts – Eco Experts reckons 660-990W is sufficient for a liveaboard.

Giostar panels are abrasion resistant, anti-rust and dust proof and their junction boxes are sealed and waterproof. The panels are also light, thin and flexible, and can withstand being bent up to 30 degrees.

Reasons to buy: Incredible amount of power, panels are abrasion resistant as well as anti rust + dust proof

Reasons to avoid: Premium price

Price: £1,464.45

Buy it now on Amazon (UK)

Note: We may earn a commission when you buy through links on our site, at no extra cost to you. This doesn’t affect our editorial independence.

Ecoflow 160w portable solar panel.

Mobisolar 100W foldable solar panel

Best foldable boat solar panel

Mobisolar’s foldable panels are light (4.5kg) and measure 121 x 56.5 x 3 cm when unfolded, with the longest dimension reducing to 60 cm when folded, making them easy to transport.

The panels use advanced technology to provide superior performance, with each panel subjected to a thorough testing routine before and after assembly.

So confident is Mobisolar in its products that the company stands behind its panels with a two-year defect warranty and a five years’ electrical performance warranty.

For maximum flexibility in operation, three USB power outputs are fitted per panel, one delivering 100W, the second 60W and the third 10W.

Reasons to buy: Foldable, lightweight and long warranty

Reasons to avoid: Not resistant to the elements, doesn’t feature mounting holes

Price: £145.00

Buy it now on eBay

Eco-worthy 100W solar panel kit

With 100W panels being ideal for keeping batteries topped up, our second offering in this power class is from Eco-worthy, a major player in the solar panel field.

Competitively priced, our link below is for a kit which includes an LCD control unit and four ‘Z’ brackets in addition to the panel itself.

The Eco-worthy 100W panel is of the monocrystalline type, which means their cells are made from an ingot grown from a single silicon crystal of high purity. It’s also a rigid panel, so this particular product would need to be mounted on a frame or flat surface.

Reasons to buy: Competitively priced, Features LCD panel, brackets

Reasons to avoid: Only a year warranty, not resistant to elements

Price: £113.99

PV Logic 20W Flexi solar panel

Offered by Force 4 Chandlery, this lightweight semi-flexible solar panel comes complete with a dual battery solar charge controller.

The panel is completely waterproof thanks to its six-layer, heavy-duty laminate finish, and should a wayward crew member plod over it in their size 9s the panel’s dimpled top surface is ‘self healing’.

The controller can handle both 12 and 24V systems and the panel’s PWM (Pulse Width Modulation) charging system is efficient and battery-lifetime friendly.

Supplied with LED battery-status indicators and 4 metres of cable, PV Logic Flexi panels can be bonded to flat or curved surfaces.

Reasons to buy: Lightweight, waterproof, dual controller

Reasons to avoid: Lacks mounting options

Price: £149.95

Buy it now on Force 4 Chandlery

Powoxi 10W solar panel

At the budget end of the market comes this Powoxi 10W solar panel charger kit. While you won’t go far on just 10W of power, this kit claims to be capable of charging and maintaining various 12V batteries.

The kit features a fully automatic charging and maintenance controller, which provides intelligent three-level charging and protection against short- and open-circuits, under voltage and overloading.

A reverse flow system is included and the interface is described as ‘plug and play’. While the panel is rainproof, it will not withstand immersion in water, so this is a product to perhaps leave behind on the dock when you take to the water.

Reasons to buy: Great budget option, plug and play

Reasons to avoid: Not waterproof, won’t go far on 10V

Price: £27.59

Eco-worthy 10W/5W solar panel

The least pricey option we could find anywhere, this baby 5W solar panel is simply a trickle charger. But if that’s all you need then look no further, for this is another Eco-worthy product.

The technology in the panel is polycrystalline, so it’s not the most efficient on the market, but for this power that’s hardly a great concern.

The panel is supplied with two charging options; a pair of crocodile clips which attach directly to the battery, and a cigarette lighter plug.

According to the product’s eBay listing, this seller alone has sold approaching 3,000 of these units – and at this price, we can understand why!

Reasons to buy: Incredible price, can be charged via car lighter plug

Reasons to avoid: Small, not very efficient

Price: £9.99

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Adding Solar Power to a Sailboat

• By Emily Fagan
• Updated: October 18, 2019

During our nearly four-year cruise of Mexico, my husband, Mark, and I lived almost exclusively on 555 watts of solar power charging a 640-amp-hour house battery bank. We anchored out virtually every night aboard our 2008 Hunter 44DS, Groovy , and relied on the sun for power. During one 10-week stretch, while we waited for a replacement engine alternator to arrive, our boat’s solar panels were our sole source of power. We had no backup charging system to turn to, and yet we lived and sailed comfortably the entire time. Mounting solar panels on a sailboat was not difficult, but a few key decisions made a huge difference in how effective our panels were.

A solar-power installation on a sailboat is made up of two independent systems: one system to charge the batteries, and another system to provide 120-volt AC power for household appliances. In the charging system, the solar panels convert sunlight into electrical current and deliver it to the batteries via a solar charge controller. Similar to a voltage regulator, the charge controller acts as a gatekeeper to protect the batteries from receiving more current than they need as they are being charged. In the AC power system, an inverter or inverter/charger converts the 12-volt DC power in the battery into 120 volts AC whenever it is turned on.

Panel Positioning and Wiring Considerations

One of the biggest challenges for sailors installing solar power on a sailboat is finding a place on the boat where the panels will be shaded as little as possible. Just a few square inches of shade on one panel can render that panel all but inoperable. Unfortunately, between the mast, radome, spreaders and boom, shadows cross the deck all day long, especially as the boat swings back and forth at anchor.

What’s worse, if the panels are wired in series rather than in parallel, this little bit of shade can shut down the entire solar-panel array. When we installed solar power on Groovy , we had already lived exclusively on solar power in an RV for over two years. Our RV solar panels had been wired in series, and we had witnessed the array shutting down current production when just half of one panel was shaded.

Choosing whether to wire the panels in series or parallel on a boat affects the wire gauge required, which is why many solar-power installers lean toward wiring the panels in series. Panels wired in series can be wired all the way to the solar charge controller with a thinner-gauge wire than those wired in parallel. This is because the voltage of panels wired in series is additive, while the current remains constant, so the current flowing is just that of a single panel. In contrast, the current flowing from panels that are wired in parallel is additive, while the voltage across them is not. This means that in a parallel installation, the current going to the charge controller is several times higher and requires much thicker cable to avoid any voltage loss over the length of the wire.

Not only is thinner-gauge wire less expensive, but it is also more supple and easier to work with, making the job of snaking it in and around various crevices in the boat and connecting it to the solar charge controller much less of a struggle. Thus the choice between series and parallel wiring boils down to a trade-off between system performance, expense and ease of solar system installation.

Luckily, the size of the wire can be reduced if higher-­voltage solar panels are chosen. Since watts are determined by multiplying volts by amps, a higher-voltage panel that generates the same watts as a lower-voltage panel will produce less current. Therefore, selecting nominal 24-volt panels instead of 12-volt panels allows for the use of thinner wire sizes no matter how they are wired.

Our Marine Solar Panel Design Choices

In our installation, we decided to mount three 185-watt, 24-volt (nominal) Kyocera solar panels high above the cockpit, well aft of the boom, as far away as possible from potential shade. Our Hunter came with a big, solid stainless-steel arch, and we turned to Alejandro Ulloa, a brilliant metal fabricator at Baja Naval Boatyard in Ensenada, Mexico, to build a polished stainless-steel solar-panel arch extension onto the existing structure. He designed the arch extension with integrated telescoping davits to hoist our dinghy as well as support the solar panels. These davits were strong enough — and the lines and blocks had enough purchase — that either of us could lift our light Porta-Bote dinghy with its 6-horsepower outboard without a winch.

We spaced the panels about a half-inch apart and wired them in parallel. Using two twin-lead wires, we snaked the three positive leads and one common ground down through the inside of the arch tubes so they wouldn’t be visible, and placed wire loom over the exposed wires under the panels.

The junction points for the three parallel panels were on positive and negative bus bars inside a combiner box, all mounted in a cockpit lazarette. Inside the combiner box, we installed three breakers, one for each panel. This gave us the ability to shut off any or all of the panels if we needed to (we never did).

We mounted a Xantrex solar charge controller (model XW MPPT 60-150) in a hanging locker, as close to the batteries as possible, in a spot where it was easy to monitor and program. We ran twin-lead wire from the combiner box to the charge controller and from there to the batteries.

Our boat came with three new 12-volt Mastervolt 4D AGM house batteries, all wired in parallel, for a total of 480 amp-hours of capacity. We wanted a bigger house battery bank, and because it is best for the age, type and size of the batteries to be matched, we added a fourth new Mastervolt 4D AGM house battery, which brought our total to 640 amp-hours. Our batteries were installed at the lowest point in the hull, below the floorboards, and they ran the length of the saloon, from just forward of the companionway stairs to just aft of the V-berth stateroom door.

The best way to charge a bank of batteries that are wired in parallel is to span the entire battery bank with the leads coming from the charge controller. We did this by connecting the positive lead from the charge controller to the positive terminal of the first battery in the bank, and the negative lead from the charge controller to the negative terminal of the last battery. By spanning the entire bank, the batteries were charged equally rather than having the charging current focused on just the first battery in the bank.

We feel that AGM batteries are superior to wet cell (flooded) batteries because they can be installed in any orientation, don’t require maintenance, can’t spill (even in a capsize), and charge more quickly. Our Mastervolt batteries, like almost all AGM batteries on the market, are dual-purpose, combining the very different characteristics of both deep-cycle and start batteries. Our batteries work well, but if we were doing an installation from scratch today, we would consider the new Trojan Reliant AGM batteries. These batteries are engineered strictly for deep-cycle use and have been optimized to provide consistent current and maximize battery life.

Our boat came with a Xantrex Freedom 2,500-watt inverter/charger wired into the boat’s AC wiring system with a transfer switch. The inverter/charger performed two functions. While the boat was disconnected from shore power, it converted the batteries’ 12-volt DC power into 120-volt AC power, allowing us to operate 120-volt appliances, like our microwave. When the boat was connected to shore power, it charged the batteries.

Because this inverter/charger was a modified-sine-wave inverter, mimicking AC ­current with a stair-stepped square wave, we also had a 600-watt pure-sine-wave inverter to power our potentially more sensitive electronic devices. We chose Exeltech because its inverters produce an electrical signal that is clean enough to power medical equipment, and they are NASA’s choice for both the Russian and American sides of the International Space Station. For simplicity, rather than wiring the inverter into the cabin’s AC wiring, we plugged ordinary household power strips into the AC outlets on the inverter and plugged our appliances into the power strips. Like the charge controller, the inverter must be located as close to the batteries as possible. Ours was under a settee.

Shade’s Impact on Sailboat Solar Panels

Once our solar installation was completed on our sailboat, we closely observed the effects of shade on our solar-panel array. We were often anchored in an orientation that put the panels in full sun. Just as often, however, we were angled in such a way that shade from the mast and boom covered portions of our panels. It was fascinating to monitor the solar charge controller’s LCD display whenever the sun was forward of the beam — the current from the panels to the batteries fluctuated up and down as we swung at anchor.

Taking notes one morning, we noticed that the charging current was repeatedly creeping up and down between 9.5 and 24.5 amps as the boat moved to and fro. When the entire solar-panel array was in full sun, it generated 24.5 amps of current. When we moved so the mast shaded a portion of one panel, the array generated 15 amps. When it shaded portions of two panels and only one was in full sun, the array produced just 9.5 amps. Of course, it would have been preferable to see a steady 24.5 amps all morning, but this sure beat watching the current drop to zero whenever a shadow crossed a panel.

We discovered that shade makes a huge impact while sailing, too. Surprisingly, it is far worse to have the panels shaded by the sails than to have the panels in full sun but tilted away from its direct rays. One afternoon, we noticed that while we were on a tack that tilted the panels away from the sun, they generated 24.5 amps of current, whereas on a tack where the panels were tilted toward the sun but two of the three were partially shaded by the sails, the current dropped to a mere 10 amps.

Reflections On Our Solar Panel Installation

A wonderful and surprising side benefit of our large solar panels and arch system was that the setup created fabulous shade over the jumpseats at the stern end of the cockpit. Our metal fabricator, Alejandro, placed a support strut at hand-holding height, and sitting in those seats feels secure and comfortable while sailing, no matter the conditions.

After living on solar power for eight years of cruising and land-yacht travel, we’ve learned that you can never have too much solar power. Groovy’s 555 watts was enough to run all our household appliances as needed, including our nearly 4-cubic-foot DC refrigerator, two laptops, a TV/DVD player, and lights at night. However, it was not quite enough power to run all that plus our stand-alone 2.5-cubic-foot DC freezer during the short days and low sun angles of the winter months without supplemental charging from the engine alternator every few days. For the 10 weeks that we did not have a functioning alternator, our solution was to turn off the freezer, which enabled our batteries to reach full charge every afternoon.

Solar power made a world of difference in our cruise. Not only did it allow us to live comfortably and with ample electricity for weeks on end when our engine alternator went on the blink, but as a “set-it-and-forget-it” system, it also gave us the freedom to anchor out for as long as we wished without worrying about the batteries. In our eyes, the solar-panel arch enhanced the beauty and lines of our boat, giving her a sleek and clean appearance. It was true icing on the cake to discover that the panels and arch system also provided much-needed shade over the cockpit and helm from the hot tropical sunshine. If you are preparing for a cruise, consider turning to the sun for electricity and outfitting your sailboat with solar power.

The Installation:

Emily and Mark Fagan offer cruising tips and share their stories and photos on their website, roadslesstraveled.us . They are currently enjoying a land cruise across America aboard an RV.

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Choosing the Best Marine Solar Panels for Your Boat

There’s nothing like kicking back and relaxing in a boat all to yourself. But while sailing the waves and soaking in the sun is an awesome getaway, you’ll still need to think about how to generate electricity while on board, especially for running your boat battery.

Get free power through solar energy with the best marine solar panels. Not only are they easy to set up and use, but you also save money by relying on renewable energy instead of paying expensive electricity bills like usual.

But how do you look for the most suitable solar panels for boats if there are dozens of solar panel types out there? Well, you’ve come to the right marine solar panels review. There are three key things you need to keep your eyes out for when choosing marine solar panel kits for your beloved boat.

• Waterproof: Since you’ll be traveling across bodies of water, you have to anticipate that your solar panels could get wet. Make sure your solar panels are resilient against water damage through waterproof designs.
• Flexible: Boats have curved surfaces, unlike roofs that are flat and can do with rigid panels. Marine solar panels can be straight and conventional, but it would be a big help if they were flexible so that you can mount them on tricky surfaces on your boat. Flexible solar panels hug irregular surfaces, ensuring they don’t topple over as your boat moves.
• Thin: Boats are small spaces as it is. You don’t need bulky, rigid panels occupying more space than necessary. Go for ones that are about an inch or so thick. Thinner solar panels are sleek and don’t take up too much space, so they’re a must for marine solar solutions.

There are many other factors you need to consider when looking through boat solar panels for sale. Check out the rest of the important factors in our buying guide below.

Need more help picking out a good boat solar panel kit? Look through this rundown of solar panels for boats reviews to see some of the most popular options.

Best Overall

Renogy Monocrystalline Solar Panel

Premium Choice

Topsolar Solar Panel

Editor’s Pick

ECO-WORTHY Solar Panel

Table of Contents

1. Renogy 100W 12V Monocrystalline Solar Panel

2. topsolar 20-watt monocrystalline solar panel, 3. eco-worthy 25w off-grid solar panel, 4. renogy extremely flexible solar panel, 5. suner power 30w polycrystalline solar panel, 6. newpowa monocrystalline 100-watt solar panel, 7. rich solar polycrystalline solar panel, 8. topsolar 100-watt 12-volt solar panel kit, 9. newpowa monocrystalline 30-watt solar panel, what to look for when looking through marine solar panel options, how many solar panels do i need to run a boat, how many amps does a marine refrigerator use, how do you install solar panels on a boat, top-rated marine solar panel reviews.

• Material: Monocrystalline
• Wattage: 100W
• Voltage: 12V

This solar panel kit by Renogy is awesome because it’s an all-in-one solar system. It includes all the necessary cables and accessories to get the show on the road.

The convenient kit includes a 100-watt solar panel, the Wanderer 30A PWM controller, and connectors and adapters. It even has Z brackets for mounting your solar panel. I like that I didn’t have to purchase all these separately.

I like that the Wanderer charge controller is negative ground, which means it prevents any overcharging and short-circuiting issues with our batteries.

Now, for the solar panel itself, I appreciated how the frame was made of sturdy, high-quality, corrosion-resistant aluminum, making the panel extra durable.

Its monocrystalline solar cells can convert 21% of the solar power to free energy you can use on your boat. That’s pretty high compared to other solar panels.

Plus, the production power of this solar panel kit is quiet, so it won’t bother you when you need silence.

• Includes the necessary connectors, controller, and mounting brackets
• The negative ground controller stops overcharging and short circuits
• The solar panel has a durable, corrosion-resistant aluminum frame
• Monocrystalline cells convert 21% of solar power into free energy for you
• Power production is quiet, so it will never disturb users
• The charge controller has no LCD screen
• Wattage: 20W

This Topsolar solar panel kit is another one that offers a lot of accessories. It comes with a charge controller, some alligator clips to hold your cables and connectors properly, and even an O-ring terminal.

The solar panel itself is made of thick, high-class tempered glass to protect the cells inside. It’s framed with aluminum for extra sturdiness as well. I love that it’s made of such premium materials, so I never have to worry about it being too flimsy or break apart easily.

All in all, the solar panel weighs a mere 4.8 lbs, making it easy to carry around. It’s lightweight enough for effortless lifting and transporting when I’m about to install it or move it to another area.

This marine solar panel is resistant to harsh weather, thanks to its maximum static load of 2,400 Pa. Because of this, you can use it worry-free, even in inclement climates.

There are pre-drilled holes at the back of the panel to make it easier to set up with screws and grommets.

• Comes with a charge controller, alligator clips, and O-ring terminal
• The panel is made of tempered glass and an aluminum framing
• Weighs only 4.8 lbs, so it’s easy to lift and carry around
• Resistant to harsh weather like wind or snow
• Has pre-drilled holes at the back to make set-up easier
• Doesn’t include mounting brackets
• Material: Polycrystalline
• Wattage: 25W

A long lifespan is one of the top factors I consider when looking for a marine solar panel. This one by ECO-WORTHY ticks off that box because it is built to last.

It’s made with highly efficient cells to give me adequate power output. The framing is designed with aluminum to make it sturdy, increasing its longevity.

This off-grid solar panel kit comes with a convenient charge controller. Its interface may not have a modern display screen, but it does have light indicators that update in real-time so you can tell how far your charge is coming along. It also has a USB port to let you charge your phones and other small devices.

The solar panel set comes with SAE connector cables to help users set up. They’re quite long and stretch to 9.84 feet, giving us maximum flexibility for moving our panel and charge controller around.

ECO-WORTHY offers a one-year warranty for this kit. You’ll also have access to the brand’s 24/7 hotline in case you have questions or concerns with your solar panel.

• Made with high-efficiency solar cells and aluminum for longevity
• Charge controller has power indicators that update in real-time
• There’s a USB port on the charge controller for small devices
• The SAE connector cables are quite long at 9.84 feet
• A one-year warranty with 24/7 technical support from ECO-WORTHY
• One 25W solar panel might not be enough to power multiple appliances

Setting up solar panels on curved surfaces is tough, but with these Renogy flexible solar panels for boats, it’s never a challenge.

These flexible solar panels bend to a 248-degree arc, which is a lot more flexible than other bendable panels. This is excellent for boat and yacht decks that are curved.

The panels are made of monocrystalline cells that emit 100 watts, ensuring a strong and reliable power supply for our consumption.

Transporting and setting up these flexible solar panels is a walk in the park, thanks to its lightweight and super thin design. They’re never bulky and retain the smooth silhouette of your boat.

They’re thin and light because they’re designed with advanced polymer, which is 70% lighter than other materials traditionally used to build solar panels.

These flexible panels are made to withstand bad weather. They resist impact and don’t get damaged in heavy loads of rain. You’ll find that they even tolerate up to 5,400Pa of snow.

• Bends to a 248-degree arc to fit irregular and curved surfaces and decks
• Monocrystalline panels emit a consistent 100 watts
• Super lightweight and ultra-thin, making it a breeze to transport
• Made with advanced polymer that is 70% lighter than traditional materials
• Resists impact and damage from heavy loads of rain and snow
• The cables in the solar panel kit aren’t the same length

These solar panels by SUNER POWER are built with high-efficiency polycrystalline cells, giving me great performance even with the small energy output. They emit up to 30 watts of power to use as free energy on the boat.

This kit charges our batteries safely. It goes through a strict three-step intelligent algorithm to make sure our battery doesn’t go through overheating and short-circuiting, so I know I’m extra safe.

You’ll also find bright LED lights on the charge controller that indicate how the charge is coming for easy monitoring. It’s a convenient way to make sure our charging is right on track even when we’re doing other errands on the boat.

Tough weather conditions are nothing when it comes to this marine solar panel. It’s built with IP65 waterproof technology, so I don’t have to worry about the climate damaging my solar panel kit. It can even resist erosion, rusting, and damage from the sun’s UV rays.

• Polycrystalline cells emit 30 watts of power to use as free energy
• Charges our battery safely with an intelligent three-step algorithm
• Has bright LED light indicators so you can see how your charging is going
• Withstands tough weather because of IP65 waterproof technology
• Resists erosion, rusting, and UV damage in finicky weather
• The wires could be longer

This Newpowa monocrystalline panel is smaller in size compared to most other panels. It comes up to about 45 x 20 inches, making it more manageable than bigger ones.

It’s made of monocrystalline cells that are highly efficient in turning power from the sun into free energy for our consumption and charging.

The panel’s aluminum framing prevents any corrosion, which extends the lifespan of the solar panel kit. That means I won’t have to constantly replace it.

The marine solar panel and some of its accessories are made to be waterproof. That way, they’ll survive even the most horrible weather conditions as you sail.

Venturing to areas and cities without much bright sunlight is no problem for this marine solar panel kit. The junction box is equipped with bypass diodes that ensure users don’t get any power outages even in cloudy, shaded areas.

• Smaller in size and more manageable than other solar panels
• The monocrystalline panels are efficient in converting power into energy
• Aluminum framing prevents corrosion, extending the solar panel’s life
• These monocrystalline solar panels can survive horrible weather
• Junction box has diodes to let your power work even in low-light areas
• You don’t get the rated 100-watt output every single day

This RICH SOLAR panel is one of my favorites for travelling. I love it because it allows for more sunlight absorption. The panels’ anti-reflective, high-transmission film also helps make energy conversion more efficient.

Because of these factors, this panel works extremely well even in areas that are low in sunlight . So when I know I’m going to be sailing to cloudy shores, I make sure to bring this panel along.

This set uses quick-connect cables that don’t take more than a few seconds to fix up. It makes installation fast and easy even for beginners.

There are also about 14 holes on the panel so that you can simply screw it onto your mount. That means you can set it up without the complication of drilling the holes yourself. The design is also compatible with a variety of mounts, further adding to user’s convenience.

• Its anti-reflective panels are high-transmission for even more efficiency
• High conversion efficiency even in areas without bright sunlight
• Uses quick-connect cables, so setting up is fast and easy even for beginners
• There are 14 pre-drilled holes on the panel for quick installation
• Works with many types of mounts
• Doesn’t include mounting brackets, so you have to purchase some

This solar panel by Topsolar emits 100 watts of power to charge any 12-volt battery while you’re on the go. It’s perfect for cars, RVs, and a huge range of off-grid uses, but it works excellently for boats too.

The panel is made with monocrystalline cells, protected by a coating of high-quality tempered glass. This protective layer also prevents wear-and-tear in the long term. Meanwhile, anodized aluminum frames the panel, protecting the edges from corrosion.

You get a V-shaped bracket along with your panel in this kit. This bracket allows users to tilt the panel in whatever direction they desire. It’s very helpful when we’re trying to position the panel to face the sunlight directly.

The charge controller this solar panel comes with is made with IP67-rated waterproof technology. This means it prevents any water damage from ruining our solar system.

• Charges any standard 12-volt battery while you’re on the go
• A wide range of uses
• The mono cells are protected with wear-resistant tempered glass
• The framing is made of anodized aluminum to protect the panel’s edges
• Comes with a V-shaped bracket to tilt the panel in the direction of the sun
• The charge controller is made with IP67 technology to avoid water damage
• The panel is quite heavy at almost 16 lbs, making it heavy to carry

This Newpowa panel emits 30 watts of power. That may sound small to some people, but it’s perfect for charging small devices and running just a few appliances on a short boat ride.

It’s made with high-efficiency monocrystalline cells. These cells allow for a more compact panel design that is smaller and more manageable than the brand’s polycrystalline panels.

Multiple layers of the panel protect its cells. This includes an ethylene-vinyl-acetate encapsulation, iron tempered glass, and even a TPT back sheet that can help with heat dissipation.

There are wires already pre-attached to the panel, one at 3 ft and another at 1 ft. Both of these have Anderson connectors as well, so users don’t have to fuss about setting them up themselves.

The panel also has holes pre-drilled in them, so it’s ready to be screwed into your mount or bracket of choice.

• Provides 30 watts of power, perfect for small devices and short trips
• Made with high-efficiency mono cells that allow for a compact design
• Cells are protected by multiple layers, like tempered glass and TPT backing
• The wires and connectors are pre-attached, which is great for beginners
• Comes with mounting holes already drilled on the back of the panel
• The solar panel isn’t weatherproof, so you can only use it on sunny days

HQST 100W 12V Solar Panel (Outdated)

This 100-watt solar panel by HQST is designed for efficiency and durability. The panel itself is anti-reflective, thanks to thick and durable tempered glass. It’s also lined with aluminum in its framing, which resists corrosion and damage to the panel’s edges.

Polycrystalline solar panels like this one are made with high-efficiency cells that convert more power into energy than the usual panel. They also contain diodes to bypass any power outages or drops when your boat travels into a shaded area.

This kit’s junction box is rated IP65, which means it’s waterproof. That way, it can resist damage from water jets and uncontrollable weather.

Installation is a breeze with the pre-drilled holes at the back of this panel. It’s perfect for newbies that don’t want to call in a professional to set it up.

• The anti-reflective panel is made with sturdy tempered glass
• An aluminum frame
• Polycrystalline panels efficiently convert the sun’s energy into power
• Contains diodes to bypass power outages when you go into low-light areas
• The junction box is rated IP65 to resist damage from undesirable weather
• Comes with holes drilled at the back of the solar panel for easy mounting
• The wires on the panel are quite short

WindyNation 100W Off-Grid Solar Panel (Outdated)

I love that this solar panel by WindyNation gives off a consistent 100 watts of power, provided that the panels are positioned directly under the sun. That makes it an ultra-reliable panel that isn’t flip-floppy when powering our devices.

The solar system comes with many accessories you’ll need to set up and use your panel. There’s a quality charge controller, some mounting brackets, and all the necessary cables needed.

My favorite part about this system is the charge controller. It has a high-quality LCD screen that displays all the information I need to see about my battery as it charges. It even has a sensor to help me monitor the battery’s temperature.

I can also choose and adjust what information settings are shown on the screen, depending on my preference. Buyers can get whatever information they’d like to know—amperage, amp-hours, temperatures, voltage, and more!

• Consistently provides 100 watts of power when positioned under the sun
• Comes with a charge controller, mounting brackets, and cables
• The charge controller has an LCD screen
• Sensor for battery temperature
• You can choose and adjust what settings to see on your LCD screen
• You must purchase fuses and fuse holders to complete this solar system

SUNER POWER 12-Volt Waterproof Solar Panel (Outdated)

This solar panel by SUNER POWER doubles as a battery charger. It’s powered by highly efficient polycrystalline cells on a sturdy solar panel. These solar cells generate battery power in any condition, even when the sun isn’t so bright.

The charging system follows a stringent and smart three-step algorithm, keeping your battery safe as it charges. It does so with a unique “Maximum Power Point Tracking” (MPPT) chip, which prevents battery issues like overcharging and short-circuiting. MPPT also allows the charge controller to generate up to 30% more power than others do.

The controller has a LED light where you can see all the pertinent information on your battery, like whether it’s charging and if the battery’s full.

This entire solar system is made with IP65 waterproof technology. It won’t be susceptible to water damage, so users don’t have to worry about backflow from the water around the boat causing damage to it.

• High-efficiency polycrystalline solar cells generate power in any condition
• Has a smart three-step charging algorithm for a safer charge
• Its unique MPPT chip protects your battery
• MPPT controller generates up to 30% more solar power than others
• Has a LED light to indicate battery status
• The system is IP65 waterproof, so it won’t be susceptible to water damage
• Designed to work only on 12V batteries

Easy to install through grommets or adhesives

Setting up traditional solar panels on regular surfaces like walls and roofs can be difficult as it is. It might be trickier on a moving, swaying boat.

Make sure your marine solar panels are a breeze to set up. Look for ones that are okay to simply stick onto surfaces with adhesives, or have pre-drilled holes so you can screw them onto a mount quickly.

Provides an adequate amount of energy to power up your batteries and appliances

Select marine solar panels that will give you the right amount of solar power to meet your energy requirements.

For example, if you only need solar power on the boat to charge devices in the short term, 50W or 100W might be enough for your trip.

However, if you intend to use your solar panel to charge marine battery, you’ll definitely need one that converts a higher amount of solar energy—perhaps some 200 watt marine solar panels.

Comes with all the necessary accessories, like connectors and junction boxes

Don’t put yourself through the hassle of buying each part of your marine solar system separately. Look for solar panels that provide all the necessary cables, boxes, and accessories to get you set up immediately. Ensure that your panel comes with connectors, junction boxes, charge controllers, and more.

Manufactured by a legitimate and respectable solar power brand

You must always purchase solar panels from legitimate brands that will give you top-notch and high-quality panels. There are many bogus panels in the market today, so double-check to make sure the solar panels you’re buying come from good, renowned manufacturers

If you’re not sure which solar panels to buy, it’s wise to go for classic, tried-and-tested brands. These include Renogy, TP-Solar, and SunPower marine solar panels.

Plus, buying from bigger brands will increase your chances of getting a product warranty that lasts years.

It depends on how much power you need to keep your appliances and gadgets up and running.

For shorter, one-day excursions, you can live with just one or two high-quality solar panels to provide some electricity to charge your phones and maybe a mini-fridge for the day.

But if you’re planning to sail for longer and live on the boat 24/7, you’ll probably need a bigger boat solar system with as many solar panels as you need. This is because you’ll likely have to run bigger appliances and lights, which demands more solar energy.

If you have a 12V marine refrigerator, it will likely only use up anywhere between 2-6 amps per hour. One solar panel emitting a usual 100 watts is more than enough power for such a fridge.

There are many different ways to set up solar panels on boats. If your solar panel is flexible, thin, and ultra-light, you can simply secure it in place with adhesives.

Thicker panels may need to be screwed in with grommets. If this is the route you’re going for, make sure you have sturdy mounting hardware to place your solar panels in.

Traveling through water may be relaxing and stylish, but the excursion is never complete without the best marine solar panels to provide solar energy and battery power during your trip. Hopefully, this round-up of traditional and flexible marine solar panels reviews help you out on your hunt to find the best panels.

Just make sure your panels are efficient in providing high power, waterproof to avoid damage from the sea, and thin and lightweight for easy mounting and storing. If you tick all those boxes, your sailboat solar panels should be all good.

I am Kathleen Miller, staff writer and reviewer of the Avasolar team. Working with the team has been a pleasure for me so far, I hope to bring readers useful information by creating detailed and easy-to-follow contents.

Updated 2 months ago

Everything you need to know about installing solar panels on boats

Written by Ana Almerini

Find out what solar panels cost in your area

Solar panels built specifically for use on boats are a great option as a source of backup power when you’re out on the water. Solar panels act as a way to recharge the boat's batteries and keep your appliances running, all without needing to buy gas for a noisy gas-powered generator.  

Marine solar panels are a relatively niche market, but there are plenty of options to choose from since typically, you can install any DIY off-grid solar panel on your boat. 

Our favorite solar panels for boats are:

Topsolar flexible solar panel

Renogy 100W 12V solar panel

SunPower 170W solar panel

Below, we get into the best solar panels to buy for your boat depending on your needs, how to determine which size you will need, and why utilizing solar power for your boat is a smart idea.

Key takeaways

Solar panels on your boat maintain your battery’s charge to ensure that your appliances always have power, without a loud and expensive gas generator.

An average 30-foot boat will need about 350 watts of solar power to maintain electricity.

To determine how many panels your boat needs, you need to figure out how much power it uses, which you can easily do with a battery monitor. It also depends on how big your boat’s battery is.

You can install solar panels in unique locations on your boat but it is important that they can track the sun’s movement throughout the day.

What is the best use for boat solar panels?

Boats use a lot of energy for things like maintaining autopilot, keeping navigation lights on, and powering radio systems. Solar panels can provide the energy to carry out these tasks and maintain your boat's battery if it happens to be sitting idle. In either circumstance, your battery will never run out of energy. 

Not to mention, compared to gas-powered generators, solar panels have the added benefit of being quiet. They also don’t produce excess heat that makes sitting in your boat with a gas generator unpleasant on hot days.

You can use solar panels for any size boat. For smaller sailboats, the main job of your solar panels would be to keep the battery fully charged for your boat’s electricity. For larger boats, they help reduce or eliminate the need to use the engine to provide excess power. 

The average 30-foot boat would require about 300-350 watts of power . Depending on your energy use and boat size, you need more or less solar power to provide you with electricity.  

How to choose the right solar panels for your boat

The first step to determining what size solar panel will work for your boat is figuring out how much power your boat is using . You can do this by checking the labels on your appliances for the typical amp hours and volts used.

Or, you can use a battery monitor to measure the amount of energy your fridge, lights, or the other appliances on your boat consume while in use. After finding the amp hours your boat uses per day, you can determine the wattage of power your solar panels need to produce. 

This example is extremely limited, you will need to determine how much energy your entire boat is using to make sure your panels provide enough power to keep your battery charged. But, technically if you had one 300-watt solar panel, or (3) 100W solar panels, they would generate 2,800W over those 8 hours. That energy would be more than enough to keep the above appliances running. 

The size of your boat’s battery will also factor into which size solar panel you need . For instance, many DIY solar panels are meant to act as a battery charger to a 12-volt lithium battery, which is the typical size within a boat. But if you have a larger boat with a larger battery, you might need more than 350 watts of power. 

Additional things to consider are whether you will need a charge controller and if you have enough unshaded space for your solar panels to absorb the maximum amount of sunlight. 

Do you need a charge controller? 

A charge controller acts as a regulator for the amount of energy that is transferred from your solar panel into your boat’s battery. This helps to make sure that your battery is not overloaded and overcharged, which can ruin the battery over time. 

While it is not necessary, it is a good idea to install a charge controller with your solar panel system to help manage the energy load that your battery receives. This will prolong the life of your battery while ensuring your boat uses the exact amount of energy it needs. 

Do you have enough space for boat solar panels?

Having a dedicated spot on your boat that has access to the full sun is key. Any shading, such as from a sail on your boat, will reduce the amount of energy your panels produce. While simply bringing portable solar panels aboard is an option, permanently mounting the panels to your boat makes it easier to always have your panels ready to go. 

Because boats typically only have room for a small solar system, getting the most out of your limited space is key. With limited space, it’s best to look for high efficiency panels because you will need less of them to produce the energy you need.

Learn more : What are the most efficient solar panels in 2022?

Or something as simple as the setup below can power your boat's battery and be angled towards direct sunlight throughout the day while not taking up valuable space on the boat.  

What are the best solar panels for boats to buy?

Any type of panel can be used on a boat such as monocrystalline, polycrystalline or thin-film. However, it is important to note that some companies exclude salt water and marine environments from their warranties. 

We've listed some options below, you can choose based on where you have space to put the panels. For instance, thin-film panels are less efficient but they are flexible. So if you wanted to place a few panels on your boat’s roof versus one panel taking up valuable space, thin-film panels would be a good choice. 

On the other hand, monocrystalline and polycrystalline panels have higher efficiency ratings and will ensure you get the most energy from your limited space or during low-light conditions. So if you have a location that can support racking, monocrystalline or polycrystalline solar panels are a better option. 

Below are some of our top picks for solar panels for boats:

Most practical 

Topsolar flexible solar panel 

Cost : $149.99 Buy Now

The Topsolar 100W flexible solar panel is a practical, semi-flexible, cheap option. It does not come with a charge controller or an inverter but you can buy a few of these to create a simple solar panel system on your boat.  

This flexible panel also allows you to utilize more space since this can be molded to fit untraditional angels on your boat. 

Best quality, small cost 

Renogy 100W 12V solar panel 

Cost : $103.44 Buy Now

The Renogy 100W 12V solar panel is a great option. At 21%, it is a high efficiency monocrystalline panel manufactured by a reputable solar panel company.

There are pre-drilled holes for easy drilling to a mount on your boat. If you have space to secure solar panels to a mount, the Renogy panels will help you maximize energy output.

Best overall 

Cost : $399.00 Buy Now

The SunPower 170W panel is a great flexible solar panel for off-grid use. Choose this option if you are interested in the versatility that a flexible solar panel offers and also want a reputable brand name with a high efficiency rating. 

While these panels do not come with a solar charge controller, they must be used with one, so add one to your cart like the Victron Energy SmartSolar MPPT charge controller . 

Why solar panels are a good choice for backup power on boats

Having a source of backup power on a boat is very important, you do not want to be caught far from land with a dead battery. Solar energy is the perfect choice because on a typical boating day, there is ample sunlight available as renewable energy. Because boats rely on a battery for electricity, a solar panel can ensure that this battery always has power. 

There are many solar panel options available for your boat and can easily be installed DIY. They will help with your sense of security while saving money because you can skip out on the traditional gas generator and rely on a self-sufficient solar power system. 

Ana is the Marketing & Communications Manager at SolarReviews, working within the solar industry since 2020. With a Master's in Climate and Society and professional experience in marketing, she helps communicate the value of solar to homeowners and build awareness of the SolarReviews brand. On weekends you can find her at the Jersey shore, reading a book from the ever-increasing stack on her side table, or eating food someone else cooked....

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Shining a Light on the 8 Best Marine Solar Panels

The late great Lou Reed once sang that electricity came from other planets. And he wasn't far wrong, as electricity comes from the sun by the magic of solar power .

The best marine solar panels for boats free you to travel the seas, safe in the knowledge that as long as the sun shines, there's an endless supply of energy. I speak from experience, having fitted 600 watts of solar panels to my canal barge .

It means that for almost eight or nine months of the year, barring really overcast days, I can get all the power I need to liveaboard without the need to run my engine. The ocean is one place where you can guarantee no obstructions from the sun, so it's no wonder that solar power is a top energy choice for sailors.

Why Get Solar Panels?

In the world are two types of boaters: the liveaboard boater and the weekend or holiday leisure boater. Both will benefit from solar but in different ways.

The energy requirements for a liveaboard boater are vastly different from a leisure boater. Managing daily energy consumption is a skill, and having solar means that you worry a little bit less about your batteries .

For a liveaboard boat, the best marine solar panels will be more substantial, probably a minimum of 100 watts. Most liveaboard boats run with two or three panels , giving them a maximum of 300 watts .

That's more than enough power to run a fridge, onboard equipment and laptops while in the middle of the ocean.

For leisure boaters, their energy requirements are far less crucial. Sure, they want the same benefits, primarily, but there's no demand for constant solar because the vessel gets used on an ad-hoc basis. 

It means that there's less need to fill the roof of the boat with masses of panels, unlike the liveaboard vessel.

Care and Maintenance

Solar panels are as easy to clean as your windows. Simply use a hose  and nozzle to rinse away dirt and grime and then wipe with a squeegee . If there's a buildup of debris, use a soft scrub brush and a cleanser such as boat soap  to gently scrub.

Featured Boat Care Product

Check Price on Amazon - Better Boat's chamois towel is scratch and lift-free as well as durable, soft and absorbent. It's the perfect way to keep your boat, RV or car clean, dry and shiny. 

Different Types of Marine Solar Panels

Okay, so you've thought long and hard and have reached the momentous decision to get solar panels. But what are your options? Let's review your solar power choices for boats.

Flexible Solar Panels

Flexible panels are great because they adapt to whatever surface you wish to attach them. They flex, which means you can attach them to surfaces that are not perfectly smooth or flat.

Given the unusual shapes and angles you find on ocean-going boats, this is an advantage.

Also, these types of panels are more robust, meaning they should easily stand up to the rigors of daily sailing life.

Advantages of Flexible Solar Panels

• Fit to most surface shapes
• Don't need large amounts of space
• Ideal for sea-travel
• More robust
• Fixed location means they cannot adapt to the conditions
• Cannot be angled for better efficiency
• Lower percentage conversion of sunlight to electricity

Fixed Solar Panels

Fixed solar panels are often attached to mounts that allow you to swivel and adjust the panel's angle toward the sun. This process generates more energy than the flexible panels would because all they do is sit in a fixed position, relying on the sun's rays hitting the panel.

Solar will indeed operate in average daylight, but if you want the best performance, consider angling the panels.

Generally, fixed panels are more expensive to buy and need more significant maintenance and care. They aren't as robust as their flexible counterparts and are also more awkward to mount.

Advantages of Fixed Solar Panels

• Can be angled to increase efficiency
• Higher percentage efficiency of sunlight to electricity
• Need fewer panels
• Can be mounted to most surfaces
• Generally more expensive than flexible panels
• Need more maintenance and care
• Less robust

Monocrystalline Solar Panels

A silicone crystal "seed" is placed in a vat of molten silicon and slowly drawn upwards, as the silicon clings to the surface of the seed. Imagine a snowball gathering snow as it rolls, and you'll understand.

This process forms an ingot, which is removed from the vat and left to cool. It's then sliced into wafer-thin pieces to develop the cells. It's an incredibly wasteful process, as most of the silicon gets discarded.

The advantage of a monocrystalline panel is that they're the most efficient variety, with some of the latest panels converting 22% of sunlight into electricity.

Because of their high productivity, they're also space-efficient. Fewer panels are needed, making them ideal for the limited roof space on boats.

They also have a longer lifespan, which is why manufacturers place 25-year guarantees on them. They perform better in warmer weather, so if you're sailing around the sunnier climes , these panels would be ideal.

Advantages of Monocrystalline Solar Panels

• Most efficient of all the solar panels
• Higher productivity means fewer panels to mount
• Typically have a 25-year guarantee
• Perform better in warmer climates
• Wasteful manufacturing process
• Generally more expensive to buy
• Less robust than other solar panels

Polycrystalline Solar Panels

The manufacturing process for producing polycrystalline panels is very similar to the monocrystalline versions. A crystal silicone "seed" is immersed into a vat of molten silicon and starts to form an ingot.

Unlike the previous method of drawing the silicone to the surface and removing it from the container to cool, creating polycrystalline cells, the molten silicone is allowed to cool with the silicone "seed" in situ.

Thought to be slightly less efficient than the monocrystalline versions, polycrystalline panels are cheaper to produce, making them the recent panel of choice. They also create less waste, which is better for the environment, and have a lower heat tolerance than monocrystalline panels. 

Advantages of Polycrystalline Solar Panels

• Cheaper to produce
• Less wasteful construction process than monocrystalline panels
• More affordable
• Better in colder climates
• Not as efficient as other solar panels
• Less effective in warmer weather

Thin Film Solar Panels

Thin film panels are produced by placing a photovoltaic substance like amorphous silicon or cadmium telluride onto a solid surface like glass to form the cells.

It produces less waste than traditional solar panel construction, and the cost savings is passed on to the consumer, meaning this is the cheapest option for those on a budget.

They also perform better in low-light and in cloudier days, whereas mono and poly panels will still work in those conditions, but need direct sunlight to reach their maximum performance.

The disadvantage of these panels is their efficiency when compared to monocrystalline panels, which have four times the performance. That means you're going to need more panels and more space to produce the same energy.

Plus, they degrade faster than the other two varieties, meaning that they come with shorter warranties.

Advantages of Thin Film Solar Panels

• Cheapest of all the panel varieties
• Perform better in low-light conditions
• The least wasteful manufacturing process
• Can be adapted to be flexible
• Four times less efficient than monocrystalline panels
• Takes up greater roof space
• Degrade faster so have shorter guarantees

What About Marine Solar Panel Wattage?

The most common solar panels are 100-watt varieties , but you can opt for more powerful ones.

At the other end of the wattage spectrum, you can find panels that generate 20 or 30 watts. These smaller panels are excellent for charging smaller electrical items like phones and laptops while you're on the move, but you would need higher capacity if you're a liveaboard boater, or you're embarking on an arduous journey across the ocean.

Solar panels typically come in wattage sizes of 30W, 50W, 100W, 150W, 200W and 300W. But as previously mentioned, for larger vessels, opting for two 300-watt panels might be the best option.

Combined, they'll still generate 600 watts and take up less room than three or four smaller panels.

Monocrystalline Marine Solar Panels

1. renogy monocrystalline 100-watt panel.

Long-lasting and robust, this Renogy panel has an efficiency rating of 18.4%. Designed with boats and RVs in mind, they shouldn't take up too much roof space.

2. Newpowa 100-Watt Monocrystalline Panel

This Newpowa monocrystalline panel offers a 25-year transferrable warranty against a drop in power output.

3. Renogy 100-Watt Monocrystalline Flexible Panel

These panels are incredibly flexible and lightweight and come in 50W, 100W and 160W sizes. They're perfect for boats with a flat roof section.

4. WindyNation 100-Watt Monocrystalline Flexible Panel

Like the Renogy flexible panel, this Windy Nation product weighs just 4 lbs and has a flexing ratio of 30 degrees, so getting it to fit the contours of your boat should be easy.

Polycrystalline Marine Solar Panels

5. hqst 150-watt polycrystalline solar panel.

This is the first polycrystalline product to feature, and it's also the most powerful panel so far at 150W. Plus, when you compare the price of this panel to the Renogy monocrystalline model, there's considerable savings to be made.

6. RichSolar 100-Watt Polycrystalline Panel

This polycrystalline panel has a junction box with an IP rating of 65, along with an IP 67 rating for its MC4 connectors. This means that even the harshest conditions at sea won't affect their performance!

7. Newpowa 50-Watt Polycrystalline panel

At 50 watts, this panel is better suited for smaller craft or for requirements that mean you need less power like running GPS equipment or laptops.

8. Renogy 160-Watt Polycrystalline Panel

This Renogy panel is robust and can withstand high winds, so that's one less thing to worry about in the middle of the ocean . It also has a reinforced surface that's able to withstand high impacts, so again, that rogue wave should slide right over this panel, causing no damage. 

Marine Solar Panels Offer Freedom

Whether you're sailing seas on an epic adventure or sticking to lakes and rivers, solar power is cleaner. You don't have to run your engine to top up the batteries, and it's a lot cheaper in the long run because you save on the ongoing costs of burning fuel that could be avoided.

Whatever style or type of solar panel you choose, having energy created from the sun's rays is incredible. It gives you freedom from power woes like nothing else.

Depending on your location and climate, other off-grid options such as marine turbine generators could be a better option. But they're cumbersome and only work when the wind blows.

In my opinion, marine solar panels for boats provide the best green renewable energy, and if you aren't taking advantage of it, then you should be.

• choosing a selection results in a full page refresh

Marine Expert

8 Best Marine Solar Panels – (Reviews & Guide 2022) 

Instead of consuming a huge amount of gas, you can solve all your boat energy problems with the best marine solar panel. Maintaining your battery charged is a never-ending issue for boaters. The electrical requirements for lighting, audio system, and maybe a fridge to keep your drinks cold always drain the batteries.

The marine solar panel reviews we prepared will offer you insight into what you can currently find on the market in terms of top-rated products in this line, and we even prepared a buyer’s guide to help you find a great model that fits your vessel well.

See The Quick Comparison Chart

Benefits Of Marine Solar Panels

First, if you attach the panel to the boat’s electrical system, a lot of fuel will be saved. You no longer have to keep the engine running so your battery does not die on you.

Besides being very easy to maintain, a solar panel can save you in the unfortunate situation your engine breaks down and you remain without any power.

Marine solar panels are eco-friendly because they use renewable energy. If you are an environmentalist, you can do your part in saving the planet by using this type of energy.

Moreover, these panels can save you energy and time, and they can also be used to power small devices on board.

Drawbacks Of Marine Solar Panels

Even though they bring a lot of advantages, there are some things related to marine solar panels that might make you think twice if you want to use them or not.

For example, these units take up space. If you do not have a large boat, you might have issues with space. Therefore, adding such a device would make things even more complicated.

Another major drawback is the sunlight’s availability. You depend on the sun because, without it, there is no energy either. That is why it would not be a bad idea to have a marine battery charger, just in case.

While this might not be an issue for some, you need to know that energy storage is quite expensive. Actually, the entire solar panel system is costly.

Best Marine Solar Panels Comparison Chart

Best marine solar panels reviews, 1. eco-worthy 12 volts 10 watts portable solar panel for boats.

Thanks to its bypass diodes, the power drop generated by shade is minimized. The panel provides a decent overall performance even in low-light conditions. This model is shockproof, dust and rust-resistant, as well as environmentally-protected. The unit comes with pre-drilled holes on its backside which allow you to mount it securely and quickly.

In order to prevent discharge, the panel is equipped with a blocking diode. This unit can charge 12V batteries and it requires very little maintenance. This is not a very small but long extremely large, measuring 8.7 by 13.9 inches. With this size and power, it is not a good option for large vessels.

• Since it only weighs 1.50 pounds, the unit does not affect the boat’s balance in any way
• It is also portable
• The panel can also be used to charge other vehicles such as motorcycles or snowmobiles
• Strong wind may pose a few problems to this model

2. Renogy 100 Watts 12 Volts Monocrystalline Solar Starter Kit

The Renogy 100 Watts 12 Volts Monocrystalline Solar Starter Kit has a great output of 500W per day. It can charge a 50Ah battery in less than three hours. Moreover, the charge controller can be used on any vehicle that uses battery negative on the chassis.

In the same package, you will get adaptor kits, mounting brackets, and cables, alongside the actual marine solar panel. Basically, once you get this kit, you do not need to purchase any other accessories because you get everything you need. This also saves you time and money.

• Due to the high-quality materials, this unit cannot be damaged very easily
• You can use this panel to power more devices at the same time
• The frame is made of corrosion-resistant aluminum for extended use
• The cables are low-grade, so you might want to get marine-grade ones

3. HQST 100 Watt 12 Volt Polycrystalline Solar Panel Power for Boats

• The bypass diodes reduce the impact of shade on the panel
• It can handle stronger winds quite well
• The unit also has a high module conversion efficiency
• A controller is not included so you will have to get one separately
• The cables are shorter than you might like

4. Sunforce 50022 5-Watt Solar Battery Trickle Charger

Moreover, their compact and lightweight design allows you to use multiple panels in varied configurations anywhere on your vessel. This way, you will be able to charge small electronics, without having to turn on the engine. These panels feature aluminum frames and are built to be 100% waterproof.

However, since the power from this thin-film unit does not scale well, it is difficult to achieve high power output. Still, charging 12-volt batteries is not an issue for this marine solar panel. The package includes a 12V DC plug, battery clamps, as well as mounting hardware which makes the installation process quick and easy. What is more, the panel works well in all daylight conditions, even if it is cloudy.

• This is an excellent option for powering less-damaging small devices
• The unit has a built-in discharge/overcharge protection
• It can be used for charging various types of batteries from different vehicles
• Thin-film cells usually wear out after about ten years
• If you want to scale up power using these panels, it will be expensive

5. Newpowa 100 Watts 12 Volts Polycrystalline Solar Panel Marine

For increased durability, the cells of this solar panel are encapsulated in EVA, thus providing excellent performance. The Newpowa 100 Watts 12 Volts Polycrystalline Solar Panel Marine are framed with anodized heavy-duty aluminum which offers extra rigidity. Compared to other similar products, this unit delivers high wattage at a lower price.

Even though it offers a high level of power, it is smaller than other similar alternatives. This means that this model is also suitable for smaller boats. Moreover, the unit can handle high winds of up to 2,400 Pa, as well as snow loads of up to 5,400 Pa. This means that you can mount them on your boat with no worries.

• The diodes are preinstalled in the junction box
• You will also get a pair of three-foot MC4 cables that are already attached
• Compared to many other brands, this model provides a higher cell efficiency
• The attached cables might be a bit too short for certain applications

6. Renogy 200 Watt 12 Volt Solar Starter Kit with Wanderer

It is a complete kit that contains everything you need to get started. You will get two 100 W marine solar panels, a 30A PWM Wanderer charge controller, a 20-foot 10AWG MC4 adaptor kit, an 8-foot 10AWG tray cable, two sets of Z-brackets, and a set of MC4Y connectors.

The negative grounding controller offers protection against battery overcharging, reversed, short-circuit, as well as over-discharging and charging. All these protective features ensure safety as well as wider off-grid applications. Basically, the unit can be used on any vehicle with battery negative on the chassis.

• This kit contains everything you need to get the installation process started immediately
• The system can be expanded to a maximum of 400 Watts
• It can fully charge a 50Ah battery from 50% in only one hour and a half
• The controller is not very performant, you might want to get a different model

7. ACOPOWER 50W Mono Solar Panel 12V for Battery Charging

Due to its construction that contains only high-quality materials, the ACOPOWER 50W Mono Solar Panel 12V for Battery Charging is also extremely durable but also reliable. The installation process is straightforward, as it is a ready-to-install product. The pre-drilled holes make things much easier in this sense.

The unit features high module conversion efficiency with a power of 50W. The panel comes with a 12AWG cable with MC4 quick connectors. This unit is suitable for marine use but also for RVs, cars, caravans, as well as green-house solar systems. Moreover, the unit can withstand strong winds of up to 2,400 Pa, as well as snow loads of up to 5,400 Pa.

• The unit has an anodized aluminum frame and anti-reflection coated glass
• It is waterproof with an IP65 rating
• Thanks to its rugged design, the unit is extremely sturdy and durable
• The charge controller needs to obtained separately, as it is not included in the package

8. DOKIO 100 Watt 12V Solar Panel Marine Boat Off Grid

Moreover, the frame is corrosion-resistant which makes it ideal for marine use. In order to reduce the size, the panel is incredibly thin but not less performant than other similar units. For this reason, the DOKIO 100 Watt 12V Solar Panel Marine Boat Off Grid is maneuverable and lightweight. This marine solar panel has a very high amp rating.

Not only is it perfect for a larger boat, but it can also charge multiple electronic devices at the same time. As long as there is enough sunlight, you will have no issues obtaining the necessary amount of power for your vessel.

• Handling strong winds and snow loads is not a hard task for this panel
• The unit is covered by a 25-year transferable output warranty and a 5-year material warranty
• This model is a perfect balance between technology, function, and style
• The frame is not as rigid as expected

What Are Marine Solar Panels?

Marine solar panels are like normal solar panels that gather energy from the sun so that you can make use of the necessary power in your boat. Their most common use is to recharge the batteries and to power the electrical systems in vessels.

How Do Solar Panels Work?

Solar panels work by allowing particles of light, or photons, to free electrons from atoms, thus creating a flow of electricity. A solar panel comprises many, very small units, called photovoltaic cells .

In plain English, this means that they transform sunlight into electricity. To better understand, every photovoltaic cell is like a sandwich made of two slices of semi-conducting material which is usually silicon.

In order to work, these cells have to establish an electric field that is similar to a magnetic field. This one does not use opposite poles, but opposite charges that are separated. To obtain this field, sun panel manufacturers mix silicon with other materials offering the so-called sandwich a positive or negative charge.

Namely, they scatter phosphorus into the silicon, in the top layer, and this adds more electrons with a negative charge. At the same time, the layer from the bottom receives a dose of boron. This results in fewer electrons that produce a positive charge. At the junction between the silicon layers, an electric field is produced.

When a photon of sunlight knocks an electron free, it will be pushed out of the silicon junction by the electric field. A few other components of the cell convert these electrons into usable power. Then, the metal conductive plates of the cells gather electrons and transport them to wires. At this point, these electrons can flow just like any other source of electricity.

Types Of Marine Solar Panels

Solar panels can be divided into two major categories, flexible and standard, and into three other categories, based on the technology they use. We are going to discuss each category so you can understand better.

1. Flexible

This type is extremely convenient to use because they are made to bend or be curved. As a result, they can fit any surface and your particular needs. They represent an excellent alternative for small boats, where space is an issue.

Moreover, flexible solar panels are extremely easy to install as they are lightweight and do not have metal backs. However, if you want quality or durability, you should get a more expensive model instead of a cheap one that will not last you very long.

2. Standard

Just like the flexible panels, these also have an aluminum back. However, they are rigid and not at all flexible. Therefore, these panels are recommended for larger vessels, where space is not a problem.

3. Monocrystalline

These panels have the highest efficiency rate in direct sunshine. However, they generate an extremely intricate process of silicon monocrystals. Basically, a group of single cells is gathered together to one solar panel. The panel itself is small, and, therefore, requires less space.

4. Multicrystalline

The efficiency of these panels is about 1 or 2% lower than that of monocrystalline models. They are also called polycrystalline solar panels. Their production costs are a bit smaller because the silicon used is not pure. They are made from single biscuit-like slices of silicon crystals. These panels are cheaper, but they also provide a lower efficiency.

5. Thin Film

Unlike the other two types, thin-film solar panels are made of various materials. The most common type is made from cadmium tellurium. Manufacturers place a layer of this cadmium tellurium between conducting layers that are transparent and can help collect sunlight. These panels are also equipped with a layer of glass on the top for protection.

Another material used for these panels is amorphous silicon. This composition is similar to that of monocrystalline and multicrystalline panels. These units are created by placing non-crystalline silicon on top of metal, glass, or plastic.

Copper Indium Gallium Selenium is also used to make thin-film panels. All four elements are placed between two conductive layers that can be made of glass, steel, aluminum, or plastic. Then, electrodes are put on the front, as well as the back, of the material in order to catch electrical currents.

Marine Solar Panel Buying Guide

Before you do anything else, you need to think about how much power you would need. Different types of marine solar panels generate different amounts of power. If yours does not deliver the necessary amount, your investment is useless. Having too much power is also more expensive than needed.

For example, some boat owners use their solar panels only seldom, to charge their phones or other small electronic devices. Others, however, rely on the panels to run, navigation systems, marine amplifiers , refrigerators, water purifiers, or other similar units.

You should also consider whether you are going to rely on your engine as a power supplement as well. Once you decide how you plan to use your marine solar panel, you can easily figure out how much power you will need.

Basically, what you need to do is add up the wattage requirements of all the devices you want to power up with the panel. Keep in mind that the maximum power of the unit should exceed your estimation.

It is also important to consider your battery’s capacity to handle cloudy days. Depending on your power requirements, you can either get a more powerful solar panel or for more panels that are less powerful.

2. Performance

Since you are going to be in outdoor environments, the performance your solar panel is capable of delivering in various weather conditions is extremely important. Unfortunately, cloudy conditions can drastically affect the efficiency of a solar panel.

In very dark weather, the current generated by your panels can slow down very fast. In these situations, you will need much more power capacity compared to a normal sunny day. You may also need to help your battery by keeping the engine running.

Temperature is another factor that can influence the performance of a solar panel. For example, if you are traveling in a warm climate, the monocrystalline panels are more efficient than multicrystalline units. However, the performance capacity is reversed for these two types in colder temperatures.

This is not such an important aspect when you have a large vessel where space is not an issue. However, if the space is limited, the size of the panel is essential as well. Normally, the more energy the boat consumes, the larger the panel you will need.

You should not forget about efficiency either! If you chose a huge solar panel, it does not mean that it is the most efficient. You should try to find a model that is capable of generating a large amount of power and, at the same time, has a small footprint.

We are not going to discuss the various types of marine solar panels because we have already dedicated an entire section to this. However, when looking for a product, you should have this in mind.

Different types of solar panels perform differently in various conditions, and you need to keep this in mind before you decide on the type that can serve you best.

5. Resistance and Durability

Moreover, a marine solar panel is not the cheapest item you can get for your boat. Therefore, you should choose a product that is covered by a warranty for at least ten years. Maybe you did not know, but most crystalline panels should last up to 25 years before they need a replacement.

6. Mounting Options

This is another important aspect you ought to consider. Depending on the type of boat you have and its size and available space, a specific solar panel might not be suitable for you. It may have a good size, but the mounting options of the unit might not permit it to be mounted on your vessel.

Therefore, before you decide on a product, think about where you can mount it, and see if the item’s installation requirements match the possibilities offered by your boat.

Moreover, make sure you know what you are doing and that you mount the unit correctly. Follow the manufacturer’s indications, and if you are unsure of anything, call a specialist who can offer professional help.

Another thing you should know is that many manufacturers offer marine solar panel kits. Some of these are extremely helpful because they allow you to install the unit fast and easy. Also, since connecting more panels together may be a hard task if you do not have any skills in this sense, you should look for kits that come with cables.

Furthermore, solar charge controllers are essential for adjusting the power output from your panel in order to protect your battery from overcharging and any other damages. In most cases, getting a kit is also less costly than obtaining all the necessary tools separately, so you should think about this as well.

8. Extra Features

There are marine solar panels available that come with extra features meant to enhance the flexibility of the unit.

For instance, you can get a model that is equipped with a built-in USB charging port which enables you to charge your smartphone without using any additional devices or wiring.

Also, flexible solar panels or foldable models make it much easier to mount pretty much anywhere on your vessel.

How And Where To Install Marine Solar Panels?

The most suitable places to mount a solar panel are usually on top of the bimini, on an arch, between two stanchions, on a pole or a rail, on top of dingy davits, or on an arch. Some kits allow flexible panels to be attached to the canvas top.

However, when it comes to flexible solar panels, you should know that they require a sturdy backer board, otherwise, they will fail after a short period. Anyway, it is important to plan these details ahead, depending on the configuration of your boat.

Once you find the best spot, make sure you follow the manufacturer’s instructions to the letter. Failing to do so may result in an inefficient panel and you may also lose the warranty, so be careful with this!

You should use tinned marine grade wires because standard automotive wires will lose their conductivity in the marine environment. Also, you need to have a charge controller with settings for your type of battery which will keep it from overcharging.

The positive lead from the panel’s charge controller needs to be fused in order to protect from over-current. Moreover, in case you do not have a battery monitor on board, you should install one or get a controller that comes with a meter.

Maintenance & Safety Tips For Marine Solar Panels

For this, you can use a nano-hydrophobic self-cleaning material that is used to cover the panel and maintain its efficiency level high for a long period. Basically, this coating provides a protective barrier that disables water from penetrating the panel and even from sticking to its surface.

However, you still need to clean your marine solar panel. You can do so by using warm water and a mild detergent. Microfiber rugs are great to remove dust and to dry the panel once it is clean. Another thing you should do is check the wires and electrical parts to make sure that they are dry and everything works well. Whenever in doubt, immediately call a technician!

There is an aspect we have not mentioned before: not installing the panel in a correct place might cause the boat to lose its balance. This is a safety tip not only for your investment but for yourself as well. Fortunately, nowadays you can get professional advice and services, so do not hesitate to use them if the situation calls for it.

FAQ About Marine Solar Panels

1. should i have additional equipment to use marine solar panels.

If you do not want to get a complete marine solar panel kit, you will need to get a charge controller. This device is designed to protect your battery or batteries from overcharging. Also called regulators, these units are rated by a maximum number of amps in the solar array.

Also, depending on how many batteries you have, you should get a wire for each. Still, make sure you do not use automotive wires as they will lose conductivity very fast in the marine environment. There are tinned marine-grade wires you can use safely.

2. How Much Power Do I Need To Charge Laptops and Smartphones?

A laptop requires different amounts of power depending on how you are using it. If you are working on it, you will need at least 60 watts of power. However, if it is in a standby mode, the requirement is between 15 and 30 watts.

Phones do not require so much power in order to charge. Even if you are using it, you should not need more than 15 to 20 watts. When you are looking for a solar panel for your boat, make sure you add up the power requirements of all the devices you want to power up.

To this sum, add another 10 to 20%. That is the power you will need from a marine solar panel. Still, depending on the weather conditions, you might not always get as much power as you need. But on a normal, sunny day, you should have no issues powering up your electronic devices.

3. How Can I Control The Charging Process Of My Devices?

The best method to control the energy that is being used to charge your batteries is to use a charge controller or regulator. This device is not only inexpensive, but it will also protect your battery from being overcharged and from other possible damages.

4. What Should I Do if My Solar Panel Is Not Charging the Battery?

If you’ve already connected your battery to your solar panel but it does not charge, it is either a battery problem, an incorrect system connection, or an issue with the charge controller settings. It is extremely important for the panel, controller, and battery to be configured correctly.

You can diagnose the problem by measuring the entire system from the battery, charge controller, to the panel using a multimeter. Disconnect the panel and measure the voltage. In case no voltage is detected, there may be an issue with the solar panel.

You also need to measure the voltage of the battery. If it is lower than 20%, you should charge the battery with an extra charger. If both the solar panel and the battery show normal output and voltage, there might be an issue with the controller, and you need to replace it.

However, if you encounter such issues, we strongly recommend that you get in touch with a technician for professional help.

Solar panels represent an excellent way of getting more power, using less diesel, and protecting the environment, at the same time. In order to find the best marine solar panel , you will need to think about how much power you require for your battery and all your electronic devices, where you will place it, and how you will mount it. In other words, you will need to do a bit of research before deciding the most suitable product.

The good news is that we have already done some of the work for you. Our buying guide, marine solar panel reviews , and all the other information are meant to familiarize you with pretty much all there is to know about these products. If you follow our recommendations, we are sure you will find a unit that will best suit all of your requirements in terms of power on your boat.

Bonus guide: boat grill reviews

About Peter Richardson

Peter Richardson decided that he needs to balance out the sedentary lifestyle of a software developer by getting out there more. He found passion in none other than – boats. This website represents everything he learned along the way. Finding the right equipment for your boat is no easy task, and that is what Peter’s articles aim to help you with.

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9 Best Marine Solar Panels for Boats – (Reviews & Guide 2021)

Producing green energy doesn’t have to be something we do on the land-only. One of the most essential parts of your watercraft is the best marine solar panels. With it, you get to power your appliances on board and maybe even get hot water. The best part is that the environment isn’t harmed by this energy production.

But choosing the right solar panel for your watercraft can be very difficult because there are so many questions about the purchase.

What actually is a marine solar panel? Is it necessary to have one? How to choose the most appropriate unit? Is the installation hard? Can you take proper care of the panel?

The answers to all these questions are simple, and here we are going to discuss everything you need to know – some vital information, tips, and even marine solar panels reviews – so you can make the right decision for your boat.

Best Marine Solar Panels Comparison Chart

Best marine solar panels reviews (editor’s picks).

These are some of the most popular products, you may find on the market. Each one of the products has some advantages, but also some disadvantages. Our team has collected these products and their features, so you can take your decisions, which you want to buy. Keep in mind, that they are not arranged in a specific way.

1. Renogy Monocrystalline Solar Starter

The package includes mounting brackets, adaptor kits, cables and of course the solar panel. The dimensions are 47×1.5×20.9,” and the shipping weight is 25.9 pounds.

Like every other product, this one has pros and cons. Let’s take a quick look at them.

• Good quality
• Good wattage
• It can be used to power more things at ones.
• Super durable – the quality of the material is high-class, and the panels cannot be damaged easily.
• The quality of the charge controller can be better.
• Low-grade cables

2. Battery Tender Solar Maintainer with Built-in Super Smart Charging Controller

Of course, the solar panel has some advantages and disadvantages. You need to know all of them, so here is a shortlist.

• The temperature sensor is built-in.
• Good quality of materials. The panel works well for a long time.
• Easy installation and maintenance.
• When it is turned off, the battery drains fast.
• When part of the panel is in shadows, it does not work fine.
• A short life of the battery.

3. HQST Monocrystalline Solar Panel for Boat (Compact Design)

Here we are going to face you with some benefits and drawbacks of this solar panel.

• Even in a shaded area, the panels produce enough power.
• Excellent performance of the system.
• The panel handles the winds very well.
• Complicated installation
• Cables are not included.

4. ECO-WORTHY Solar Panel for Boat with Alligator Clip Adapter

Pre-drilled holes on the backside of the panel allow quick mounting and securing. It also has a blocking diode, used to prevent discharge. The panel can charge 12V batteries, and the maintenance is almost none. The size is essential – it is not small and not significant at the same time – 8.7×13.9″.

• Easy to install
• Easy to maintain
• Very light, it weighs only 1.50 pounds
• Controller and cables not included.
• The voltage is low, and the panel could not be used for charging big things.

5. WindyNation Solar Panel Kit

The LCD Screen shows you essential information like amperage, voltage, etc. This one is very suitable with bigger boats, its dimensions are 40×1.4×26.4″ – so it is big enough and you must have enough space for it. The shipping weight is 10.86 pounds.

• High voltage
• Instruction for installation
• Excellent performance of the controller and battery.
• Hard installation.
• No fuses included.
• Bad quality of cables.

6. ACOPOWER Mono Solar Panel for 12V Battery Charging

Except for its usage on your boat, after the sailing season, you can also use it for a caravan, RVs, cars, boats, a greenhouse. Other ways of usage are such as a set of a solar system, solar light, solar pump, etc. The aluminum frame and anti-reflection glass give the solar system a longer life. This item also has a waterproof display. It is medium size – only 11.5×11.5×0.9″ – and the shipping weight is 6.5 pounds.

One quick look at the benefits and drawbacks of using this particular item:

• Straightforward installation
• Resists on bad weather
• Excellent quality of the battery and the controller
• If part of the panels is in shadow, the performance is bad
• Cables are not long enough

7. Renogy Extremely Flexible Monocrystalline Solar Panel

This product is excellent, but it has not only many advantages, but also some disadvantages. Let’s take a quick look at them:

• Very flexible
• Very light and easy to transport
• Very easy to install
• Excellent performance on overcast days.
• Grommets are not included.
• If there are some clouds, the performance is terrible.
• Cables are not included too.

8. Newpowa Poly Solar Panel Module

The product may have high performance, and everything sounds great, but it also has some drawbacks. So here you can check some of them.

• It is very light
• Easy installation
• The product has a warranty
• Cables and controller not included.
• It doesn’t have top performance in winter and in adverse weather conditions.

9. Richsolar Black Off-Grid Portable Monocrystalline Solar Panel

As you already read, this particular product has some advantages, but also some disadvantages.

• Excellent performance in shadow and lousy weather
• Solid electrical output
• Not so portable

What Are Marine Solar Panels?

One of the main problems of people who live on boats except finding excellent boat equipment is the extraction and consumption of electricity and fresh water. 99% of the cruise ships nowadays have solar panels and wind generators, but in 99% of cases, they are not enough to cover their electricity consumption and have to burn the motors or generators if not every day, then every day.

In other words, the marine solar panel is just a solar panel that collects energy from the sun and uses it to power the boat in many ways. The most popular use of this type and the Sunpower marine solar panels is to recharge the batteries in the boat, but it can be used to power the electrical system of the sailboat.

Types Of Panels

Flexible Marine Solar Panels

Extremely comfortable, they are designed to be curved or bent, so they can fit any surface and most importantly your specific needs. They are perfect for small boats, where you have cramped space. This type of panels is easy to install because it is light and does not have the metal back. If you choose this type pick one of the best flexible solar panels for your needs, don’t buy a cheap product, that provides poor quality.

Standard Marine Solar Panels

They have an aluminum back, just like the other solar panels. They handle the rain and other adverse weather conditions perfectly. But they are also cumbersome and not flexible at all, so these panels are recommended if you have more space on your boat.

All marine solar panels can be divided into four other categories, according to the type of technology used.

Monocrystalline

Have the highest efficiency in direct sunshine, but also produce the most complicated process of silicon monocrystals. The oldest one. A group of a single cell is collected together and formed a single solar panel. The panel is small, uses less space.

Multicrystalline

Their efficiency is 1-2% lower than that of Monocrystalline panels, their production costs are also slightly smaller because not so pure silicon is used as in Monocrystalline. Made from single wafer slices of silicon crystals. It has a lower efficiency than the previous type but is cheaper.

This production process is, and therefore these are the cheapest solar panels. On the other hand, they have almost twice the efficiency of the crystalline panels. Just put – for the same installed power you will need twice as many panels. Less efficient than the Multicrystalline and the Monocrystalline, that is why the panels are more significant, can handle the hot and sunny day better than other types. This one has ‘shadow protection’ and can produce energy, while part of the cells is in shadow.

Amorphous Silicon

The cheapest type. It is made of crystal silicon material on a glass, steel or plastic sheet. It is almost the same as the Thin Film, has the same protections, but is cheaper to produce.

Benefits Of Using Marine Solar Panels

• If the panels are attached to the electrical system of the boat, it will save you a lot of fuel. And since we mentioned fuel, the portable marine fuel tanks for small boats are handy, and they are an essential part of your sailing boat set. Without electricity and fuel, what are you going to do in the water?
• They are environmental-friendly. The panels use renewable energy, which is very important, because we all live on the same planet, and yes! We care for the Earth.
• It is very easy to maintaining and can save you in dangerous situations, if the engine break-down and leaves you with no power, the solar panel can save you.
• Panels will save you time and energy.
• You can use them to power small things on board.

Like everything else, marine solar panels have some disadvantages, and here you can take a look at them.

• Solar panels take up space. Sometimes you do not have enough space on your boat, and solar panels are not a good idea.
• Energy storage is expensive.
• Sunlight availability. If there is no sun, there is no energy too.
• The whole solar panel system is expensive.

When you decide to buy something, it is essential to look for particular functions. Our team has done some research, and here we have collected the most critical information.

• Size – The size matters. Check the dimensions of the panel carefully – if it will fit your boat and your needs.
• Wattage – Check how much energy you need. When you have the idea of how much power you need, check the wattage of the solar system.
• Batteries and storage – Some types of solar panels can store energy. This is a perfect feature for rainy days.

Installation

Installation of the marine solar panel , just as the installation of the outboard motor can be hard. Our most important tip is to check the manual of the manufacturer. But here are some more tips for easier installation.

• All parts of the solar systems must be waterproof.
• Choose the right place on the boat to install the panel.
• Be careful with the wires. The boat’s configuration will define where the cables will go.
• Check the type of the panel – with zips, with Velcro, with glue or with frame.
• Always follow the instruction for installation.

Maintenance

A new technology to fix this is the self-cleaning nano-hydrophobic material that covers the panel and maintains its high efficiency over long periods. The cover the panel is sturdy as it actually involves covalent bonding which goes to the top side of the panel that faces the Sun. This is an excellent advantage over-spraying coatings, whose characteristics worsen over time.

The principle of this coating creates a barrier that stops water from penetrating the body of the panel or to even stick to the surface. This explains also why all panels are tilted. It’s so that water can drip down freely without staying on the surface of the unit.

This means that when the treated surface is tilted, the water spheres are rolled out of the surface. Taking care of all your stuff is essential. Your marine solar panel is not an exception.  Now we can discuss how to maintain it.

• Check the manual for instruction.
• Use some warm water and mild detergent.
• Microfiber rug will help you to remove dust.
• Always make sure that the system is completely dry.
• Always check if the wires are dry.
• Check all electrical parts to be sure everything is okay.

Safety Tips

In the final, our team has prepared some tips for your safety. Do not forget that security is paramount.

• Do not forget to check the system frequently.
• If you have some doubts, call a technician. They will help you.
• All wires must be dry.
• If not install correctly, the system will not work right.
• Not cleaning the panels will cause a lack of sunlight and energy.
• If you do not choose the right place for the panels, the boat can lose its balance.

Well done, you guys, you have successfully finished our buying guide on finding the best marine solar panels . Having read our reviews on the classiest marine solar panels and our additional information and tips, you now realize that finding a reliable product can be a bit hard. It is necessary to have the right pump for your boat, do not forget the maintenance and always follow the manual and the safety tips, so you can enjoy your boat and your trip in the water.

If you find our guide useful, forward it to your sailing-loving friends. Also, do not hesitate to contact us – your opinion is important! Comment, sent us an email – tell us what you think!

We hope that you find this text interesting. Find some more free time and check our articles – you can find information about all the marine supplies you need.

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6 Best Solar Panels for Sailboats in 2023

Categories Boating

Solar panels are a great way to power your boat and enjoy off-grid benefits. You can use them for charging batteries, running lights, or even providing you with hot water. The best solar panels for sailboats are those that can withstand the harsh marine environment and provide you with clean, quiet energy.

Six best solar panels for sailboats

Here are our top six picks for the best solar panels for sailboats:

Renogy Flexible Solar Panel 175 Watt 12 Volt

This Renogy solar panel is one of the best options for a sailboat. This product has an efficiency rate of 16-18% and will produce an average of 175 watts.

The Renogy flexible solar panel is a durable and lightweight product that can easily mount on any surface.

The best feature of this product is the 10-year warranty that Renogy provides. This solar panel can be used in any weather condition and will not become damaged or broken easily.

The best part about this product is the price. It is one of the most affordable solar panels that you can purchase. This product is perfect for any boat or RV and will provide a reliable energy source.

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HQST 100 Watt 12V Solar Panel

The HQST 100-watt solar panel is one of the best solar panels for sailboats. The HQST 100-watt solar panel can charge multiple batteries and other devices.

The HQST 100-watt solar panel is highly efficient as it can charge multiple batteries and other devices.

The HQST 100-watt solar panel is eco-friendly and durable. The HQST 100-watt solar panel is a one-time investment that will save you money in the long run.

The HQST 100-watt solar panel is water resistant, shockproof, and has an anti-corrosion coating.

Topsolar Flexible Solar Panel 100W 24V/12V

The Topsolar Flexible Solar Panel 100W 24V/12V is an excellent option for sailboats. It is a practical, semi-flexible, cheap option. The connectors are incredibly robust and withstand lots of wear and tear over time.

The maximum energy absorption is crucial if you want to increase the performance of your solar panel.

The Topsolar Flexible Solar Panel can be mounted on pretty much any vessel, either flat on the surface of your deck or curved around the mast. This is an excellent feature as it allows you to take advantage of the sun’s energy no matter what shape your boat is.

You can use the Topsolar Flexible Solar Panel with the Topsolar Tripod for mounting your boat’s mast.

This is a great option to consider if you want something that will improve your sailboat’s performance without breaking the bank.

SunPower Flexible 110W Solar Panel

The SunPower Flexible Solar Panel is made with high-quality materials, ensuring durability. The solar panel can be easily portable and flexible. The solar panel has a five-year warranty on power and a two-year warranty on the product.

The solar panel is lightweight and has a durable build. The output quality of the solar panel may deteriorate over time, but you can use the extended warranty to address this issue.

The solar panel is also weatherproof, so the elements will not damage it. The only disadvantage of this solar panel is the price.

Newpowa 30W Watts 12V Solar Panel

The Newpowa 30W Watts 12V Mono Solar Panel is one of the best solar panels for sailboats. The Newpowa 30W Watts 12V Mono Solar Panel is a high-efficiency solar panel perfect for sailboats.

It is a monocrystalline solar panel that offers a 25-year transferrable warranty against a drop in power output.

The Newpowa 30W Watts 12V Mono Solar Panel is a 100% waterproof solar panel that can protect things when the doors and the soft or hardtop roofs are removed.

The Newpowa 30W Watts 12V Mono Solar Panel is a durable solar panel that can withstand weather conditions and sunlight exposure.

ECO-WORTHY 100 Watt Solar Panel

The ECO-WORTHY 100 Watt Solar Panel is one of the best solar panels for sailboats. This panel type comes with a warranty and IP65 water and dustproof rating.

This solar panel is lightweight (only 13 pounds) and has all the accessories needed to install it on your boat. The panel is easy to install and waterproof, so you don’t have to worry about any damage from the rain or water splashes.

The ECO-WORTHY solar panel is designed to work well with different types of boats. It has everything you need to install on your boat, including a mounting bracket and an MC4 connector cable.

How to choose the right solar panels for your boat

To choose the right solar panels for your boat, you must determine how much power your boat uses. The first step is to determine how many amp hours your appliances use daily.

You can use a battery monitor to measure the energy your fridge, lights, or the other appliances on your boat consume while in use.

After finding the amp hours your boat uses per day, you can determine the wattage of power your solar panels need to produce. For example, if you have a 50-watt panel and use 30 amp hours per day, you would need two 50-watt panels to produce enough power for your needs.

Additional things to consider are whether you need a charge controller and if you have enough unshaded space for your solar panels to absorb the maximum amount of sunlight.

What are Flexible and Rigid Solar Panels?

Rigid solar panels are more efficient but less robust than flexible panels. Monocrystalline cells offer a better output than polycrystalline cells. The output voltage depends on the number of cells on the panel.

Module efficiency is now more often around the 20% mark, as opposed to 12-15% for older models and semi-flexible (up to 20° bend) is usually better than flexible (up to 180° bend).

If the maker offers a 25-year guarantee instead of a 3-5 year one, you can be pretty confident they’re good. Regarding charge controllers, it’s worth paying a little more for a decent MPPT.

How many solar panels do I need for my sailboat?

You will need between 2-8 solar panels for your sailboat. The amount you need depends on the size of your sailboat and how many electronics you need to power. 2-4 panels should be enough if you have a small sailboat. For larger boats with more electronics, 4-8 panels are recommended.

What are the benefits of solar panels for sailboats?

Solar panels are a great alternative to running a gasoline generator or taking power from the grid. Solar panels are eco-friendly and can be a lifesaver if you are at sea for a long time. Solar panels can provide comfort amenities such as access to a tv, microwave oven, etc.

Solar panels are an excellent option for sailboats because they are eco-friendly and have many benefits that make sailing more enjoyable. The best solar panels for sailboats are durable, easy to install, and produce a lot of power.

What are the disadvantages of solar panels for sailboats?

Solar panels for sailboats rely on the sun on to generate electricity. Sailboats are limited in space and cannot carry large solar panels. Solar panels can be expensive to install on a sailboat. Solar panels for sailboats are less efficient on cloudy days.

How much do solar panels for sailboats cost?

Solar panels for sailboats cost a few hundred dollars each. Permanent solar panels can cost one or two thousand dollars in some cases. Portable solar panels can cost just a few hundred dollars each.

If you are installing permanent solar panels because you plan to be making long voyages, it is ideal to have two or perhaps even three large batteries hooked up to your boat.

Do I need a professional to install solar panels for sailboats?

You do not need a professional to install solar panels for sailboats. Solar panels can be installed on sailboats by anyone that is reasonably handy. You can also install solar panels yourself if you are handy.

If you do not feel comfortable installing solar panels yourself, you can hire a professional to install the system for you. An excellent marine electrician will be able to help with your solar panel installation.

Are Solar Panels Safe On Sailboat Boats?

Solar panels are generally safe to use on boats. The panels themselves have a minimal risk of starting fires. However, if they are damaged, they may become unsafe.

Solar panels are covered by glass that keeps them safe from sharp shards of glass. However, if the panel gets wet, it can become deadly due to the combination of electricity and water.

The Best Marine Solar Panels of 2024

Recharge batteries and power up marine electronics by using the sun’s energy..

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Solar panel question/Recommendations

• Thread starter artleyt115
• Start date Jan 25, 2023
• Forums for All Owners
• Ask All Sailors

Attachments

• Power plan.pdf 54.7 KB Views: 70

You need to get a charge controller for the solar panel... then... yes... it would be okay to hook it up to your one battery. @Maine Sail has a few good writeups on this topic.  

artleyt115 said: Hello everyone! It’s me again asking more power questions (Hooray!) so I have all my devices in the boat now and I drew up a little excel sheet of how much everything can consume and the hours we plan to run the devices. Now by my (poorly done) math I should expect around 4 day of battery usage of my one GEL 100ah battery with all electronic do-dads on the boat. Now some things (like the fridge) were put at the average consumption, though when I wrote the excel sheet, I put both the initial cooling wattage and the idle wattage (I plan to run that in the house over night before a trip to get the fridge to temp then put it in the boat). So, my questions; if I add another battery in parallel, in theory it should give me 4 days of capacity. If I add another battery, can I put a 200w solar panel on the boat and expect the batteries to be able to take the possible 30amp it can (potentially) produce. And can I put the same solar panel on just one battery for now (Until I buck up and buy the other one) and expect one battery to withstand it? Also (I know sorry) I have a 10a (2 bank) battery charger that I am hooking up, if I get two batteries in parallel can I put one bank on each battery? View attachment 212454 Click to expand

dlochner said: You're off to a good start. If you are unsure of your math, please post the spreadsheet so we can check the formulas, much easier than doing the math ourselves. A few comments: Pick one unit of power, either watt hours or amphours, it is much less confusing that way. Batteries placed in parallel should be of the same age and type to ensure the charges on the battery are balanced. This will lead to longer battery life. Lead Acid batteries generally have a maximum usable capacity of 50% of the total capacity, if the battery is fully recharged between discharges. Realistically, when cruising or when shore power is not accessible, they have a useable capacity of 40%. There are a few exceptions, carbon foam batteries and a couple of high end AGMs have a larger capacity, up to about 70%. Charging a battery is inefficient, it will take between 110% to 120% of the used ah to recharge the battery, i.e., for every 10 ah that is used, recharging will require 12 ah. Solar panels will average efficiencies can be expected to produce 3 times the nominal power each day. A 100 watt panel will produce about 300 watts (25 ah) on average per day, less on cloudy days, a little more on bright sunny days. High efficiency panels (expensive) panels can get close to 4 times. AGM batteries can generally absorb 20 to 40% of their rated capacity when charging in the bulk phase (constant current). This is written as .2C. A 100 ah battery can take a charge of 20 to 40 amps in the bulk phase. Reputable battery manufacturers will use the 20-hour discharge rate to label capacity. Less reputable ones will use the 10 hour rate which tends to yield a higher capacity rating, but less actual capacity in real life settings. A two bank charger can not deliver more than its rated capacity. When 2 batteries are connected, the charge current is divided between the two batteries. Your 10a charger will only put out 5a per battery, which will lead to under charging and very long charge times. Click to expand

dlochner said: You're off to a good start. If you are unsure of your math, please post the spreadsheet so we can check the formulas, much easier than doing the math ourselves. Click to expand

artleyt115 said: This is some really good information, from the sounds of it I should be able to use the 200W solar panel with no issues. (especially with a controller) I'll attach the sheet (though I did not use the formulas on the sheet I just hand did the math) I figured the charger was under powered for even one battery but I mainly figured it was a trickle charger to keep in the boat when I have it on a trailer. Though I didn't know about that absorption rate on the battery, that's awesome! Btw I heard through the grape vine that when a batteries are in parallel they have to be charged slower, is this true? (I don't think this is true but I thought I'd ask) Click to expand

Ralph Johnstone

artleyt115 said: The site wont let me post it :/ Click to expand

artleyt115 said: ... (especially with a controller) ... Click to expand

Timm R Oday25

A couple of thoughts . We also have 25 Oday . A 200 watt solar panel is going to take up an enormous amount of room . We mounted a 30 watt off the back of the rear pulpit . I ran the wiring inside the railing ,under the cockpit and into the regulator mounted on the back of the bulkhead . Most of the electronics you have listed most likely will only run randomly throughout the day . We actually have two solar panels, one for each battery . The "charging" we get from the outboard is maybe 3 to 4 amps . Normally ,we draw down one battery until we are at 12.3 volts . We then flip the battery selector switch to the other battery . While we don't have refrigerator, the auotpilot uses several amps at a time when in use. We've been able to stay out for as long as a week this way  

Timm R Oday25 said: A 200 watt solar panel is going to take up an enormous amount of room . Click to expand

200 Watt 12 Volt Flexible Monocrystalline Solar Panel

Highest Efficiency (up to 25.4%) And Best Flexible, Rigid, And Walkable Marine Solar Panels For Your Boat in 2024. We'll help you decide on the right solar panels to meet your power needs.

Maintenance of Flexible Solar Panels

dlochner said: I didn't realize the site blocked excel files, probably because of macros that could hide malicious code. You must use a controller. The Victron controllers with Bluetooth are a good choice, easy to program and efficient. When batteries are in parallel or series they act as one large battery. Batteries in parallel will increase the ah capacity and the charge capacity will increase, but not the acceptance rate, it will still be .2C, but 20% of 200 ah instead of 100ah. Click to expand

Timm R Oday25 said: A couple of thoughts . We also have 25 Oday . A 200 watt solar panel is going to take up an enormous amount of room . We mounted a 30 watt off the back of the rear pulpit . I ran the wiring inside the railing ,under the cockpit and into the regulator mounted on the back of the bulkhead . Most of the electronics you have listed most likely will only run randomly throughout the day . We actually have two solar panels, one for each battery . The "charging" we get from the outboard is maybe 3 to 4 amps . Normally ,we draw down one battery until we are at 12.3 volts . We then flip the battery selector switch to the other battery . While we don't have refrigerator, the auotpilot uses several amps at a time when in use. We've been able to stay out for as long as a week this way Click to expand

rgranger said: Here are some more ideas and products... Highest Efficiency (up to 25.4%) And Best Flexible, Rigid, And Walkable Marine Solar Panels For Your Boat in 2024. We'll help you decide on the right solar panels to meet your power needs. Marine solar panels with best Sunpower cells, 23.7-25.4%+ efficient, A+ grade solar cells only. All info and consulting available to help you choose the ideal solar panels for your needs. Visit or call, we're more than happy to help. www.custommarineproducts.com Maintenance of Flexible Solar Panels maintenance of your flexible solar panels is easy, simply routinely keep them clean, check for structural integrity, and check the efficiency using monitoring functions in the charge regulators to ensure all is operating at optimum performance. coastalclimatecontrol.com View attachment 212460 View attachment 212461 View attachment 212462 Click to expand

rgranger said: You know.... this rabbit hole is deeeeep! We could start talking about electric outboards, LiFePO4 batteries etc. Click to expand

artleyt115 said: Yea it is, I dont plan to move to LiFEPO4 but I wanted an electric outboard originally just not too many good ones out there yet :/ Click to expand

Cruise – Electric Outboards with 6 to 25 HP – Torqeedo

rgranger said: Actually this Torqeedo Cruise is well reviewed and is equivalent to a 6 HP. My next pocket cruiser will get an upgrade to something like this... Cruise – Electric Outboards with 6 to 25 HP – Torqeedo Torqeedo Cruise outboard motors are state-of-the-art electric drive systems for boats up to 10 tons. With a respectable performance of 6 to 25 HP. www.torqeedo.com I go sailing for the silence and running an OB kind of ruins it for me. Click to expand

I'm confused by the 87w/12w rating on your fridge. You listed 288.0 WH, which is 12w * 24H. 12 watts seems too low. Let's assume 30w on average. Your inverter will draw power, even though you have N/A listed. A Victron Multiplus 2000 will draw anywhere from 3-9 watts depending on how search mode is configured. Let's assume 6 watts draw, 24 hours per day. Your depth meter is only used when sailing, not 24 hours. Call it 6 hours. Using your figures in addition to the assumptions above, I get a total of 3196.2 watts per day. A 200w panel will contribute around 800 watts per day. Figure in losses for voltage drop, battery efficiency and operating with an 80% depth of discharge, you'll need 227 AH of storage or 3 100AH batteries for 1 day away from shore power. Limit the PS4 to a couple of hours per day and you can eliminate 1 battery. But it might cause a mutiny. The numbers seem high but math is math.  

mermike said: I'm confused by the 87w/12w rating on your fridge. You listed 288.0 WH, which is 12w * 24H. 12 watts seems too low. Let's assume 30w on average. Your inverter will draw power, even though you have N/A listed. A Victron Multiplus 2000 will draw anywhere from 3-9 watts depending on how search mode is configured. Let's assume 6 watts draw, 24 hours per day. Your depth meter is only used when sailing, not 24 hours. Call it 6 hours. Using your figures in addition to the assumptions above, I get a total of 3196.2 watts per day. A 200w panel will contribute around 800 watts per day. Figure in losses for voltage drop, battery efficiency and operating with an 80% depth of discharge, you'll need 227 AH of storage or 3 100AH batteries for 1 day away from shore power. Limit the PS4 to a couple of hours per day and you can eliminate 1 battery. But it might cause a mutiny. The numbers seem high but math is math. Click to expand

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10 Best Sailboat Solar Panels And Their Reviews For 2021

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Sailboat solar panels form a vital part of the entire solar system of the boat, alongside, charge controllers, inverters and a battery.

Once installed, and sunlight hits the solar panel, it generates electrical current and that current is stored by the batteries, which is used for the boat’s electricity needs.

Using solar panels on boats is more economical than using fuel and reduces noise pollution associated with generators.

The dependence on solar energy is rapidly increasing, and will continue to do so, as it is a more Eco-friendly alternative.

Several industries now use solar energy to fulfill some of their needs.

10 Best Sailboat Solar Panels Reviewed And Rated

We’ve compiled a list of the 10 best sailboat solar panels with their reviews for 2021.

Let’s go ahead and get started.

1. Powereco 100 Watt Solar Kit for 12V Battery of RV and Boats

The kit has a 100W monocrystalline solar module, 20A PWM charge controller, 20ft 12AWG cable with PV connector for connection of charge controller and a set of z-brackets.

It’s capable of withstanding high wind and snow loads.

It has a unique lightweight anodized aluminum frame, a reinforced safety and anti-reflection coated glass of 3.2mm thickness and waterproof rated IP-65 junction box which allows the panels to last years.

It can be expanded for a Max 300W and 200W systems i.e with two 100W solar panels in parallel for a 200W system and with three 100W solar panels in parallel for a 300W system.

The solar panel kit comes with pre-drilled holes for the screws and mounts required for RV and boat installation, it can also be used for other outdoor applications like camping.

Overall this system has very convenient installation, expandable power and climate resistant capabilities.

Pros & Benefits:

• Easy to install
• Weather Resistant

Check Amazon for Best Price!

2.   XINPUGUANG 100w Monocrystalline Solar Panel Flexible 200W 12V Solar System for RV and Boats

Its flexible solar panels are perfect for curved surfaces of a boat,sailboats, yacht, cabin, camper, tents, trailers, golf carts or any irregular surface.

Solar modules are durable and can withstand high wind-pressure, snow loads and extreme temperature environments.

It has maximum power of 100W and maximum system voltage of 700V DC.

It has encapsulation material with multi-tiered sheet laminations to increase the cell performance and provide a long life service.

This XINPUGUANG flexible solar panel is made of a high-efficiency monocrystalline cell.

It has a 19.6% convert efficiency, it can be bent 30-40 degrees which fits on an uneven surface, it can be installed on the curved surface.

It’s 80% lighter than glass, 3mm thickness makes it easy to carry, easy to ship, easy to install.

The solar panel is useful on yachts, boats, RV’s, caravans, electric cars, travel tourism cars, patrol cars, roofs, camping, roof power generations and marines.

Some wiring precautions:

1. The charge controller must first be connected to the battery, before it’s connected to the solar panels.

If the panels are connected in parallel, the voltage connected to the controller cannot exceed the maximum input voltage of the controller.

2. If the power rating of one controller is insufficient to reach all solar panels requirements, multiple controllers can be simultaneously connected to the battery.

The positive and negative attached to the controller and battery should be checked for precision, do not reverse the positive and negative poles.

3. The whole input power of the solar panel can’t be greater than the recommended power of the controller, otherwise, there is a risk of burning the controller.

The solar system kit connection is carved up into parallel connection or serial connection.

• Efficient System
• Flexible to use
• Multipurpose Usage

3. Mighty Max Battery 100 Watts 100W Solar Panel 12V – for RV and Boats

This product has a very sleek design,pre-drilled holes and a set of MC4 connectors which makes these panels portable and easy to carry.

It provides a complete solution for on-grid and off-grid locations.

Mighty Max panels are multipurpose and can be used for marine, camping, RV solar energy and many other on and off-grid applications.

It’s perfect panels are enough for charging up a 12V battery or connecting multiple panels in series for a 24V/48V off grid battery charging system.

It’s high efficiency solar cells are based on an innovative photovoltaic technology.

It comes with high efficiency solar cells based on innovative photovoltaic technology, which makes it more reliable.

It has a dimension of 41.5 x 28 x 2 inches, and it weighs at 19 pounds.

The package includes a MLS-100WP 12v, 18v and 100 watt polycrystalline solar panel, pre-drilled diodes in junction box with a pair of 35 inch cables with MC4 connectors already attached to the panel.

Mighty Max stands with its product and it’s performance. By buying this solar panel you are buying with confidence, to keep your electrical needs running.

Mighty Max panels have the capability of withstanding snow, rain, and strong wind loads.

Its compact and sleek design, alongside the pre-drilled holes makes it easy to carry and install on and off the grid without much hassle.

Pros & Benefits :

• Compact Design
• Efficient energy usage

4. Renogy’s 100 Watt 12 Volts Monocrystalline Solar Panel

It’s high in power but sleek in size. This 100W solar panel is perfect  for off-grid applications, like boats, sailboats, RV’s and Camps.

It comes with an IP65 junction box and waterproof MC4 connectors. It has dimensions of 47.0 x 21.3 x 1.4in and  weighs 16.5 lbs.

It has a maximum system voltage of 600VDC UL and the optimum operating Voltage of 18.9V.

It’s corrosion-resistant aluminum frame allows extended outdoor use as it can resist extensive weather conditions.

It has anti-reflective and low iron-tempered glass without any hot-spot heating.

It’s also compatible with other Renogy mounting systems, for example z-brackets, pole mounts and tilt mounts.

This Renogy’s product comes with a 25-year transferable power output and 5-year material and workmanship warranty.

It provides clean energy and excellent efficiency per space.

It gives guaranteed positive output tolerance 0-3% and withstands high winds and snow loads, as it can operate in extensive temperatures of -40°F to 176°F.

It has a maximum system voltage of 600VDC UL, open circuit voltage of 22.5V, short circuit current of 5.75A, optimum operating voltage of 18.9V and optimum operating current of 5.29A,

• Innovative technology
• Quality Material

5. Grape Solar GS-50-KIT 50W Polycrystalline Solar Panel

It can be expanded up to 3 total 50 Watt panels when used with Grape Solar 50-Watt panels with branch connectors.

It’s great for outdoor family picnics or parties.

It has an easy to read LED display on the charge controller which shows charging current, discharge current and battery reserve capacity.

It’s been made with high efficiency crystalline solar cells for much longer time of service.

This solar kit is very easy to install and virtually maintenance free.

The design and an anodized aluminum structure and a sealed junction box make the panel weatherproof for outdoor or off-grid use.

This installation will provide approximately 150-Watt Hours or 12.5 Amp Hours of charge per day.

This Grape Solar system includes a one piece Grape Solar GS Star 50 Watt solar panel, a 165 Watt Grape Solar Pulse Width Modulation charge controller and a USB output with Direct Current load control, cables and manual.

The solar panel is made of polycrystalline panel and anodized aluminum frames and tempered glass which leads to it’s outdoor superior performance.

It has dimensions of 26.1 x 1.38 x 24.4 inches and it weighs 14 pounds.

A minimum of 12-Volt deep cycle battery is compulsory to use this kit.

• It’s expandable
• Easy to read display
• Superior panel performance

6. WindyNation 100 Watt Solar Panel Kit Plus 1500W VertaMax Power Inverter for RV and Boats

It also includes a 100amp AGM Deep Cycle 12 Volt BattaMax Battery.

Depending on sunlight availability it will provide on average 400 Watt Hours (Wh) or 35 Amp hours of charge per day.

It’s a perfect kit for an off-grid 12 volt battery system.

It’s 1500 Watt VertaMax Inverter provides plenty of AC and power to run different household appliances.

This Kit can also be expanded, more batteries can be added in the future to increase power capacity of the system.

It’s designed for RVs, cabins, homes, sailboats, and for back-ups.

This WindyNation system includes everything you need to start producing free and clean power from the sun, it’s perfect for RV’s, sailboats, and cabins.

Purchase all the components together and save time and money, this package includes items and additional technical information, which makes it easy to install and operate.

All the required and connecting components come with the kit so purchase it together and save time and money.

• Technical support and easy to install
• Multi Usage
• System has easy and adjustable settings

7. ECO-WORTHY 100 Watt 12 Volt Monocrystalline Solar Panel Off  Grid Kit

It’s 100 Watt 12 Volt monocrystalline solar panel has maximum power 100W it has open-circuit voltage (Voc) of 21.6V, output tolerance ±3%.

It can operate at a temperature range of -40℃ to +80℃.

It uses a corrosion resistant aluminum frame for outdoor use, allowing the solar panel to last for years as well as withstand high winds  and snow loads, which is pretty good and reliable.

It has a size of 39.8*20.1*1.4 inch and weighs at 18.96 pounds.

It also includes mounting Z brackets, made of stainless steel material, and has a size of about 2.16*1.49*0.78 inch.

It can be fitted on solar panels installed on the RV, house, and sailboats.

The system comes with a charge controller that can handle up to 360W (12V system) or 720W (24V system).

System includes a 20A PWM LCD display controller which has a USB port,

It has a 12AWG solar cable with MC4 connector, both the red and black cables have a length of 16 feet each to connect with the solar panel.

It’s very easy to install, simple instructions are given and it can be installed in no time.

• All weather resistant
• Easy installation

8. ACOPOWER HY-4×12.5W 12V 50 Watt Portable Solar Panel Kit for RV, Boats and Camping

It is designed specifically for the customers who are new to solar.

The design of this kit is like a suitcase, which makes it portable.

Doesn’t matter if you are on the beach or going on your boat, the 50W PV suitcase would always be your portable power supply.

The package includes solar panels that can be folded, a charge controller, removable MC 4 connectors, a fuse and alligator clamps.

It has a phone charger as well but it will only work if connected with a 12V battery.

It has sunpower monocrystalline cells and has a conversion efficiency of 23.2%.

It’s simply extra portable with 5 lbs weight and 14*11.4*1 inches in size and it sets up in 10 seconds.

This kit gives two ways to satisfy your recharge need.

One is lithium battery, which connects the alligator clamps to the battery by red to positive and black to negative, then it starts charging.

The second way involves a generator, inverter battery with a built-in regulator controller, disconnects the MC-4 connector in 10 seconds, and use the generator’s MC-4 adapter to connect the suitcase by MC-4.

This product comes with an 18 months workmanship warranty from the delivery date, and has a 20 Years output warranty.

This product features ultra lightweight design (92 oz), laptop-like storage size of 14.2 x 11.4 inch.

It charges 12V lithium and acid batteries and provides a USB 5V output for phones or USB devices when connected to the battery.

It also has a removable charge controller for solar generators, inverter or power station or bank.

It’s weather-resistant, water-resistant and made of industrial-strength polymer lamination and comes with a 12 month worry-free warranty.

• Highly Portable
• Multi-purpose
• Outdoor Durability

9. Winnewsun Flexible Solar Bifacial Flexible Solar Panel 100W New Generation High Efficiency Solar Panel For Boats And RV’s

It consists of monocrystalline bifacial solar cells and it can generate power from both sides.

It’s an interesting and innovative thing that both sides of the flexible solar panel can generate power and it is beyond imagination that both sides(front and back) could even generate almost the same amount of power.

This system is quite different from conventional solar kits available in the market, which generate power only from the front side of the panel.

The power generated will depend on the reflective side from the back side, this type of flexible solar panel is very lightweight and portable and can be easily carried  anywhere.

It’s suitable for outdoor activities and can be widely used on RV,boats, marine or solar power system kit.

This system represents the highest efficiency in the current market and continues to improve annually.

It’s cell efficiency is up to 22%, the power loss for these solar panels is less than 3%, if we compare to the other conventional panels it’s around 10%.

Full package dimensions are 34 x 26.7 x 1.5 inches, and it weighs only 5.99 pounds.

This is a unique and innovative technology, having both sides of the panel generate power.

No conventional panels in the market offer the same technology.

The total weight of this solar panel is very low, and it’s perfect for outdoor usage as it’s very smooth to carry and install.

• Both side charging panel
• Highly Efficient
• Lightweight and Flexible

10. SUNER POWER 20 Watts 12V Off Grid Solar Panel Kit 

Decades of collective experience has helped in building SUNER POWER into one of the top solar solution providers in a very short time.

This particular solar power kit is perfect for a variety of off grid applications and it’s 12V batteries can be used as well as charge and to maintain cars, RVs, boats, trailer batteries.

System’s intelligent solar charging controller is built on an optimized charging algorithm and it’s three stages of charging make the system work in a more efficient manner.

This system comes with a cell control & work time setting.

Loads can be turned on in the morning and turned off in evening without manual operation.

You can set up to 13 working hours according to personal needs, it’s practical and useful.

This product comes with an extended 12 months warranty and lifetime professional technical support as well.

Full package dimensions are 17 x 13.4 x 1.6 inches and it weighs only 4.44 pounds.

It has a waterproof charge controller.

Kit includes plug & play SAE connector, and it’s very easy to install.

This 20Watt solar panel kit is designed specifically for people new to solar, the kit is great for off-grid installations, such as RVs,trailers, boats, CCTV monitors and cabins.

The panels are made of tempered glass which allows them to absorb more light and increases the power output 2% to 3%.

The kit comes with a 1-piece 20-Watt poly crystalline panel, an IP65 waterproof intelligent charge controller, a 3-piece cable kit, battery clamps, battery rings, bare wire cable, and a manual.

System involves an improved three staged charging algorithm, which helps better charge and maintain the battery.

It enhances the life of the battery, the system protects batteries fully in all seasons from over charging and short circuits etc.

• Multiple system protections
• Tempered Solar Glass
• Enhanced battery usage

Types of Sailboat Solar Panels

1. glass fronted panels :.

These panels provide more power for a very lower cost, and that makes them a more popular type of panels.

They further have two types, polycrystalline and monocrystalline.

2. Polycarbonate Panels :

These panels are the expensive ones and mostly use polycrystalline technology, these are mostly suitable for yachts.

3. Flexible Panels:

These types of solar panels are made of amorphous solar technology, the same technology which is used in calculators.

Given below are the 10 most popular solar systems to use for boats and other off grid applications:

Finding The Best Sailboat Solar Panels

Going on a picnic with family on a boat, arranging a party off the grid, or just having a time off, solar is the best energy option when it comes to off-Grid appliances.

Thanks to all the modern advancements, solar has become lighter and flexible.

We can even use the word portable for it as well, and hence it’s applicable everywhere.

Due to the multi roles of the solar panels more people are opting for solar energy even for home appliances and domestic use.

It’s simple and saves money, and that is the most attractive part.

Time is near when everyone will shift from conventional energy supplies towards solar energy.

Mentioned above are the top ten best options when it comes to sailboat solar panels.

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8 Best Solar Panels for Boats – Longer Adventures in the Sea

There aren’t many things worse than your boat battery running flat suddenly. Interestingly, you can prevent that kind of mess by opting for solar power—the sun’s inexhaustible energy.

However, going for solar power is not that simple, you’ll need the best solar panels for boats to call on. Unsurprisingly, there are many of them on the market but not all of them have what it takes to help you out.

Hence, we’ve tested the top-rated solar panels on the market based on their type, voltage, power output & current, dimensions & weight, cables & connection, and other features that make them ideal for boats.

In this article, we’ll recommend the solar panels we identified to be highly efficient and effective. Let’s get you to know all about the best solar panels for your boat!

• Quick Summary
• Editor’s Choice: Renogy 100-Watt 12-Volt Extremely Flexible Monocrystalline Solar Panel "Flexible monocrystalline solar panels that can withstand any weather conditions."
• Upgrade Pick: DOKIO 300W Portable Solar Panel Kit "If you need extra power multiplied by quality – these solar panels are right for you."
• Best Roof Solar Panel: Topsolar 100W Solar Panel Kit "Secure these solar panels on your boat’s roof and never worry about power use."
• Easiest Installation: RICH SOLAR 200-Watt Moncrystalline Solar Panel "This solar panel comes with all the parts needed to set it up securely on a boat."
• Best Value: RENOGY KIT-STARTER-100D "Fairly priced solar panel with Z-bracket mounting system and anti-corrosion frame."
• Best for Big Boats: Pikasola 200-Watt Solar Panel Kit "Solar panel kit for boats that require more power during trips."
• Most Durable Frame: Newpowa 200W Monocrystalline "If you tend to damage most solar panels during trips – this one can withstand most of the impacts."
• Best Polycrystalline Solar Panel: RICH SOLAR 200-Watt Polycrystalline Solar Panel "Polycrystalline solar panel for boats with reliable frame and waterproof exterior."

Top 8 Solar Panels for Boats Review 2024

Renogy 100-Watt 12-Volt Extremely Flexible Monocrystalline Solar Panel

• Dimensions: 48 x 21.6 x 0.08 in
• Max power output: 100 W
• Max voltage: 18.9 V
• Max current: 15 A
• Weight: 4.2 lbs
• Warranty: 25-year limited power output; 5-year material and workmanship

More features: monocrystalline , IP67 waterproof rate, operating temperatures of -40°F to 185°F

Sitting atop our list of the best marine solar panels is the Renogy Flexible Solar Panel. Made from advanced polymer materials, this panel is lightweight. Unlike traditional solar panels that are typically rigid, this product is extremely flexible, making it versatile.

Besides, the Renogy Flexible Solar Panel is a monocrystalline panel that’s designed for off-grid applications. That means you can use the panel to power your boat. This product is also ideal for RV, rooftop, and any curved surface, thanks to its flexibility. This unique flexibility makes the panel one of the best flexible solar panels for boats.

• The Renogy Flexible Solar Panel is not short of positives. First of all, we liked that the panel is designed to withstand excessive wind of up to 2,400 Pascals (Pa) and snow loads of up to 5,400 Pa. Additionally, the panel boasts a waterproof rating of IP68 that makes it ideal for outdoor use. Furthermore, we liked the solar panel’s moderate design that makes it one of the best small solar panels for boats.
• The biggest issue we discovered with the Renogy Flexible Solar Panel is the absence of grommets or holes in the corners. Expectedly, the absence of holes makes it difficult to secure the panel on a boat. When testing the equipment, we had to part with a few more dollars to buy an adhesive to install the panel. The presence of holes or grommets could make life easier for sailors.
• Our 2 pick for the: best flexible solar panel
• Our 4 pick for the: best 100 watt solar panel

DOKIO 300W Portable Solar Panel Kit

• Dimensions: 22.2 x 1.1 x 85 in (unfolded)
• Max power output: 300 W
• Max voltage: 18 V
• Max current: 16.67 A
• Weight: 17 lbs
• Warranty: 5-year limited on material and workmanship

More features: 2 UDB ports, carrying bag included, IP65 waterproof

The DOKIO 300W Portable Solar Panel Kit features nearly everything you want to make your equipment deliver power. From the main panel to the solar charger, this product works out of the box. Despite packing 300W of power, the panel is only 0.9-inch thick, making it easily foldable.

If you’re looking to upgrade the old panel on your boat, the DOKIO 300W Portable Solar Panel Kit seems like the perfect choice. It boasts a monocrystalline solar cell that produces greater power efficiency than most traditional models. Apart from being ideal for boats, this panel works for RVs, trucks, vans, and trailers too.

• The DOKIO 300W Portable Solar Panel boasts a unique design that’s full of power, yet lightweight and foldable for easy installation. The kit contains a solar charger that works with 12-volt batteries. Also, this charger protects against overcharging, short-circuit, and overloading. Moreover, the panel has a wide range of applications, including boats, trucks, trailers, RVs, etc. Finally, it's certified safe with CE and ISO certifications.
• Did we mention that the DOKIO 300W Portable Solar Panel Kit comes with a controller? Yes, it does. But, it didn’t impress us. It gets quite hot during operation. To be fair though, the manual warns that the controller can get hot and temporarily shut down itself to cool and start up again. In our opinion, the controller's engineering could be better to make the controller more efficient.

Topsolar 100W Solar Panel Kit

• Dimensions: 46.5 x 21.8 x 1.37 in
• Max voltage: 24 V
• Max current: 20 A
• Weight: 15 lbs

More features: IP65 waterproof, corrosion resistant frame, 2400 Pa static load, 23m/s wind resistance

The Topsolar 100W Solar Panel Kit comes with an intelligent charge controller and a panel made with high-efficiency monocrystalline solar cells. A heavy-duty anodized, corrosion-resistant aluminum frame and tempered glass coating protect the panel from wear and weathering. The kit also includes extension cables and mounting holes.

If you’re looking for the best roof solar panel, you might not get better than the Topsolar 100W Solar Panel. Not only is this sailboat solar panel kit built to withstand harsh weather conditions, but it’s also equipped with a bracket that adapts the mounting angle for excellent sunlight reception.

• One of the things the Topsolar 100W Solar Panel has going for it is its heavy-duty frame. The aluminum frame is corrosion-proof and features a coating shield that shields it from wear and harsh weather. Also, we liked the kit's intelligent charge controller that protects your boat’s batteries from overcharging, short circuit, and discharging. Finally, we liked that the kit comes with a mounting bracket, cables, and other tools that ensure a seamless installation.
• There’s hardly anything to complain about when it comes to the Topsolar 100W Solar Panel but the packaging could be better. Our panel’s aluminum frame came dented in a few places. In our opinion, the packaging doesn’t include enough interior packaging materials to protect the panel. Without question, the poor packaging can be a deal-breaker for some sailors, so it could be better.

RICH SOLAR 200-Watt Moncrystalline Solar Panel

• Dimensions: 58.7 x 26.8 x 1.4 in
• Max power output: 200 W
• Max voltage: 24.3 V
• Max current: 10.2 A
• Weight: 26.5 lbs

More features: 14 pre-drilled mounting holes, anodized aluminum frame

The RICH SOLAR Monocrystalline Solar Panel sports a durable and heavy-duty design. It is built with an anodized aluminum frame and strong high-transmission tempered glass. Also, the panel is designed to perform on mornings, evenings, and cloudy days, when the sun isn’t forthcoming.

If you want a solar panel that installs easily and quickly on your boat, the RICH SOLAR Monocrystalline Solar Panel is your guy. It comes with quick-connect cables, 14 pre-drilled holes, tilt mounts, side pole mounts, and Z-brackets to ensure easy installation.

• Installing the RICH SOLAR 200 Watt Monocrystalline Solar Panel is a breeze. The panel comes with everything you need for a seamless installation. Also, it boasts great low-light performance on mornings, evenings, and cloudy days. Furthermore, the panel's anodized aluminum frame and coated tempered glass make the equipment durable. If you’re not sold on this product yet, the 25-year limited power output warranty should convince you.
• Although the RICH SOLAR Monocrystalline Solar Panel is quite efficient, the packaging is not good enough and can cause problems. The poor packaging means some panels come damaged on the frame. While the product can be returned, it doesn’t make the disappointment of having damaged frames less painful. Surely, the packaging could be better to make the panel more attractive to buyers.

RENOGY KIT-STARTER-100D

• Dimensions: 20 x 42.4 x 1.38 in
• Max current: 30 A
• Weight: 14.3 lbs

More features: anti-corrosion frame, IP65 waterproof, drainage holes, Z-bracket mounting system, operating temperature -40°F to +185°F

The Renogy KIT-STARTER-100D features a corrosion-resistant aluminum frame that makes it suitable for outdoor use. As a matter of fact, the frame can withstand high winds of up to 2,400Pa and snow loads of up to 5,400Pa. Also, the equipment supports lithium batteries, gel batteries, and lead-acid batteries.

If you’ve got a small budget and you still want a reliable solar panel for your boat, the Renogy KIT-STARTER-100D is made for you. At a relatively low price, you get almost everything you need to power your boat. From the solar charge controller to the pre-drilled holes, life’s easier as a sailor with this solar panel kit.

• The Renogy KIT-STARTER-100D comes with a solar charge controller that improves system performance and increases battery life. Plus, it prevents your boat's battery from overcharging, over-voltage, short circuit, and discharge. Also, the panel features plug & play cables and pre-drilled holes that allow quick installation. Besides boats, this equipment has many other applications, including trailers, cabins, sheds, RVs, etc. Furthermore, the product offers a 5-year warranty.
• Installing the Renogy KIT-STARTER-100D could have been easier for us if both ends of the cables were labeled. Only one end of the cables is marked as “+” and “-”, making it difficult to know which is which. If you’re not very lucky, you may spend several minutes trying to figure things out. Another concern is the controller’s poor connection that allows cables to pop out sometimes. Surely, the connection could be better.

Pikasola 200-Watt Solar Panel Kit

• Dimensions: 36.3 x 26.4 x 1.2 in
• Weight: 31.9 lbs
• Warranty: not specified

More features: corrosion-resistant frame, IP65 waterproof, LCD screen, Z-bracket mounting system

The Pikasola Solar Panel Kit contains several important components, including a monocrystalline panel made from a highly efficient solar cell. The panel’s toughened glass and corrosion-resistant aluminum frame help it to withstand high snow loads and winds. Also, there’s an IP65 Waterproof Junction Box that protects against environmental particles.

Moreover, the Pikasola Solar Panel is expandable to a maximum power output of up to 240W (12V) or 480W (24V), making it perfect for big boats. So, if you’ve got a big boat, you know the panel to consider. Also, the kit features an LCD that makes the panel easier to use on your solar power sailboat. With its enormous power, this panel could pass as one of the best yacht solar panels.

• The Pikasola Solar Panel Kit contains everything you need to get a big boat going. It features a 12V/24V system that allows you to expand the panel up to a maximum of 240W (12V) or 480W (24V). Also, the solar charge controller offers multiple protections, including overcharge, discharge, short circuit, overload, and reverse connection. Furthermore, the panel features pre-drilled holes and mounting Z brackets to make installation a seamless exercise.
• The Pikasola Solar Panel's cables are a bit too short and cause problems during installation. To test the panel to our satisfaction, we had to buy extension cables that are long enough for installation. Of course, this cost us extra dollars. As if that wasn’t enough, there was the concern of losing wattage due to the extension cables. We couldn’t confirm this concern but it shouldn’t have been if the included cables are long enough.

Newpowa 200W Monocrystalline

• Dimensions: 64.57 x 26.57 x 1.38 in
• Max voltage: 17 V
• Max current: 11.76 A
• Weight: 27.56 lbs

More features: 2400PA wind resistance, withstands 5400PA snow loads, IP65 waterproof

The Newpowa Monocrystalline Solar Panel and its junction box are protected from water splash (IP65 waterproof rating) and common weather conditions, including high winds and snow loads. On top of that, this panel features multi-layered sheet laminations that improve cell performance and ensure durable service life.

Furthermore, the Newpowa Monocrystalline Solar Panel features a heavy-duty anodized frame that offers robust protection for the structure. In terms of longevity, this panel boasts the most durable frame you can buy to power your boat for several years. A 25-year transferable power output warranty guarantees that.

• One of the most important qualities you want in the ideal solar panel for your boat is weather protection. The Newpowa Monocrystalline Solar Panel doesn’t disappoint in this area. It’s designed to withstand high winds (up to 2,400Pa) and hail & snow loads (up to 5,400Pa). Best of all, this equipment features a heavy-duty anodized frame that provides durable strong protection for the structure. We also liked the multi-layered sheet laminations that enhance cell performance.
• If you’re thinking about installing the Newpowa Monocrystalline Solar Panel out of the box, you’ve got another thing coming for you, sadly. The panel doesn’t come with brackets for installation. Unfortunately, the manufacturer doesn’t indicate that buyers will need to buy brackets separately since some manufacturers offer them. In our opinion, this situation could be handled in a better way, either by providing brackets or indicating their absence.

RICH SOLAR 200-Watt Polycrystalline Solar Panel

• Dimensions: 39.6 x 26.4 x 1.4 in
• Max voltage: 22.6 V
• Max current: 5.41 A
• Weight: 17.5 lbs

More features: 3 ft cable, 14 pre-drilled holes, anodized aluminum frame

The RICH SOLAR Polycrystalline Solar Panel rounds off our review of the best sailboat solar panels. It boasts a multi-layer protective system and solar energy chips that maintain efficient energy conversion. On top of that, this panel features an anti-reflective and low iron tempered glass and an IP65-rated junction box that protects it against environmental particles.

You’ve seen a lot of monocrystalline solar panels already, but the RICH SOLAR Polycrystalline Solar Panel provides a glimpse into what polycrystalline panels look like. It works with 36 efficient polycrystalline solar cells that deliver excellent performance. So, if you’re looking for the best polycrystalline solar panel for your boat, this product may be suitable for you.

• The RICH SOLAR Polycrystalline Solar Panel has some interesting positives, including the 36 efficient polycrystalline solar cells. Plus, the junction box provides reliable protection against low-pressure water jets and other environmental particles. Furthermore, the panel is quite versatile and has many applications, including boats, RVs, etc. Also, this equipment comes with quick-connect cables, Z-brackets, tilt mounts, side pole mounts, and 14 pre-drilled holes that fit with ground mounts.
• While the RICH SOLAR Polycrystalline Solar Panel comes with pigtail wires that make installation convenient, the connection pulls out easily. As far as we’re concerned, the poor connection shouldn’t be. Although you can solder the connection, it could be better. Also, the panel’s ability in cloudy conditions is not so assuring, with power output usually dropping. The design could be better to ensure that panel works well in tough conditions.
• Things to Consider

With hundreds of solar panels on the market, picking out the best solar panels for boats can be quite challenging. But the task can be less challenging if you know the right places to look. We’ve developed a comprehensive buying guide that contains every piece of information you need to choose the ideal panel for your boat. Read on to learn all about the secrets we have in store for you.

• How to Power Up a Boat with a Solar Power

After buying your preferred solar panel, the next step will be powering your boat with the equipment. If you don’t have any idea how to make this happen, this video provides an in-depth explanation of what to do:

Types of Marine Solar Panels to Consider

As you’ve probably noticed already, there are two main types of marine solar panels to consider; Monocrystalline and Polycrystalline.

• Monocrystalline

As the name of the monocrystalline solar panel hints, it is made from single crystal of silicon Trusted Source Monocrystalline Silicon Cell - an overview For monocrystalline Si cells, it is imperative that a thin layer of dielectric like SiO2 or Si3N4 be deposited on the Si to reduce surface recombination and improve the electrical properties of the device. www.sciencedirect.com . Manufacturers slowly grow these crystals into ingots of significant size, after which they cut them into individual solar cells. They assemble the cells into panels once the process is over. These panels’ uniform structure makes them have the highest efficiency among all types of solar panels.

While monocrystalline solar panels are quite efficient, they don’t come cheap.

• Polycrystalline

Unlike monocrystalline solar panels, polycrystalline cells are made up of many tiny silicon crystals. The manufacturing process involves melting many silicon fragments Trusted Source Monocrystalline vs Polycrystalline Solar Panels When it comes to solar panels, one of the most asked questions is which solar cell type is better: Monocrystalline or Polycrystalline? ases.org which are poured into a mold afterward. While this process tends to be cheaper, it causes lower efficiency.

Many sailors go for polycrystalline solar panels because they provide a decent efficiency for a lower cost, which can be smart, especially if they have a small boat.

How to Pick the Best Solar Panels for Boats

Below, as promised, we’ll dissect the factors you must consider to pick the best solar panels for boats:

Before choosing a solar panel for your boat, you should know its maximum voltage output. A typical 12-volt panel generates a maximum terminal voltage of around 17 – 20 volts in full sunlight without a connected load.

In case you didn’t know, the panel’s voltage directly affects the equipment’s power output, so you must choose a product that offers high voltage. You can opt for a panel that offers as low as 18 volts like the Renogy Flexible Solar or go for the Topsolar Solar Panel’s 24 volts.

• Power output and current

The power output of a solar panel is perhaps the most important part of the equipment. But that’s as important as the maximum current. You’ll have to consider these two factors before opting for a panel.

Measured in watts, the power output determines how much power you get from the panel. If you need the equipment to power electrical appliances on your boat, you’ll need a product that offers between 100 and 200 watts like the RICH SOLAR Monocrystalline Solar Panel .

If you’re living on the boat, you’ll need a solar panel that offers between 250 to 350 watts. The DOKIO Portable Solar Panel boasts a power output in that region and can be a great asset for sailors who want to power as many electrical appliances as they need. Overall, you should choose a panel that suits what you need.

• Mono or Poly-crystalline

By now, you know that you have to choose between monocrystalline and polycrystalline solar panels for your boat. There are two considerations here; efficiency and cost. As we explained earlier, monocrystalline panels are more efficient than polycrystalline panels but the former is more expensive than the latter.

If you care more about efficiency, you should choose a monocrystalline model like the Pikasola Solar Panel . However, if you place a premium on cost, a polycrystalline variant such as the RICH SOLAR Polycrystalline Solar Panel will work for you. Eventually, you should choose the type that best suits your preference.

• Dimensions and weight

Another factor you can’t dismiss when looking to buy a solar panel for your boat is the size. You’ll have to consider the dimensions and weight. If you have a small boat, you’ll need a small and lightweight panel like the Renogy Flexible solar panel . However, if your boat is big, a panel like the Newpowa 200W Monocrystalline can be a suitable choice.

Before you choose a solar panel for your boat, ensure that it has the right size and is not too heavy for your vessel.

• Cables and connection

You should never choose a solar panel for your boat without considering the included cables and connectors. Frankly, not all panels come with these important components. Their absence usually puts buyers through the hassle of buying them separately, which is not cost-effective.

Therefore, we recommend that you only buy a panel that comes with cables and connectors. Most solar panel kits usually include these components. The Renogy KIT-STARTER-100D and Pikasola Solar Panel Kit are good examples of such kits.

• Extra features

Beyond the major features, there are extra features you should look out for in a solar panel before going for it. One of those features is waterproof design. You can’t afford to install a panel that’s not protected against water damage on your boat. Unsurprisingly, top products such as Renogy Flexible Solar Panel and Newpowa Monocrystalline Solar Panel offer protection against water.

These products also provide snow and wind resistance; another important feature you have to look out for. Lastly, you should check a panel’s operating temperatures and ensure it can work in even low temps before buying it.

• Durability and warranty

You can’t mess around about durability; it’s very important. Solar panels are not cheap, so you must ensure that you buy a durable product. You should ensure that the product boasts the best materials and cells. As an extra protection, you should opt for a panel that offers an attractive warranty.

For example, the Renogy Flexible Solar Panel and the RICH SOLAR 200-Watt Polycrystalline Solar Panel offer a 25-year limited power output and a 5-year material & workmanship warranty. You’ll hardly get a better warranty than the ones these products offer.

• Which is the best solar panel for big boats?
• How to control marine solar panel charge?

If your panel doesn’t come with a controller, buy it separately to protect your battery life.

• How do I clean sailboat solar panels?
• Can I connect solar panels directly to solar generators?
• Our verdict

Marine solar panels use the natural and free energy of the sun to make boats entirely self-sufficient, which is pretty cool. We’ve reviewed 8 top panels in this article with the Renogy Flexible Solar Panel emerging as our editor’s choice for many important reasons. This panel is designed to withstand excessive wind and snow loads, is waterproof, and boasts a flexible design that makes it quite versatile.

Breathing down this product’s neck is the DOKIO 300W Portable Solar Panel – our upgrade pick that boasts enormous power output for sailors living in their boats. It also features a charge controller that protects battery health. Taking the crown as our value pick is the Renogy KIT-STARTER-100D – a solar kit with several components to get the panel started.

Without question, there’s no lack of fantastic choices among the best solar panels for boats, but you should choose the product that serves your needs.

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