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Electric Sailboat Motor: Range, Cost, Best Kits for Conversion

Today, owning a completely green sailboat has been made possible with electric sailboat motors.

Imagine cruising with the silence of an electric sailboat motor and the ease of use with a simple press on the start button. What’s better is there are no exhaust fumes at all with significantly less maintenance.

It’s so appealing that a lot of sailing liveaboards have made their electric sailboat motor conversion.

However, some sailors are still on the fence, worrying about the range and price of the electric sailboat motor.

If you are one of them, you are in the right place!

This post will guide you through every aspect you need to know about electric sailboat motors to help you make an informed decision.

Besides, you will get professional insights on how to make the electric sailboat motor conversion for your own boat and learn the best electric sailboat motors (with honest reviews).

Table of contents:

• Electric Sailboat Motors: Confusion Explained

Electric Sailboat Motor or Combustion Motor

• Electric Yacht Motor Conversion: Two Solutions
• How to Size an Electric Sailboat Motor

Best Electric Sailboat Motors (with Reviews)

Electric Sailboat Motor: Confusion Explained

Can you go cruising with an electric sailboat motor? Can you put an electric motor on a sailboat? Are there any limitations?

Whether electric sailboat motors are a good fit for your boat is not a YES or NO question. Here we will explain your top worries with statistics and facts. That way, you can make a wise decision according to your situation.

You may hear some complaints about the batteries and range of the electric propulsion.

However, their experience may not suit electric sailboat motors.

In fact, even small electric engines work pretty well in many sailboats. That’s because most of the time, the wind can power the boat, and the motor is just used for docking or in rare times when there is no wind.

Therefore, it makes more sense to learn electric sailboat motor performance in real-world applications.

Here is a test report of a 3 HP electric sailboat motor on an RS21 racing sailboat:

As you can see, the small electric sailboat motor can run at 5.5 mph top speed for one hour continuously.

And there is a big difference in terms of range vs speed for electric sailboat motors:

If you lower the speed, the range and runtime can be greatly extended. The slower you go, the further you’ll get. For example, if you cut your speed in half, the electric sailboat motor can last 7 hours and go 20 miles within one charge.

That’s pretty sufficient if you use the electric yacht motor mostly for docking or as an auxiliary engine.

Faster top speed (and more range) is available with higher power electric sailboat motors depending on your specific requirements. Contact a specialist to design your electric sailboat motor solutions.

Also, don’t forget to get the electric sailboat motor with regeneration (See recommendations below).

That’s to say, when there is a lot of wind and you’re moving rapidly via your sails, they regenerate and store electric power on the batteries to keep you moving at other times. Solar recharging is also a plus.

Essentially, the range depends on how many batteries you have, so it’s not a limitation of electric sailboat motors but energy and batteries.

If you are still worried, you can offset this by getting a diesel generator, which is more efficient than a diesel engine. And it is a range extender when you need it, but for 90% of your motoring that you don’t need the range, you can rely on the electric sailboat motor.

Some of you might be concerned about the extra weight of the batteries.

In fact, an electric sailboat motor with lithium batteries weighs less than a diesel engine, particularly if you include the fuel weight.

If you want a lightweight electric sailboat motor solution, make sure you get one with LiFePO4 batteries . Compared with other marine batteries, they are more compact in design with much less weight and higher energy density.

Some more advanced electric motors for small sailboats (such as Spirit 1.0 Evo) feature an integrated lightweight battery. So you don’t need to worry about the complex wiring to hook it up or extra space to store the battery.

This is a huge plus if you want to use the electric sailboat motor on a tender or dinghy.

Here is also a chart that collects the weight of some popular electric sailboat motors for your reference:

For many people, another big problem with electric sailboat motors is the cost.

It’s true that a gasoline outboard with similar power is a lot cheaper to buy. However, the electric sailboat motor eventually wins in long-term operating cost. That’s especially the case if you are going to do a lot of motoring.

Electric sailboat motors save on fuel and maintenance costs, which can build up to a large amount over time.

Here is a chart that compares the cost of a 3HP electric sailboat motor (coming with a built-in battery) with its combustion counterpart:

That’s to say, you will cover the price difference for electric yacht motors eventually as long as you use it long enough. Click to check the details of the calculation .

What makes the electric sailboat motor even more worthwhile is it saves you a lot of hassles, especially for sailors who only use the engine in and out of the harbor. Dealing with the maintenance of the gas outboard for a 10 minute motor out of and into the harbor is disproportionate and painful.

*The higher horsepower electric sailboat motor may be different in terms of the cost calculation. Check out the outboard motor pricelist by HP for more information.

As you may have already noticed, electric propulsion has already been widely used in the marine industry:

It’s quiet while motoring, clean to handle, environmentally friendly, with less maintenance and operation costs.

The electric sailboat motors are easier to use with dramatically fewer moving parts to break and no worries about being a diesel mechanic to deal with the hard pulling start. You can have it always on, so it is ready whenever you need it.

And it makes even more sense in sailing applications:

You don’t really need to motor much if your plan is to actually sail. If you are completely becalmed, you will probably just need to motor at 2 knots to keep making way, which is easy for electric sailboat motors.

If you mostly use the motor to get into and out of the harbor, the electric sailboat motor also works great for you.

You can always charge up at the dock, motor out of the marina (or even motor to your sailing area or race start), then hoist the sails and when you’re through, the batteries are charged again.

The electric sailboat motor is also useful as a backup (kicker) motor in case your system goes down. That’s why you can see people pushing a lot of big boats with small electric motors. (Click to learn more information about kicker motors .)

Personally, it’s really nice to have an electric auxiliary in the boat – no smelly, messy diesel and motor oil to deal with, a much simpler system with less maintenance, and much, much quieter operation.

However, powerboats tend to have much higher requirements in terms of both power output and runtime. In that case, an electric sailboat motor can be hard to satisfy your needs.

How Do You Size an Electric Motor for a Sailboat?

As a rule of thumb, you will need approximately 1 HP per 550 lb of the displacement of your boat.

Generally speaking, a 3 HP electric sailboat motor can push a sailboat up to 25 ft and a 9.9 HP motor is sufficient for a 30 ft sailboat to motor at a satisfying speed.

However, bear in mind the horsepower you need always depends on your needs and applications.

It’s better to check the data from real-world tests to decide whether the electric sailboat motor is suitable for your specific needs.

For example, the 9.9 HP electric sailboat motor Navy 6.0 allows you to go at 6.9 mph (11.1 kph) on a 30 ft sailboat, and the range can be extended to 46.4 miles if you decrease your speed to 2.9 mph (4.6 kph).

Click to see more test reports with other electric motor and sailboat combinations, and find the electric sailboat motor that suits you best.

If you are still not sure about the size of the electric sailboat motor for you, feel free to leave us a comment and we will get back to you ASAP with professional suggestions.

Electric Sailboat Motor Conversion

Basically, there are two ways for you to convert your sailboat to a clean and quiet electric drive system:

You can either convert your current vessel to electric or buy an engineless yacht and install an electric sailboat motor on your own.

#1. Repower Your Sailboat with Electric Motor

If you decide to replace the diesel engine with an electric motor, you will need to do a lot of preparations:

The DIY approach requires an electric sailboat motor kit (including motor and controller), batteries, a good level of mechanical ability and basic electrical knowledge, as well as some common tools such as a voltmeter.

You will need to take the old engine out for the new electric sailboat motor installation. It’s not an easy task that involves removing the engine mounts and the drive shaft (dealing with the numerous hoses and cables), taking out the engine, exhaust system, fuel tank, and its attendant tubes, etc.

Remember to balance the boat to avoid listing during the electric sailboat motor conversion.

Then in with the new electric sailboat motor. The installation process can be straightforward if you choose the electric sailboat motor kit wisely (See steps below). Furthermore, you can set up solar charging for your electric sailboat motor with solar panels and charger.

Many sailors have recorded their electric sailboat motor conversion process and experience. Be sure to check them out to get some inspiration. For example, Ed Phillips has documented everything which can serve as a guide for newbies to get started.

Mind you there can be a whole heap that can go wrong in designing and maintaining the electric sailboat motor systems. You really need to be totally on top of it if you want decent performance or reliability.

If you are not that technically inclined, it’s better to talk to a specialist first to discuss your plan for a smooth electric sailboat motor conversion.

#2. Install an Electric Motor in a Sailboat

If you own an enginless sailboat, the electric sailboat motor conversion is much easier for you.

All you need to do is to find a reliable electric sailboat motor and install it in simple steps. The whole process can be easily done, even for beginners. Here we take the popular 6 HP electric sailboat motor Navy 3.0 as an example to show you the installation process:

• Step 1 : Rotate the clamps or use the screws to fix the outboard onto the sailboat.
• Step 2: Mount the steering system in the proper position.
• Step 3: Install the tiller on the electric sailboat motor.
• Step 4: Connect the batteries to the electric sailboat motor system.

Click to check the video tutorial that guides you through each step of the installation.

If you are worried about aesthetic issues and want higher horsepower options, an electric inboard motor can be a better suit for your sailboat. If you prefer an inboard motor for your sailboat, contact our OEM team to get an electric propulsion solution tailored to your needs.

Note : You might find some electric trolling motors rated by #s of thrust on the market. Actually, those electric trolling motors for sailboats can only provide limited speed and range. If you are heading into the wind, the trolling motors for sailboats are definitely not an ideal solution.

Once you’ve evaluated if electric sailboat motors are right for you, there are a lot of options for electric systems.

Here are some popular electric sailboat motors with positive reviews from customers worldwide. Fast charger is available for all the models recommended to reduce your charging stress.

#1. 3 HP Spirit 1.0 Evo

If you are looking for an electric motor for a small sailboat, be sure to check out the ePropulsion Spirit 1.0 Evo. It’s suitable for large daysailers or small cruising sailboats under 25 ft.

With the Spirit 1.0 Evo electric sailboat motor, you can go 5.5 mph (8.8 kph) at top speed on the 21 ft RS21 sailing boat, or troll for 20 hours continuously at 2.2 mph (3.5 kph) according to our test .

This electric sailboat motor with regeneration allows you to recover energy from the prop while under sail. It will start to generate power automatically when the sailing speed reaches 2 knots.

As an electric auxiliary sailboat motor, it can also be easily installed on your tender boats or yacht dinghies since it’s portable and easy to transport (with a lightweight integrated battery).

Features You Will Love:

• Come with the industry-first hydrogeneration capability
• Direct-drive technology makes it maintenance-free
• Portable with a 1276Wh large integrated lithium battery for long range
• Safety wristband keeps you safe in case of MOB
• Digital operation keeps you informed of the battery status

Spirit 1.0 Evo Electric Sailboat Motor Reviews:

“Great weekend with my 17′ sailboat powered by the Spirit Evo. This is great. Quiet and reliable. Went at 3/4 throttle for about 1.5hrs when taking it back to boat ramp.” – Robert Taylor

“Very happy with our Spirit Plus. Pushing our Kolibri 560 a 750 Kg sailboat, with ease. Doing about 5.8 km/h at 500W.” – Frank van Asten

#2. 6HP/9.9 HP Navy Evo Series

If you want a little more juice on the electric sailboat motor, check out the ePropulsion Navy Series. It offers 6 HP and 9.9 HP models for your selection and it provides sufficient power for sailboats up to 30 ft.

According to our test , the 6 HP electric motor Navy 3.0 can push the Catalina 25 sailboat (25 ft) at 6 mph (9.6 kph) top speed, while the Olga 33 sailboat (33 ft) can go at 7.5 mph (12 kph) with the 9.9 HP Navy 6.0 motor.

The Navy series electric sailboat motor also comes with regeneration features which can be recharged with hydrogeneration, wind turbine, and solar panel.

• Four controls to fit your sailboat installation and your boating style
• Accompany LiFePO4 batteries (need separate purchase) are more energy efficient
• Digital display offers real-time monitoring of the power and battery
• Magnetic kill switch and safety wristband keep you safe on the boat
• Electric start saves you trouble pulling the cord to start

Navy Series Electric Sailboat Motor Reviews:

“I have a Navy 3.0 with E80 on a Catalina 25 sailboat. It is working well. Currently I am using about 4% battery to go in/out of the marina by boat.” – Aaron Young

“Just finished my 8 weeks sailing journey in the Baltic Sea. The two Navy 3 outboards provide enough power for my 33ft catamaran. The 400W solar panels provided enough energy for engines and all other energy consumed on board with 2-6 persons. The two Navy Batteries provide power for engines and all other on-board electric devices. I never had to use shore power, so totally self-sufficient electric system.” – Martin Hildebrand

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Eliminate noxious diesel fumes, the cost of filling up at the pump, and enjoy your sailboat to the fullest with this DIY electric conversion Kit. The 10KW Brushless Kit features a Motenergy brushless motor and a 48V 450 Amp Sevcon Gen4 Controller that can produce up to 10KW continuous, often used to replace 30hp combustion engines!  This system is best for boats up to 12,000 pounds displacement.

All our systems have reverse on-the-fly and contactor disable features. "Brushless" means that the motor does not have brushes that will wear out over time, nor will it be a dangerous source of ignition for on-board gas appliances. Larger boats may require a higher power AC or brushless motor. In the U.S. and Canada, brushed motors are only legal for marine use if onboard appliances and accessories use kerosene or diesel (not propane or gasoline) due to the potential for internal motor arcing.

The controller has a regen feature than can allow current to be put back into the batteries from the spinning prop while under sail. This depends on your sailing speed, prop design, and may not be possible in all applications, but is an adored feature for those who are able to use it.

Due to the high RPM of the brushless motor, we recommend the 5-10kW Gear Reduction to improve efficiency, provide proper torque, cooling, and help prevent cavitation. A typical reduction is 2:1, but this ratio will depend on the required prop RPM needed to reach hull speed. Ideal reduction will enable the motor to spin your prop at the hull speed RPM of your prop when the motor is spinning at its max RPM. The 10kw kit spins at 2700 RPM max by default.

What batteries should you use? Most customers are happy with sealed, deep cycle lead acid, sourced locally to save on shipping. Use 4 in series to get 48v, with a 100 Amp Hour capacity minimum. Larger capacity will give a longer run time.

* If you choose not to use a gear reduction, a thrust bearing in line with the prop shaft is required, since most motors are not rated for axial/thrust loads on the shaft. 

* Before you pull your old engine, support the prop shaft for reference so you can properly align the new system.

* A heatsink for the controller is recommended by the manufacturer, and is included in the kit.

Check out our instructional wiring video!

You may also be interested in the CAN Translator

Those of you that are still in the "research phase" of your conversion should visit one of the  Electric Boats Discussion Groups  and talk to others who are doing or have already done electric conversions.

Sevcon Sailboat Kit Installation Instructions

Sevcon Sailboat Wiring Diagram with ET throttle

Sevcon Sailboat Wiring Diagram with Wigwag throttle

E-Boat Modeling Spreadsheet (.xls) *Use this to calculate your power needs*

E-Boat Modeling Spreadsheet Manual (.pdf)

Vicprop Calculator

Mechanical Drawing

Sevcon Gen 4 Controller Info

Included Components  (may vary based on kW rating and parts availability)

• Motenergy ME1115 Dual-Stator Brushless Motor.
• Controller: 48V Sevcon Gen4 G4845
• 827 Display for Sevcon Controllers
• ET-134/126 directional throttle . Recommended if you plan to use an existing throttle lever. Use the ET Actuator to connect to your existing throttle cable. ET-134 has a Neutral Detent, ET-126 has Spring Return. 
• Wigwag throttle lever if not reusing your existing lever
• Sealed Main Contactor
• Finned Aluminum Heatsink
• Every kit is individually bench tested
• Complete wire harness with 10ft key and throttle cable lengths
• Wiring instructions

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Practical Boat Owner

• Digital edition

Electric sailboat conversion: How my Parker Super Seal went zero-emissions

• Ed Phillips
• April 5, 2022

Ed Phillips embraces zero-emissions sailing by ditching the diesel and converting his Parker Super Seal into an electric sailboat.

Electricity is generated by the engine hydrogeneration system when sailing

Aiming to do our bit for the environment, we recently made a number of lifestyle changes – and one of them was converting our Parker Super Seal yacht into an electric sailboat with the use of an ePropulsion electric motor.

It has proved a great transition in so many ways, taking our sailing experience to the next level. At first it felt a scary, big step into the unknown, but in fact proved a relatively straightforward job.

Skylark is our eco Parker Super Seal. She is an accomplished sailing boat, quick, safe, and fun. She is a joy to sail, we regularly achieve over eight knots through the water.

Our cruising range is generally the South Coast between the Solent and the West Country plus the Channel Islands and France. We have aspirations to take her round Britain , we just need to prioritise the time.

Skylark is primarily powered by sail, a main and genoa (140%) and a couple of asymmetric spinnakers.

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Leap of faith

Last winter we took the big decision to convert Skylark from diesel to electric propulsion. So her motor is now a 6kW electric engine, with a 9kWh lithium battery, both made by ePropulsion. Leisure power is supplied by Totalcool 12V lithium batteries and solar panels .

Was it a crazy or brave step? Well, somehow taking a perfectly serviceable engine out and going to an emerging technology seemed quite scary, especially when it involved drilling holes through the bottom of your own boat.

Interestingly, having done it, we now feel the most complex part was taking the old diesel out and that if you can put together a piece of IKEA furniture you can convert a yacht to electric. We will never look back, nor go back to a diesel.

ePropulsion pod drive 6.0 Evo 1

The 40 year old Bukh engine before removal

Out with the old

Skylark ’s 40-year-old Bukh 10 engine was still going strong, well bedded-in but was getting expensive to run and maintain. And like all diesels it was not exactly environmentally friendly.

Taking it out wasn’t something to be rushed. Getting the spanners into what is inevitably a very restricted space is an art that takes a while to master.

Persuading the embedded bolts and fixings to loosen is not for the faint hearted. However, a little cussing, the odd cut and much WD40 given time to work seemed to do the job.

In a few hours each day over a couple of days we removed the Bukh. The bits we were worried about, the engine mounts and the drive shaft, turned out to be easier than expected.

The numerous hoses and cables felt a bit ‘Forth Road Bridge’ and seemingly endless, although it was a relatively straightforward task. Just painstaking and on occasions painful.

Having taken everything off the engine the next task was to lift it out. At 140kg this was not a light load. We constructed a frame over the boat using scaffold poles, attached a chain hoist and lifted it gently up and out. It was a dream, all went without a hitch.

Once in the air we had the advantage of having the boat on her trailer, so simply rolled the trailer forward and lowered the engine onto a wheeled pallet. Job done.

With the engine out, there was so much space which got even bigger as we took out the exhaust system. This was actually a genuine ‘five minute job’ and revealed a massive space now used for extra stowage.

Then out came the fuel tank and its attendant tubes and more space gained. But most of all was the joy of saying goodbye to smelly diesel.

Next was to fill the redundant holes in the skin of our ship, the water inlet and outlet, the exhaust outlet. That felt good, the fewer holes in the hull the better!

Drilling holes through the bottom of your boat is a daunting prospect

Finally, the ‘Big Clean’! The bilges of any boat are always a bit grimy, but years of oil and muck warranted a really good scrub. Traffic film cleaner worked well as a degreaser, then loads of soap and water – a task made so much easier knowing that it was the last time our lovely hull would be subjected to those yesteryear hydrocarbons. Hurrah!

Finally we had a clean slate and perfect foundations for the new installation.

In with the new

This proved to be so straightforward, despite being a little daunting at first. Just like IKEA kits, with a good read of the instructions and marshalling the right tools we set to with an engineering chum (to bolster our confidence!)

First, we spent a good amount of time planning. Second, we glassed a 50cm x 50cm marine ply pad onto the inside of the hull, as belt and braces to spread the load of the engine fitting. Essential, no. Diligent, yes. We felt it ensures our engine will be safe and securely mounted for the coming decades.

The ePropulsion Pod engine is totally external and is simply secured to the hull with three 10mm bolts. All that’s required is a 66mm hole for the cables to feed through.

Feeding the cabling through the hull from pod to battery

Shaping the mounting plate to the contour of the hull

Testing the pod’s position before securing it

Carefully working out how and where to position the engine took a good amount of time. We cut off the last 15cm of the drive shaft cowling, otherwise our propeller would have been too close to the rudder. The cutting was easy (in retrospect). Shaping the spacer to the shape of the hull so the engine would sit vertically did take time.

In retrospect, a sharper cutting edge, and more confidence, would make it much simpler next time. Engine fitted, next we moved on board to install the controller, the charger, the morse and the control panel, all very straightforward.

Our top tip – place the control panel in an easy to see position with the instrument cluster on the forward cockpit. The data is really useful and benefits from easy viewing while at sea.

Scaffold pole crane and block and tackle were required to lift the new battery aboard

Next came the battery. Our ePropulsion E175 9kWH battery is compact at 52 x 55 x 27cm although quite heavy at 87kg. It fits perfectly on the engine mounts, the load spread by a piece of marine ply, and takes up only half the space of the old engine.

We lifted it on board using the same chain hoist, lowered it gently into the cabin and slid it forward on an old mountain skateboard that I found in the garage. It was so much simpler than we had dared hope.

Finally, connecting it all up was a steady, logical process that needs to be approached methodically, but it’s not difficult. Then, the big switch on. A press of a button and all springs to life.

I still marvel every time I switch it on. Apart from a few lights, there’s little to show or hear! Push the morse forward and silent, powerful thrust results.

Subsequently, we haven’t looked back and will certainly never go back to burning noisy, smelly, dirty, hydrocarbons with all the damage that they do to our fragile environment.

New battery in situ where the Bukh diesel engine used to be

12V leisure system

Prior to conversion Skylark carried two 12V batteries. These worked well for day sailing, charged by the engine when motoring and trickle charge solar when at rest.

However, with an electric engine there is no alternator so power can get a bit short living aboard after a couple of days out, running instruments, charging phones, lighting etc, without a means of recharging power.

A new solution was required and after much experimentation we have gone for two Totalpower 500 12V lithium leisure batteries, one for the instruments and one for the Totalfreeze fridge. This provides so much power and is easily maintained by the Totalsolar 100 solar panel.

The control box and charger in place behind the battery with lots of stowage space still available

Lithium batteries have many advantages. You can use all the capacity, as opposed to around 50% with lead acid and they can run 240V appliances as well as 12V. In-battery data screens provide all information live.

Weighing only a few kg – less than a quarter of the weight of lead acid batteries – they are much easier to use and so much more versatile.

Wind generation

Currently, we carry an experimental 48V wind generator. So far it is proving most successful. It is powerful, quiet, and neatly out of the way.

The great benefit is that on a swinging mooring, or at anchor, it means we rarely need to use 240V. We are continuing our research into which brands to select until we have enough data to make informed decisions.

Skylark on her mooring in Chichester Harbour

Solar generation

We carry two 12V Totalsolar 100W solar panels This means that we charge the fridge battery in parallel with the leisure batteries. We now have much more 12V capacity than we need – and there is now always ice on tap!

Tenders and paddleboards

To complete our eco set-up our tender has an ePropulsion electric outboard recharged by hydrogeneration and solar. We carry a lightweight ThrustMe engine for runs ashore. Even our Sandbanks Style paddleboards have an electric Vaquita motor, enabling us to always get back to the boat against strong winds and tides.

Tender has an electric outboard engine too

Electric sailboat experience

Some people fear running out of power, but it’s not proving an issue for us. Electricity is generated by the engine hydrogeneration system when sailing. Input is around 100W per knot when sailing between 4 and 10 knots, at the cost of 0.7 knots of boat speed. In addition, we have the wind generator and on occasion 240V mains power.

Solar panels charge the 12V system when living aboard. Skylark lives on a swinging mooring and on the odd occasion when we want to charge from the mains, usually before a long passage, Chichester Harbour Master and MDL Marinas supply 240V electricity free of charge to electric boats at four points around the Harbour (an eco practice worth encouraging).

In reality we rarely use more than a small proportion of the engine’s potential. Skylark weighs approximately three tonnes loaded. We normally cruise at about 975W at just under four knots, which gives over nine hours of motoring.

Silent motoring under engine catches others unawares

A full 6kW gives around eight knots for a much shorter time. We lived aboard for three weeks in the summer, charged just three times (as there was very little wind), and never went below 50% on the battery.

Motor sailing back 29 miles from Southampton Town Quay in under 4 knots of wind, with strong tides both with and against us, we used less than half the battery.

Electric sailboat conversion costs

At the time of conversion we’d retired from the commercial world and had been philanthropists for eight years, gifting our time, so cost management was a critical factor. We spent a good deal of time looking at costs, and the conversion has dramatically reduced our running costs. The logic is as follows:

Bukh annual running costs

I’m a reasonably capable with practical maintenance, however the single cylinder Bukh with its quirky oil seals and gaskets, took me days of work, so it was more practical to work with a professional engineer at a cost of around £300pa for parts and labour, fuel was around £100pa, my morse replacement in its last year was £268, and a new 12V engine starter battery at £120 making a total of £788 spent in 2020.

Pod drive awaiting its prop. New skeg just forward protects the drive from grounding

Electric sailboat running costs

The total cost of the engine set up, including engine battery controller etc. was £6,800. The chain hoist cost £35, 66mm drill bit £12, fuel £0 (free electricity supplies in Chichester Harbour) so total installation cost £6,847. This engine should last for decades.

Assuming a conservative write-down over 15 years, this equates to £456pa. Economically, going electric has been a great decision. It costs around half the annual cost of before, and is so much less damaging to the planet.

Electric sailboat liveaboards

Our three weeks away were an absolute joy – silent eco sailing and silent motor-sailing in the many days of calm we experienced this summer. Everyone stops us wanting to know how we do it, as we silently cruise past 38-footers!

Electrical power is generated while sailing

Range anxiety? We are totally over it! We did passages of up to 40 miles in little wind and didn’t use more than 50% of our battery capacity.

We motored from the Solent into Poole Harbour where we spent several days pottering and stand-up paddleboarding, only charging from shore power prior to embarking on our next long passage as due diligence, since the calm weather had limited our wind generation.

We have found that, as with all electric engines, there is a huge amount of torque giving fabulous manoeuvrability and the joy of silent motoring.

At steady speeds she uses very little power, then faster speeds seem to push the effort up on a roughly cube basis. This is great at encouraging us all to be traditional and work with the wind and tides not despite them.

Having an electric engine also totally changes the way one sails, tacking up wind with just 2-300W gives an extra couple of knots and an additional 10° of pointing angle (as the apparent wind shifts), and all this silently. Wow!

Electric sailboat conversion: What we learned

Switching to lithium.

We haven’t found anything to fear and it takes our sailing to the next level. The one thing that took us a while to suss out was how to run our leisure systems as lead acid batteries only last a couple of days with no alternator on hand!

Our learning was to ditch lead acid in favour of lithium, a quarter of the weight and you can use all the battery power, not just 50% of it. We now have so much power that we happily run a TotalCool fridge solar charged.

We will never go back to hydrocarbons. Going electric is such an all-round better experience as well as making a significant difference to the fragile marine environment. Downsides? The only one we’ve found is that folk joke they’re reluctant to race us, as they can’t tell if we’re running the engine!

Looking to switch to an electric outboard engine ? Click here for advice on how to choose the right engine for your type of cruising

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Propulsion Systems for Multihull

Experience the pleasure of extended anchoring or overnighting without running a generator! The large propulsion battery bank (compared to standard house battery banks) enables much longer silent intervals; you can run all creature comforts (air conditioning, heating, refrigerator/freezer etc...) without the need to run a generator all night.

The Oceanvolt platform is designed and installed to become the complete power solution for the entire boat - including the 12V (or 24V) service power system as well as all other appliances/other comfort equipment (110/220V outlets). Range and recharging are achieved either through hydro generation or through a DC generator which can enable constant long-range cruising or bringing batteries up to a full charge in less than 2 hours.

Hydro generation is particularly suitable for catamarans as twin (or quad) motors means double (or quadruple) the energy. Catamarans also cruise more easily at faster speeds which means that regeneration capabilities are significantly higher (hydro generation capability increases significantly at speeds over 6kn).

Oceanvolt also offers repowering solutions for conversion of existing diesel engines – removing the diesel engine, fuel tanks and exhaust system - cleaning up greasy engine compartments and freeing up both weight and space below deck.

All Oceanvolt systems are engineered to operate at 48 volts for passenger safety and ease of repair. Oceanvolt systems are extremely low maintenance and do not require winterization (no annual engine maintenance costs).

Oceanvolt offers Hybrid or Electric systems in partnership with a wide range of multihull designers and boat builders. Multihull configurations are typically either twin systems or, in the case of larger cats, quad systems.

Twin system configuration

Owner testimonials.

Rapido 40 #7 “NullEins”

SQ46 Sailing Catamaran

Leopard 40 “Microactivist”

Everything electric boats and boating

Electric Inboard Boat Motors

Plugboats Guides Motors News Motors For Sale

With information about 150 electric inboard boat motors from 17 manufacturers, welcome to what we believe is the most complete guide to electric inboard motors. It has been assembled to provide a single place where someone interested in electric marine propulsion can find the top line details to compare electric inboard motors made all over the world.

You may also be interested in our other guides »» Guide to Electric Outboards Under 5kW »»  Guide to El ectric Outboards Over 5kW »»  Guide to Electric Saildrives and Pods »» Guide to Electric Trolling Motors »» Guide to Electric Boat Batteries

»» Plugboats also has the world’s largest and most complete Directories of over 600 electric boats, motors, batteries, accessories, solar panels and rental/charter companies

Information on using the Plugboats Electric Inboard Guide

The top of this web page is an Illustrated Guide with photos of the motors and specifications to the right. At the bottom of the page is a Sortable/Searchable Table that lets you compare motors easily. If you are going to be using the table extensively the page is best viewed on a computer rather than smartphone or tablet.

• Illustrated Guide

The motors are organized in alphabetical order by manufacturer, then by model line. For the specifications we have tried to make it a user friendly as possible. If there are 3 models in the line, we will give the specs for each model with a comma in between. If there are many models, we give a range from without lining the specs up with specific models.

• Sortable/Searchable Table

The table can be searched with any keyword – manufacturer, for instance, or can be sorted by any of the columns: Peak kiloWatt power, Continuous kiloWatt power, estimated HP equvalent, Voltage, Dimensions (Length, Width, Height), Weight, RPMs, Type of motor and cooling system (air, liquid, water), and whether it is regenerative – capable of recharging when the boat is under sail propulsion.

All specifications are taken from the manufacturers’ websites or brochures without any independent verification. There is a lot of variety in the way manufacturers detail the attributes of their products, particularly when it comes to ‘Power’. Some use peak power as the measurement, some use continuous power, and there are other variations. Some quote minimum RPMs for their motors, others quote maximum RPMs. There is also no set standard for ‘horsepower equivalent’. We have tried to present the information as close as possible to an ‘apples to apples’ comparison.

The photographs and drawings are from the manufacturers’ websites and are not shown in any consistent scale.

Power Ratings – measured in kiloWatts kW  power rating quoted is taken from the manufacturer website. Some quote only peak power or continuous power, some quote input power and output power. We have indicated what the measurement is, although in the table we have used peak power as equal to input power and continuous as equal to output. power. HP is ‘HorsePower equivalent’ so that you can get an idea of the power of the motor in comparison to a HP rating you might be more familiar with. As noted above, there is a lot of leeway in how this is interpreted. When manufacturers have provided an HP equivalent we have used that.

• IN THE TABLE , when no HP equivalent has been provided, we have used the continuous power and multiplied it by 1.3 to indicate HP equivalent. We have noted it with an asterisk * when we have done this.

Voltage  is most often referred to on the sites as simply ‘Voltage’. Some indicate nominal or peak, we have used nominal and indicated if peak is also referenced.

Current  is noted when the manufacturer supplies the information. It is not included in the table.

Torque is shown in Newton metres, Nm. A Nm is about 3/4 of a foot-pound, or conversely, a foot-pound is about 1 and 1/3 Nm.

Dimensions of the motors and shaft are shown in millimetres – mm. There are about 300 mm in 1 foot, or about 25 mm in 1 inch.

Weight is in kilograms. A kilogram is 2.2 pounds.

Motor Types 
There are advantages and disadvantages to each kind of electric motor. Some manufacturers use abbreviations to describe their motors, others use the full words. We have used whatever the manufacturer prefers, but when abbreviations are used, this is what they mean:

BLDC: BrushLess Direct Current

PMAC: Permanent Magnet Alternating Current

Information on this page updated February 4, 2023

You may also want to check our Directory of Electric Boat Motor manufacturers, dealers and distributors around the world, or the Plugboats Marketplace of electric boat motors for sale.

Manufacturers in this Buying Guide: Bellmarine • Combi • Damoto • Elco • Electric Yacht • Electrine • EP Technologies • ePropulsion • E-TECH • Fischer Panda • GreenStar Marine • Huracan • Krautler • Lynch • Mitek • Molabo • Newport Electric Boats • Oceanvolt • Piktronik • Synapseo • TEMA • Thoosa • Torqeedo • waterworld

Click on the Manufacturer’s name or red cross on right hand side to open and close window with information and links for that company’s electric electric inboards

Click »» here to see Bellmarine motors for sale from vendors in the Plugboats Market

»» Bellmarine website

Bellmarine is a very well established electric boat motor company with a history going back to 1999. They have now been purchased by and are merged with Transfluid, a large scale industrial motor manufacturer. Bellmarine offers a wide range of electric inboard motor configurations, both direct drive shaft and reduction geared. They range from 2 kW to 130kW and come in four model lines: the straight drive Drivemaster, dual motor ModularMaster, geared Thrustmaster and high power Shaftmaster. They are sold as complete systems with optional extras available.

Bellmarine DriveMaster Air Cooled Series 9 Models: DriveMaster 2A, 5A, 7A, 8A, 10A, 15A, 25A, 35A, 50A

• kW : Peak: From 2kW – 50kW | Continuous: From 1.5kW – 40kW • Voltage : 48V – Models 2A, 5A, 7A, 10A | 96V – Models 8A, 15A | 144V – Models 25A, 35A, 50A
• Motor Type : Permanent Magnet AC (PMAC)
• Cooling : Air cooled
• RPM :  1500
• Includes : Motor with mounting brackets and silent blocks • Motor with integrated thrust bearing • Vector control inverter IP65 • NMEA2000 compatible (Apply Transfluid) • Main switch and main fuse • DC-DC converter 12 Vdc • 5m cable for display, lever, key • Quick install / easy connect / plug and play
• Available : Regeneration (with upgrade to battery monitor), Control throttle, display, cooling kit, coupling, shaft with propeller
• Country of Manufacture : Netherlands/Italy
• Price : NA on website

Bellmarine DriveMaster Liquid Cooled Series 9 Models: DriveMaster 3W, 7W, 10W, 15W, 20W, 20W-EVO, 30W, 45W, 55W

• kW : Peak: From 3kW – 55kW | Continuous: From 2.5kW – 45kW • Voltage : 48V – Models 3W, 7W, 10W, 15W, 20W-EVO | 96V – Model 20W | 144V – Models 30W, 45W, 55W
• Cooling : Liquid cooled
• Includes : Motor with mounting brackets and silent blocks • Motor with integrated thrust bearing • Vector control inverter IP65 • NMEA2000 compatible (Apply Transfluid) • Main switch and main fuse • DC-DC converter 12 Vdc 5m cable for display, lever, key • Quick install / easy connect / plug and play • Inlet and outlet liquid connections
• Available : Control throttle, display, cooling kit, coupling, shaft with propeller

Bellmarine ModularMaster Series 3 Models: ModularMaster 40W-EVO, 40W, 60W

• kW : Peak: 40, 40, 60 | Continuous: 30, 30, 50 • Voltage : 48V – 40W-EVO | 96V – 40W | 144V – 60W
• Includes :  True redundancy in case of one motor failure • Aluminum made split power drive • Mounting brackets and silent blocks • Live PTO available • Vector control inverter IP65 • NMEA2000 compatible (Apply Transfluid) • Main switch and main fuse • DC-DC converter 12 Vdc • 5m cable for display, lever, key • Quick install / easy connect / plug and play • Inlet and outlet liquid connections• Closed loop liquid cooling size XL mounted aboard
• Available : control throttle, display, cooling kit, coupling, shaft with propeller
• Country of Manufacture : Netherlands / Italy

Bellmarine TorqueMaster Series 2 Air cooled Models: TorqueMaster 20A, 25A 7 Liquid cooled Models: TorqueMaster 20W-EVO, 25W, 35W, 45W, 65W, 100W, 130W

• kW : Peak: 20 – 130 | Continuous: 15 – 100 • Voltage : 48V – 20W-EVO | 96V – 20A, 25W | 144V – 25A, 35W | 288V – 65W, 100W | 384V – 130W
• Cooling : See above
• RPM :  20W-EVO – 1500, all other Models 3000
• Includes : Motor with mounting brackets and silent blocks • Drop Box with integrated thrust bearing – 225 mm offset • Vector control inverter IP65 • NMEA2000 compatible (Apply Transfluid) • Main switch and main fuse • DC-DC converter 12 Vdc • 5m cable for display, lever, key • Quick install / easy connect / plug and play • Dropbox aluminum made – no cooling needed – low noise and low vibration • Oil temperature sensor • Elastic coupling between motor and Dropbox • DIN120 output (SAE 1410 upon request) – “U” drive possible

Bellmarine ShaftMaster Series 6 Models: ShaftMaster 25W, 35W, 45W, 64W, 100W, 130W

• kW : Peak: 25kW – 130kW | Continuous: 20 – 100 • Voltage : 96V – 25W | 144V – 35W | 288V – 45W, 65W, 100W | 384V – 130W
• Motor Type : Motor Type : Permanent Magnet AC (PMAC)
• RPM :  3000
• Includes : Motor with mounting brackets and silent blocks • Live Pto available • Marine gear with integrated thrust bearing (up to 130 kW) • Oil temperature sensor • Output offset 103 mm • Elastic coupling between motor and transmission • Vector control inverter IP65 • NMEA2000 compatible (Apply Transfluid) • Main switch and main fuse • DC-DC converter 12 Vdc • 5m cable for display, lever, key • Quick install / easy connect / plug and play • Inlet and outlet liquid connections • Throttle lever (TFC) • Self priming pump (mechanical) mounted aboard • Oil-water cooler mounted aboard • Closed loop liquid cooling size XL mounted aboard

»» Combi website

Combi Outboards was founded in 1979 in Giethoorn (‘the Dutch Venice’) to supply rental boats with clean electric power. It is now a leading international supplier of electric propulsion solutions for the maritime market. Combi inboards have all of the operating components in one housing, ready to plug in to batteries, throttle and monitoring systems. Motors are available both AC asynchronous (induction) and BLDC Permanent Magnet. The two larger inboards are dual motor, and can be operated on the Master / Slave principle but can also sail on a single motor. 

Combi Inboard 5 Models: CI-3.5, CI-5, CI-7.5, CI-10, CI-16, CI-20

• kW : From 3.5kW to 20kW • Voltage : 48V • Current : From Nominal –73 / Cruising speed – 50 to Nominal – 417 / Cruising – 240 • HP : From 9HP to 33HP
• Motor Type : Brushless AC asynchronous • OR • Brushless DC Permanent Magnet (PMDC) Cooling : CI-3.5 Air cooled, all others liquid cooled
• RPM :  From 1200 to 1500
• Shaft (cm) : Can be connected to all common propeller shaft sizes
• Includes : Our systems are constructed in such a way that all components are used in a motor housing. You just need to connect only the power cables. The engine foundation is prepared so that it is easy to install.
• Country of Manufacture : Netherlands

»» Damoto website

Damoto is a Dutch developer, manufacturer and distributor of an extensive range of premium electric inboard motors from 2kW to 40kW nominal. The first model dates from 2005 with more than 3000 boats equipped with it, including recreational sloops, charter and rental boats. The motors are now released under the name Damoto eFLOW but have been well known in the international maritime industry for many years.

Damoto eFLOW Original Series 5 models: eFLOW 2.0 Air, eFLOW 2.5 Air, eFLOW 3.0 Air, eFLOW 6.0 Air, eFLOW 11.0 Air

• kW : Nominal: 2kW to 11kW | Peak: 3kW to 15kW max
• Motor Type: Brushless 3 Phase Asynchronous • Cooling: Air cooled
• IP : IP66
• Includes : stainless steel motor frame with silent blocks, motor, thrust bearing, controller in stainless steel casing incl. marine software & PC/handheld connector for motor tuning, main power contactor & fuse, controller cable with connectors (Plug-n-Play)
• Available : Displays, throttle levers, shaft couplings
• Country of Manufacture : Netherlands / Europe
• Price : Not available on website

Damoto eFLOW Liquid Original Series 8 models: eFLOW 3.0 Liquid, eFLOW 5.0 Liquid, eFLOW 10.0 Liquid, eFLOW 15.0 Liquid, eFLOW 20.0 Liquid, eFLOW 30.0 Liquid, eFLOW 40.0 Liquid Dual Motor, eFLOW 14.0 Liquid 4Hybrid Dual Shaft

• kW : Nominal 3kW to 40kW | Peak: 6kW to 80kW
• Motor Type: Brushless 3 Phase Asynchronous • Cooling: Liquid cooled
• Includes : stainless steel motor frame with silent blocks, motor with liquid inlet & outlet, thrust bearing, controller in stainless steel casing incl. marine software & PC/handheld connector for motor tuning, on-board power converter (12V) integrated in controller casing, main power contactor & fuse, controller cable with connectors (Plug-n-Play)
• Available : Displays, throttle levers, cooling kits, shaft couplings

Damoto eFLOW Air All-in-One Series 3 models: eFLOW 2.0 Air AiO, eFLOW 3.0 Air AiO, eFLOW 6.0 Air AiO

• kW : Nominal 2kW to 6kW | Peak: 6kW to 80kW
• Includes : stainless steel housing, motor with silent suspension, thrust bearing, controller module incl. marine software & PC/handheld connector for motor tuning, main power contactor & fuse, connectors on box front (Plug-n-Play), wired & tested
• Available : throttle levers, shaft couplings

»» Elco website

Elco (Elco Motor Yachts) is the oldest electric boat motor company in the world, having been started in 1893 as the the Electric Launch Company to supply electric boats for the Chicago World’s Fair. It offers a full range of outboards, inboards and hybrids. Their Plug n Play system has all wiring and active power components in a marine grade aluminum casting rated IP-65. Can be purchased from the Elco website along with batteries, options and accessories, leading to a one-price checkout. They also have a ‘ Find My Motor ‘ calculator on the site.

Elco Inboards 6 Models: EP-6, EP-12, EP-20, EP-40, EP-70, EP-100

• kW : Peak: From 4.4kW – 73.5kW | Continuous: From 2.5kW – 42.5k • Voltage : From 36Vdc to 144 Vdc • Amps : 70A – 295A • HP : 6HP – 100 HP
• Dimension s: From L: 17” / W: 16.22” / H: 15.8” to L: 35”  /  W: 18.82”  /  H: 19.25” 
• Includes : Motor and controller.
• Available : Motor mounts, shaft couplers, batteries, battery monitor, chargers, cables, and other accessories
• Country of Manufacture : USA
• Price (does not include options) : $US 7,000 – 21,000

Electric Yacht

Electric Yacht is one of the premier US suppliers of electric motors for sailboats with a  Plug-n-Play system designed for DIY installation by “ a competent boat owner using simple tools and the easy to mount Electric Yacht system “. Their systems offer regenerative power while under the sail. 10 years of proven production with over 450 installs. 3 Year Warranty.

Electric Yacht QuietTorque single motor inboards 3 Models: QT5, QT10, QT10 Sport

• kW : Input – 2.5kW – 30kW, Continuous 2kW – 8kW • Voltage : 24, 36 or 48V for Quiet Torque 5.0, all others 48V • Current : 100A – 200A • HP : 10-25
• Motor Type : PMAC (Permanent Magnet Brushless AC) • Cooling : Air cooled • IP :
• RPM : 
• Dimensions : L: 432mm, W: 245mm, H (with mountings): 342mm Adjustable mountings • Weight : 40 lbs, 70 lbs
• Includes : The motors are sold as systems with everything included except the battery, which can also be purchased from the company. The systems can be purchased directly from the website.
• Price : $US 5,000 – 9,000

Electric Yacht QuietTorque dual motor inboards 6 Models: QT20, QT30-Air-Cooled, QT30-Liquid-Cooled, QT40, QT45, QT60.0

• kW : Input – From 20kW – 60kW Continuous – From 16kW – 52kW • Voltage : 48V – QT20, QT30-Liquid-Cooled 72V – QT30-Air-Cooled, QT40 96V – QT45, QT60 • Current : NA • HP : From 25 – 80
• Motor Type : PMAC (Permanent Magnet Brushless AC) • Cooling : Air cooled – QT20, QT30-Air-Cooled, Liquid cooled – QT30-Liquid-Cooled, QT40, QT45, QT60 • IP : NA
• RPM : NA
• Torque : NA
• Dimensions : L: 673mm, W: 534mm, H (with mountings): 534mm Adjustable mountings • Weight : From 135 lbs to 200 lbs
• Price : $US 14,500 – 18,000

»» ELECTRINE website

ELECTRINE is a Korean manufacturer which has focused on maritime electrification since 2010, when the idea of electric mobility was still relatively uncommon. The company was known as LGM until 2020 and has had a consistent R&D effort for many years. They manufacture electric outboards, inboards and saildrives as well as accessories and Lithium-ion batteries using a Carbon Nano Tube heat exchanger technology. There are 7 models in the eINBOARD Line, the ZI40, ZI60, ZI90, ZI115, ZI180, ZI270 and ZI350

E-ELECTRINE e-INBOARD line 7 Models: ZI40 (shown), ZI60, ZI90, ZI115, ZI180, ZI270, ZI350

• kW : (Max): 43, 60, 110, 150, 173, 200, 250 • Operating Voltage (Vdc): 72~96, 288~384, 288~384, 288~384, 288~384, 500~738, 500~738, 500~738
• Motor Type : N/A
• RPM (Max):  8006, 7160, 10,250, 8000, 6204, 3500, 3375
• Torqu e (Max) Nm: 72, 167, 255, 251, 555, 2100, 2700
• Weight | Dimensions (kg | mm) N/A | 390 x 360 x 323, N/A | 390 x 360 x 323, 93.5 | 665 x 468 x 476, 93.5 | 665 x 468 x 475, N/A | N/A, 500 | 902 x 1200 x 733, 500 | 902 x 1200 x 733
• Country of Manufacture : Korea

EP Technologies

»» EP Technologies website

EPTechnologies is a complete marine propulsion provider for electric and hybrid vessels. The company specializes in custom electric and hybrid systems, but also has ‘off the shelf’ motors, including the drop-in Stern Drive unit below. The company delivers complete systems including batteries designed and built by EP Technologies.

EP Technologies Drop In Unit

• Voltage: 400
• Other: This motor system has been designed by EP Technologies as a complete drop-in unit for a Mercury Sterndrive. Includes all batteries, controllers and accessories
• Country of Manufacture : Denmark
• Price : Contact EP Technologies

EP Technologies Electric Motor

• For boat sizes 60′-250′
• kW (Continuous) : 400 (Peak) : 700
• Torqu e (Max) Nm: 7800
• Other : Can be stacked together for 800kW or 1400kW peak

ePropulsion

Click here to view motors from ePropulsion dealers in the Plugboats Marketplace

»» ePropulsion website

ePropulsion was established in 2012 and is led by a team of technology entrepreneurs that are focused on developing uncompromising, superior products. It was the first company to launch a brushless, direct-drive electric outboard motor in the market. ePropulsion offers a portfolio of electric outboard motors – some of which offer hydrogeneration – pod drives, and inboard motors. The company is focused on products and services for all kinds of electric boats from dinghies and fishing boat to sailing boats to commercial and leisure motor vessels up to 100-feet and displacement of 200 tons.

ePropulsion I-Series T hree (3) models: I-10, I-20, I-40

• kW : 60kW to 140kW • Voltage : H-100: 540 VDC
• Motor Type : permanent magnet motor technology • Cooling : I-10 Air cooled | I-20 & I-40 Water cooled (air cooling optional) • IP : IP67
• RPM :  1500 all models
• Torque : 56 Nm | 111 Nm | 222 Nm
• Dimensions : I-10: 565 x 295 x 380 mm | I-20: 580 x 330 x 380mm | I-40 860 x 485 x 420mm • Weight : 43kg | 45kg | 75kg
• Includes : Weather & impact resistant metal housing contains integrated motor, gearbox, electronic control system, ECU, thermal management system and suspension, Smart 5” Display, ePropulsion Smart System Architecture (eSSA), Advanced driver assistance system (ADAS), Wired & tested, plug & play installation to new boat or retro-fit to existing shaft, NMEA 2000 compatible, CAN Bus communication, Fault diagnosis system & full redundancy design
• Available : Smart throttle, G102-100 battery, propeller, air-cooling, HVAC System, shaft and coupling, charger, remote data access & fleet management with IoT connectivity service
• Country of Manufacture : China
• Price : On application

ePropulsion H-Series Four (4) models available: H-60, H-85, H-100, H-140

• kW : 10kW | 20kW | 40kw • Voltage : 86~115 VDC all models
• Motor Type : permanent magnet motor technology • Cooling : Water cooled • IP : IP67 
• RPM :  H-100: 1150
• Torque : 797 Nm
• Dimensions : H-100: H 433mm  x W 433mm x D 315mm • Weight : H-100: 190kg
• Includes : Weather & anti-corrosion metal housing contains integrated motor and  gearbox, high torque density (max 2000Nm), modular design to extend range and power with extra motors, batteries and controllers, high accuracy position feedback, Boating IoT system enables remote monitoring and integrated management, Customised data for speed, power, track, mileage, safety alarm etc., NMEA 2000 compatible
• Available : Controller, remote control and display – single & dual controls, custom batteries 

»»  E-TECH website

E-TECH is a subsidiary of boatbuilder Starboats that was started in 2008 because they were dissatisfied with other electric motor offerings in the market at the time. The company has developed fixed pods, steerable pods and outboard motors that all utilize an in-water BLDC (BrushLess DC permanent magnet) pod motor in a watertight aluminum casing. The inboard motors are designed to fit any engine bed and any propeller shaft. For in-line hybrid applications, there are shaft endings on both ends of the engine to make an easy and quick in-line installation.

Click here to view motors from E-TECH dealers in the Plugboats Marketplace

E-Tech Standard Inboards 6 Models: 4WG, 7WG, 13WG, 18WG, 23WG, 35WG

• kW : From 4.3kW, 7.1, 11.9, 16.7, 21.5, 33.7 (power measured on the shaft) • Voltage : 48V, 48V, 48V (4WG, 7WG, 13WG) | 72V – 18WG | 96V – 23 WG, 144V – 35WG • HP : 6, 9.5, 16, 23, 30, 45
• Motor Type : Brushless permanent magnet BLDC • Cooling : Water cooled •  IP : 67
• RPM :  (min) From 1100, 1200, 760, 1140, 1520, 2500
• Shaft : 25mm (4WG, 7WG) or f 30mm (10WG, 15WG, 20WG), 8mm spline
• Includes : Controller, battery monitor / display, cabling, joystick (side or top mounting), integrated cooling circuit for controller with Quick-Click connections, main switch, main fuse.
• Country of Manufacture : Poland

E-Tech High Torque Inboards 4 Models: 13 Pod, 18 Pod, 23 Pod, 35 Pod

• kW : From 11.9 kW, 16.7 kW, 21.5 kW, 33.7 kW (power measured on the shaft) • Voltage : 48V, 72V, 96V, 144V • HP : ≈ 16, 23, 30, 45
• RPM :  (min) From 760, 1140, 1520, 2500
• Shaft : f 30mm, 1:10 conic

Fischer-Panda

»» Fischer-Panda website

Fischer Panda is one of the world’s best known manufacturers of marine generators but are also manufacturers of high quality electric boat motors, sometimes marketed under the ‘Whisperprop’ name. They have an “EasyBox” system that is intended to take the guesswork and complication out of purchasing electric boat motors. There are various sample configurations on their website displaying how the EasyBox system is laid out in different boats.

Fischer Panda Easybox DE-Shaft systems 5 Motors: A06-140-6-SH, A50-160-6-SH, B00-150-8-SH 10 kW, B00-150-8-SH 20 kW, B00-300-8-SH 20 kW

• kW : (continuous) 3.5kW – 20kW • Voltage : 48V • Current : • HP :
• Motor Type : PMAC • Cooling : Water
• RPM : 600 – 2500
• Torque : 28Nm – 320Nm
• Dimensions : L: 400mm – 560mm W: 270mm H: 270mm • Weight : 15kg – 96kg
• Includes : EasyBox control, GD2 control panel, throttle
• Available : Battery bank, charger, shore power connection, 230V adaptor
• Country of Manufacture : Germany

GSM Electric (formerly Greenstar Marine)

»» GSM Electric website

GreenStar Marine was founded by a group of Swedish engineers in the 1990s to develop a series of electric propulsion systems, including a patented regenerative technology. All of the company’s systems are direct drive one-gear and complete except for batteries. The website has an interactive tool that shows approximate run times for different sized boats and battery/motor configurations.

GreenStar E-Line 2 Models: E-10, E-20

• kW : Peak – 3.5kW, 5.5kW | Nominal – 2.1kW, 4.2kW • Voltage : 24V, 24V • HP : 10, 20
• Motor Type : Brushed DC • Cooling : Air cooled
• RPM :  1000, 1000
• Torque : Nominal: 20 Nm, 40Nm | Peak: 40Nm, 50Nm
• Includes : Motor mountings, control system, basic system monitor, battery charger, monitoring, speed control, shore power system, cables, propeller shaft with low friction bearings, fixed propeller
• Available : Hydrogeneration, folding propeller, extra DC/DC
• Country of Manufacture : Sweden

GreenStar P-Line 3 Models: P-10, P-20, P-35

• kW : Peak – 10kW, 10kW, 30kW | Nominal – 2.5kW, 5.5kW, 11kW • Voltage : 48V, 48V, 48V • HP : 10HP, 20HP, 35HP
• Motor Type : Brushless AC • Cooling : P-10 – Air cooled | P-20, P-35 – Water cooled • IP : 65 or higher classed components
• RPM :  1250, 1250, 1250 •
• Torque : Nominal: 20 Nm, 45Nm, 85Nm | Peak: 75Nm, 85Nm, 130 Nm
• Includes : Hydrogeneration, motor mountings, advanced control system, system monitor, battery charger, monitoring, speed control, shore power system, cables, propeller shaft with low friction bearings, fixed propeller
• Available : Folding propeller, extra DC/DC

»» Huracan website

Huracan was founded at the beginning of 2012 in Venice with the goal of building entirely electric marine motors with the highest reliability of any on the market. The Thor motor is sold in a housing that includes the controller, with throttle, displays, monitors and other accessories sold separately.

Huracan Thor NOTE : The information for Huracan is presented in a different format from other manufacturers because the Thor is the only model, which provides different power ratings at different motor speeds.

• kW : 10kW at 3000 rpm | 20kW at 4000 rpm  | 30kW at 5000 rpm | 40kW at 5500 rpm • Voltage : 220V • Current : NA • HP : NA
• Motor Type : NA • Cooling : Water cooled • IP : 69
• RPM :  3000 – 5500
• Torque : (at axles): 30Nm at 3000 rpm | 49Nm at 4000 rpm  | 56Nm at 5000 rpm | 70Nm at 5500
• Dimensions : L: 543 mm  H: 300mm W: 191mm • Weight : 40 kg
• Available :
• Country of Manufacture : Italy

»» Kräutler website

Kräutler is a long-established Austrian manufacturer of industrial electric motors. They began construction of electric boat motors in the 80’s mainly because they could not find a product that would live up to the standards of founder Oswald Kräutler. They make motors for industrial and ship use as well as recreational boats and offer a wide range of inboards for any size boat or usage. Krautler has 3 lines of electric inboard motors. The WAd and WAz lines are direct drive and run from powers of 2.0kW to 25kW (WAd) and 6kW to 37kW (WAz). The WA line is made up of motors from 30kW to 100kW, for high speed / planing boats.

Krautler WAd and WAz line WAd – 11 Models WAd 2.0AC, WAd 3.0AC, WAd 4.3AC, WAd 5.0AC, WAd 6.0AC, WAd 8AC, WAd 11.0AC, WAd 15.0AC (48V, Air), WAd 15.0AC (96V, Water), WAd 18.5AC, WAd 20.0AC WAz – 10 models WAz 6,0AC, WAz 8,0AC, WAz 11,0AC, WAz 15,0AC (Air), WAz 15,0AC (Water), Waz 18,5AC, WAz 20,0AC, WAz 25,0AC, WAz 30,0AC, WAz 37,0AC

• kW : (Output) From 2.5kW – 37kW • Voltage : 24V – 144V • Current : 104A – 292A • HP : 3.5 – 50 HP
• Motor Type : • Cooling : Air – 6,0 models to 15,0 models (WAd and Waz), Water for 18,5 models to 37,0 WAz model
• RPM :  NA
• Dimensions : • Weight :
• Includes : Controller, throttle, monitor, display, cables
• Country of Manufacture : Austria

Krautler WA High Speed line 6 Models: WA 100/30, WA 150/40, WA 350/50, WA 350/60, WA 500/80, WA 500/100

• kW : (Output) From 30kW – 100kW • Voltage : 100V – 500V • Current : NA • HP : 45 – 130 HP
• Motor Type : • Cooling : Water
• Includes : Battery, controller, throttle, monitor, display, cables

»» Lynch website

The Lynch motor was invented by Cedric Lynch in 1979 – a unique axial gap permanent magnet brushed DC motor with high efficiency. The company offers three lines – the direct drive Yellowtail, geared drive Marlin and dual motor Swordfish. Motor systems include motor in mounting frame, controller, electronics, throttle and basic battery monitor and control cables. (options available on throttles and monitors) Lynch has 3 lines of electric inboard motors: the Yellowtail, Marlin and Swordfish, although the Yellowtail ‘line’ is only one motor.

Lynch Yellowtail

• kW : Peak – 6.0kW, Continuous – 2.5kW • Voltage : 24 • Current : 120/Peak 250A • HP : 5 – 10
• Motor Type : • Axial Flux ‘Pancake’ Permanent Magnet DC • Cooling : NA • IP : NA
• RPM : 1080 • Efficiency : 88%
• Torque : 16/Peak 35Nm
• Dimensions : NA • Weight : Motor: 14 kg Control  box: 12 kg
• Includes : motor in mounting frame, controller, electronics, throttle and basic battery monitor and control cables.
• Available : options on throttles and monitors
• Country of Manufacture : UK

Lynch Marlin : Marlin 5 Single, Marlin 8 Single, Marlin 13 Single

• kW : Peak – 14kW, 14kW, 26kW • Voltage : 48V, 48V, 72VDC • Current : 140/Peak 350A, 180/Peak 350A, 200/Peak 400A • HP : 10-20, 17-25, 35-50
• RPM : 2160, 2160, 3240 • Efficiency : 90%
• Torque : 18/Peak 38Nm , 36/Peak 44Nm, 36/Peak 72/Nm
• Dimensions : NA • Weight : Motor: 21 kg • Controller: 12 kg (14kg on model 13 Single)

Lynch Swordfish : Swordfish 16V Twin, Swordfish 26V Twin

• kW : 16kW/Peak 30, 26kW/Peak 53 • Voltage : 48VDC, 72 VDC• Current : 180A/350 Peak, 200A/400 Peak • HP : 48-60, 60-75
• RPM : 2160, 3240 • Efficiency : 90%
• Torque : 72Nm/144 Peak,
• Dimensions : NA • Weight : Motor: 27 kg Controllers: 14.5 kg X 2 (29kg)
• Includes : motors in mounting frame, controller, electronics, throttle and basic battery monitor and control cables.

»» Mitek website

Mitek is an Italian company with more than 10 years of experience in electric motors. It first came to the attention of the electric boat world when it exhibited its outboards at the Venice Boat Show in June. The Mitek inboards are not sold as systems but as standalone motors to boat manufacturers or boat owners who are keen on DIY.

Mitek Inboards : 4 Models: 260038, 260054, 260061, 26115

• kW : From 17kW/Peak 29 to 85kW/Peak 115 • Voltage : 48V, 96V, 192V, 384V• Current : From 260A/650max to 200A/300max • HP : From 23-39 to 114-154
• Motor Type : NA
• RPM : From 1700 to 2200
• Torque : From 88Nm/Peak 205 to 380Nm/Peak 540
• Dimensions : L: 388mm – 588mm W: 370mm H: 370mm • Weight : 32 – 69 kg
• Includes : Standalone

Click »» here to see Molabo motors for sale in the Plugboats Market

»» Molabo website

Molabo was founded in 2016 with the goal of providing safe-to-touch low-voltage e-solutions to enable sustainable mobility worldwide. To achieve this they developed the ISCAD (Intelligent Stator Cage Drive) motor technology and have been granted 10 patents worldwide with automotive and marine OEM (Original Equipment Manufacturer) partners in Europe and China.

Molabo ISCAD V50

• kW : Peak: 80 | Continuous: 50 •  Voltage : 48V
• Motor Type : PM-SynRM (Permanent Magnet Synchronous Reluctance Motor) ISCAD (Intelligent Stator Cage Drive)
• Cooling : Water: 7 l/min, max. 45°C (dual circuit cooling possible)  •  IP67
• RPM : 4350 • Efficiency : 95.6 % (Motor: 97 %, Controller: 98 %)
• Dimensions : L: 265mm, Diameter: 254mm • Weight : NA
• Includes : Available as components or compete set-up including motor, reduction gear, rubber mounts & brackets, 5″ touch display, throttle top or side mount, molaCONNECT & molaLINK (IOT), communication cable set
• Available : Battery and charger packages: LFP 36kWh, 48kWh and 12kWh additions
• Price : Motor: €19,990 ($US 21,000)  •  With all components package (excluding battery): €28,400 ($US 29,900)

»» Oceanvolt website

Click »» here to Oceanvolt motors for sale in the Plugboats Market

Oceanvolt is one of the best known names in electric boat motors, especially for sailboats, and is a leader in regenerative / hydrogenerative props systems. There are standard systems available, the motors can be purchased separately, and the company can also do custom installations. Oceanvolt has both all-electric and hybrid systems, we have only included the all-electric systems here, and only the standard preconfigured systems.

Oceanvolt Inboard Systems with AX motors: 3 Models: Shaftdrive 3, Shaftdrive 5, Shaftdrive 8

• kW : (continuous) – 3.7kW, 5.3kW, 8.7kW • Voltage : 48 • Current : • HP :
• Motor Type : Synchronous permanent magnet electric • Cooling : Air
• RPM : 2400
• Dimensions : NA • Weight : 22kg, 28kg, 28kg
• Includes : Controller/battery communication kit, Hydrogeneration feature
• Available : Batteries, charger, propeller
• Country of Manufacture : Finland
• Price : $US 6,500 – 8,000

Oceanvolt Inboard Systems with AX3 motors: 2 Standard Systems: Shaftdrive 10, Shaftrdive 20 NOTE: The AX3 motors are 10kW motors that can be ‘stacked’ to create higher powered system, up to 40kW. i.e. the illustration below shows 1 X 10kW AX3 in the diagram but 2 X 10kW AX3s coupled to form a 20kW motor in the photograph .

• kW : 10kw, 20kW • Voltage : NA • Current : • HP : 20 – 60
• Motor Type : PMAC • Cooling : Liquid
• Includes : Battery, controller/battery communication kit, Hydrogeneration feature
• Price : $US 36,000 – 59,000 (includes Lithium battery pack – 13.3kWh/26.6kWh)

»» Piktronic website

Piktronik is an Austrian-Slovenian company working on the research, development and production of components for electrical vehicles (EV) and boats. Their inboards are available as standalones and also as complete systems.

Piktronik Motors : 7 Models: PMSM10, PMSM40 PMSM50 PMSM60 PMSM100 PMSM110 PMSM180

• kW : (continuous) From 10 to 180 • Voltage : From 30V to 307V • Current : From 205A to 370A • HP : From 13.6 to 245
• Motor Type : 3 – Phase  Permanent Magnet Synchronous ( PMSM ) • Cooling : Water cooled • IP :
• RPM : From 1200 to 3600
• Torque : From 80Nm – 555Nm
• Dimensions : From L: 431mm W: 220mm H: 220mm to L: 565mm W: 396 H: 396mm • Weight : From 45kg to 171kg
• Includes : See Piktronik systems below
• Country of Manufacture : Austria/Slovenia

Piktronik Systems : All of the motor power sizes above are available as complete systems. System includes:

• Display, control and battery monitoring unit 
• DC-DC converter
• Battery chargers
• Wire harness, Distribution box, battery fuses and contactors, FI-Box, Ignition switch, User guide

»» Synapseo website

Synapseo was founded by a group of passionate sailors who have a common interest in making our oceans, seas and rivers great again. They have developed the KYWAT, an adaptive in-board solution to easily replace old diesel or gasoline engines. It is available in five models with power outputs from 4kW to 20 kW. The have output shaft diameter of 25mm to 30mm and mounting brackets hat adapt to all standard engine cradles. All motors have hydrogeneration / regeneration.

Synapseo Motors : 5 Models: AE-10, AE16, AE24, AE36, AE60

• kW : 4kw, 6kW, 10kW, 16kW, 20kW • Voltage : AE-10 – AE36: 48V, AR60: 72C • HP : 10, 16, 24, 26, 60
• Dimensions (mm): • AE-10 – AE24: W: 400 L:630 H: 440, AE 36 and AE60: W: 448 L:742 H: 512
• Includes : Control panel, digital throttle, power cables, coupling, four silencing blocks.
• Country of Manufacture : France

»» TEMA website

TEMA was founded in 1989 by Branimir Ruzojcic, Dr.Sc, who is still GM of the company. Its goal was to merge academic and scientific researches and engineering practical resources for offering sophisticated industrial automation products to the market. Today TEMA offers advanced motors/generators using Permanent Magnet technology ranging from 10KW to 1500KW and offers complete electric propulsion systems for all-electric, serial hybrids and parallel hybrid boats, from small leisure yachts to large commercial boats.

TEMA Motors : 5 Models: SPM132-1, SPM132-12, SPM132-2, SPM132-22, SPM132-3

• kW : 10kW – 60kW • Voltage : 48 – 450Vdc • Current : • HP :
• Motor Type : PMAC • Cooling : Air – either natural or forced air/fan
• RPM : Nominal – 3600
• Torque : (Nominal): 70 – 205Nm
• Dimensions : • From L:275mm, H: 260mm, W: 260mm to L: 552mm, H: 260mm, W: 260mm Weight : 70 – 148kg
• Includes : motor controller, marine throttle, information display, Plug and Play easy wiring
• Country of Manufacture : Croatia

»» Thoosa USA website

The Thoosa design has been in production in Denmark since 1998, originally by ASMO Marine, which became Clean eMarine in 2012. They manufacture the AC Triton motor and the DC Thoosa line, which includes four models with power ratings from 5kW to 12kW. All are geared motors. Motor and controller are sold together, with mounting brackets. Throttles and monitors are also available from the company.

Thoosa DC Motors : 4 Models: Thoosa 5000, Thoosa 7000HT, Thoosa 9000, Thoosa 12000

• kW : (continuous) – 5kW, 7kW, 9kW, 12kW •  Voltage : Thoosa 12000 is 72V, others are 48V •  Current : (Peak) 300A – 400A •  HP : 10 – 50
• Motor Type : Axial Flux ‘Pancake’ Permanent Magnet DC •  Cooling : Air cooled
• RPM : 1080 – 1270
• Torque : (Peak) 59.5Nm – 73.3Nm
• Dimensions : NA •  Weight : (System) 37kg – 47.5kg
• Includes : Motor, controller
• Available : Throttle, battery monitor
• Country of Manufacture : Denmark / US Assembly for US models

»» Torqeedo website

Torqeedo is the world’s leading manufacturer of electric outboards. The company was founded in 2004 by Dr Christoph Ballin and Dr Friedrich Böbel when they decided they could build a better electric motor than the one on the boat Dr. Ballin had just purchased. The inboards are sold as a complete system, including batteries, and each is designed for different usage: the 1400 (RPM) models for displacement sailing with heavy boats, the 1800 (RPM) models for for planing with fast boats and the 100kW 900 for large sailing yachts and heavy displacement vessels.

Torqeedo Deep Blue Inboard Line – 25i and 50i models 4 Models: Deep Blue DB25i 1400, Deep Blue DB50i 1400, Deep Blue DB25i 1800 , Deep Blue DB50i 1800

• kW : 25i models – 27.6kW/33 Peak, 50i models – 55kW66 Peak • Voltage : 360V • Current : • HP : 25i models = 40HP, 50i models = 80 HP
• Motor Type : Permanent Magnet Synchronous (PMSM) • Cooling : Water cooled • IP :
• RPM : Model number1400 and 1800 refer to RPMs
• Torque : <280Nm – 343Nm
• Dimensions : L: 680mm W: 512mm H: 376mm • Shaft sizes : 30, 35, 40mm | 11/8,11/4” • Weight : 80kg
• Includes : Complete integrated system, including on-board touchscreen computer, batteries, shafts and propeller.

Torqeedo Deep 100kW 900

• kW : 100kW continuous • Voltage : 360V • Current : • HP : 135
• Motor Type : Permanent Magnet Synchronous (PMSM) • Cooling : Water cooled
• RPM : 900 (max)
• Torque : 1060Nm
• Dimensions : NA • Shaft sizes : 30, 35, 40mm | 11/8,11/4” • Weight : 450kg (w/o battery, including electronics)

»» WaterWorld website

WaterWorld is a joint venture undertaken by two companies, De Stille Boot, a distributor specializing in electric boating and Water World Electronics, a Dutch specialist in low voltage electronics. WWE develops and produces its own printed circuit boards and complete controllers for various markets such as the building and car industry. They have joined together to “offer boat owners and -users the ultimate joy of a quiet, calm and carefree boat ride.” The company offers four direct drive electric inboard systems, with the motor and controller in one housing with adjustable engine supports as well as monitors and other accessories.

WaterWorld Inboards : 3 Models: 4.0 i , 7.5 i , 10.0 i , 15.0 i

• kW : (continuous) – 4kW, 7.5kW, 10kW, 15kW • Voltage : 48V • Current : 92V (max), 172A, 230A • HP :
• Motor Type : Asynchronous • Cooling : Air cooled • IP :
• RPM : 1450 (max), 1350, 1450
• Torque : 27Nm, 53Nm, 66Nm
• Dimensions : (Motor and controller in frame) 4.0i: L- 558mm x W-225mm x H-221mm | 7.5i and 10.0i – L-681mm x W-290mm x H-271mm • Weight : (Motor and controller in frame) 4.0i: 39kg, 7.5i and 10.0i: 76kg
• Includes : Motor, controller, thrust bearing, relay, digital colour touch screen display, throttle
• Price : $US 3,675 – 5,500 (15.0 i tba)

Table – Searchable and Sortable

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Converting from diesel engine to electric motor

• Thread starter jr22553
• Start date Mar 4, 2021
• Hunter Owner Forums
• Ask A Hunter Owner

Has anyone converted from diesel engine to an electric motor? If so, what are your thoughts on the conversion?  

Doing a Conversion from Diesel to Electric

To do it right will take many many and lots of boat bucks. Unless your thing of using a small outboard motor like Torqeedo 20 hp.  

Check out Sailing Uma on utube. They converted to all electric. Tim  

Tim22 said: Check out Sailing Uma on utube. They converted to all electric. Tim Click to expand

Perhaps in a lake to use to get in and out of the dock. Would not think about in the Potomac River or out in the Chesapeake Bay. You need and sustainable power source to fight the currents and foul weather that may develop. At this time a Diesel Auxiliary is still the best option in performance and cost by far.  

Crazy Dave Condon

Which boat mfg &model? Smith mountain Lake or VA coastal area?  

take a look at this (270) Diesel to Electric Sailboat Re-Power, Part One: Installation - YouTube  

Electric Yacht sells electric engines for $5k, equivalent to 25 hp diesel engine for up to 34’ sailboats. Has anyone experienced this engine, and thoughts please? Thanks.  

Bash said: Electric Yacht sells electric engines for $5k, equivalent to 25 hp diesel engine for up to 34’ sailboats. Has anyone experienced this engine, and thoughts please? Thanks. Click to expand

Batteries and installation are extra. But I suspect the entire package is still more economical than a new Diesel engine, and better for the environment.  

jr22553 said: Has anyone converted from diesel engine to an electric motor? If so, what are your thoughts on the conversion? Click to expand

Bash said: ... and better for the environment. Click to expand

And without the diesel smell.  

Bash said: And without the diesel smell. Click to expand

rgranger said: And silent Click to expand

So is the world ready to have a conversation about population control? I’m not sure we are there yet????  

rgranger said: population control? Click to expand

I did see an interesting new application of an older technology being applied to electric motored sailboats that essentially uses the rotating prop shaft under sail to generate electricity and recharge the batteries. Prop shaft generators have been around a long time, but this promises increased efficiency and essentially allows a way for wind to generate power via the sails (the other being a wind generator on the boat). Add solar to that in favorable climes and you have three sources of power that don't burn carbon-based fuel. The boat had do be moving at something like 4 kts for the generation to take place, but for long voyages that could be a significant source of power. Of course, that's at the expense of speed that you might gain with a folding or feathering prop.  

Yes, that concept or "Regeneration" is one of the driving forces used by the French group associated with he Elcano Challenge. In theory and in calm water testing, by Oceanvolt, the marketing numbers appeared successful. Sail a boat at 5.5 knots generate the power and charge the battery. Just like the Wright Brothers with their magic flying machine. The real world cruising attempt Our 1000-mile maiden voyage from La Grande Motte to Seville showed up some of the weaknesses of the regeneration system when it failed to keep up with the overall consumption on a proper voyage, ​ identified the differences between marketing and performance. In summary the following was reported: "the barriers to getting a lot more out of regeneration are formidable since, as Jimmy found out, they are running into basic physics here: drag balanced against regeneration and the need to sail efficiently."​ Granted that science and engineering merge as start someplace. I understand that the " The Elcano Challenge " started by Jimmy Cornell (an experienced world class sailor) was fired to abandon his project of sailing around the world on an all electric catamaran. What was clarified by his ambitious attempt are the engineering barriers of balancing the drag on a boat, the energy costs of regeneration, and the electrical demands involved living on a boat in the ocean. What is the phrase? An intriguing idea - not ready for prime time! But it may be just a brilliant idea away from possibility. Such creativity has given us all sorts of new concepts. From the Wright Brothers at Kitty Hawk we now fly in Space.  

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Home » Blog » Gear » Buyers guide to electric boat motors (2023)

Buyers guide to electric boat motors (2023)

By Author Fiona McGlynn

Posted on Last updated: August 3, 2023

Considering making the switch to an electric boat motor? With electric vehicles now commonplace on the roads, it’s no wonder so many boaters are curious about electric boats.

While electric boat motors have been around for a while, in the last several years the technology has taken huge leaps, resulting in more powerful motors, longer-lasting batteries, and ultimately more options for recreational boat owners.

Today, many types of boats can be outfitted with an electric propulsion system including pontoon boats, sailboats, jon boats, powerboats, fishing boats, yachts, and trawlers . If your boat’s combustion engine is in the range of 1 to 135 hp (.75 to 100 kW), you should be able to find an electric substitute.

While electric boating hasn’t gone mainstream—it’s estimated that close to 2% of recreational boats are electric—it’s still a great time to be thinking about making the switch, particularly if you own a tender, sailboat, or boat on a green lake where combustion engines are prohibited.

Table of contents

• 1.1 Benefits
• 1.2 Drawbacks
• 2.1.1 Key features of electric outboard boat motors
• 2.1.2 Electric outboard manufacturers
• 2.2.1 DIY electric inboard boat motor conversion
• 2.2.2 Key features of electric inboard boat motors
• 2.2.3 Electric inboard manufacturers
• 2.3.1 Serial vs. parallel hybrids
• 2.3.2 Key features of marine hybrids
• 2.3.3 Marine hybrid manufacturers
• 2.4.1 Electric pod and sail drive manufacturers
• 3 Batteries
• 4 Ready to catch the electric boating wave?

Benefits and drawbacks of electric boat motors

Electric marine motors offer several advantages over internal combustion engines:

• They’re completely silent .
• No noxious fumes or smelly exhaust gases to deal with.
• Instant torque.  Electric propulsion provides instant torque, giving you better maneuverability and more consistent speeds in choppy conditions.
• Lightweight.  An electric setup (including motor, batteries, and generator) typically weighs less than its diesel counterpart.
• No fuel cost.  Charging an electric boat may cost a couple of dollars per charge.
• Easy to maintain.  Imagine the maintenance on an outboard with no gas, spark plugs, or oil! Electric motors are simple, more reliable, and virtually maintenance-free.
• Renewable power.  Once you’ve gone electric you can get power from renewable sources like wind generators and solar panels.
• Better for the planet.  Electric marine motors don’t produce water pollution or produce harmful emissions like carbon dioxide (CO2), nitrogen oxides (NOx), and hydrocarbon (HC).

• Range.  The greatest drawback of electric boats is their limited range, which is often measured in the 10s of miles. Range is limited because batteries don’t have the same energy density as fuel — they can’t provide the same energy, pound-for-pound as a tank of gas. A good battery monitoring system, one that displays the remaining range in real-time, can help boaters manage energy consumption and ease range anxiety. For those who want to go farther afield, hybrid propulsion may be a better option.
• Upfront cost.  This new technology isn’t cheap. For example, a small electric outboard boat motor may sell for two-and-a-half times the cost of a gas outboard. However, prices are expected to come down as the industry reaches scale.

Types of electric boat motors

Electric outboard boat motors.

Some of the first electric outboards to hit the recreational boating market were smaller electric motors, typically used as trolling motors on fishing boats.

Today,  it’s possible to buy far more powerful electric outboard motors in the 1 to 80 hp (.75 to 60 kW) range , with ever more powerful versions hitting the market each year. In 2022, Norwegian start-up, Evoy launched the world’s most powerful outboard to date, the 225kW Storm, a 300-hp beast of an electric outboard! 

The range on electric outboard boat motors varies dramatically depending on your boat, total weight, propellor, and battery capacity .

The range also depends on how fast you want to travel. If you go slowly you’ll have a much greater range.

For instance, at a slow speed (5 knots) Torqeedo’s Deep Blue 50R , a 50 kW motor (80 hp equivalent) with a 40 kWh battery, has a listed range of 33-100 nm. But at full throttle (20-25 knots), the listed range drops to 16-20 nm.

To get a better sense of what range to expect on your boat (at both low and high speeds), you can look at the manufacturer’s website. See our list of electric outboard brands below.

One of the great things about electric outboards is that they can use renewable power sources. So, for instance, you could plug your boat into a portable solar panel while picnicking and get an extra boost for the trip home.

Some electric outboard boat motors can even generate power! Motors with hydro regeneration capabilities can charge the batteries while the boat is being towed or under sail.

While hydro regeneration is a fairly new feature for electric outboards, some manufacturers, like EPropulsion, are offering it across their outboard product line.

Key features of electric outboard boat motors

Each electric outboard motor brand has slightly different standard offerings and add-on features. Here are some of the key features and options to look for.

• Waterproof.  Some electric outboards are fully sealed and designed to withstand immersion
• Remote controls. Choose between tiller and remote throttle controls
• On-board computers . Some electric outboards come with chartplotter connectivity, navigation functions, sonar, GPS anchoring, and autopilot features
• Built-in or stand-alone batteries.  Some of the smaller motors come with built-in batteries, while the larger ones have separate battery packs
• Battery monitoring and tracking systems  that calculate and display the remaining range in real-time
• Shaft length.  Electric outboards come in both short and long shaft lengths to accommodate a variety of applications.
• Hydro regeneration capabilities 

Electric outboard manufacturers

These electric outboard boat motor manufacturers (listed in alphabetical order) range from small startups to large companies and serve the North American market.

If you’re looking to learn more about what each of these companies offers (and how they compare) I’d highly recommend checking out the  Plugboats’ electric outboard guides and directories . Jeff Butler, the editor at Plugboats has done a great job of compiling motor specifications from across the market.

Headquartered in San Diego, California,  Bixby  makes a small electric motor system for kayaks, inflatable boats, canoes, and paddleboards.

Elco  has been building electric motors for 125 years and counts the likes of Henry Ford and Thomas Edison among their customers. Their award-winning electric marine motors range from 5 to 50 hp. The company is based in Lake George, New York, and its electric motors can be found on boats around the world.

Flux Marine

Flux Marine was founded by mechanical engineering Princeton grads and offers three outboard models—a 40 hp, 70 hp, and 100 hp. In 2021, they won an award for the best new green product at the Newport International Boat Show.

Joe Grez, a consumer product developer from Washington, invented the  EP Carry , a compact, ultralight electric outboard system because he was concerned about exposing his young daughter to the carbon monoxide (CO) emissions produced by gas outboards.

The EP Carry retails for $1,600 and is a great size for small vessels like dinghies, canoes, inflatable boats, and kayaks.

ePropulsion

ePropulsion , based in Guangdong, China, manufactures 3 to 9.9-hp electric motors for sailboats, fishing boats, as well as dinghies and tenders. They all come with hydro regeneration capabilities.

Mercury Marine launched the Avator 7.5 electric outboard (3.5 hp equivalent) in early 2023. The leading outboard manufacturer is currently developing more powerful 20e and 35e models which it plans to release later this year.

In 2023, Newport , a well-known US-based inflatable boat manufacturer, launched three small outboards ranging from 1.8 to 3 hp.

If you’re into fishing, you’re probably familiar with the Minn Kota  name, derived from MINNesota North DaKOTA, prime fishing country where the company has its roots. They introduced their first electric trolling motor back in 1934 and they’ve been making them ever since.

Pure Watercraft

Pure Watercraft  was founded by CEO Andy Rebele in Seattle in 2011. Their 25 kW (50 hp) motor starts at $16,500.

Ray Electric Outboards

Ray Electric Outboards is a 3rd generation family-owned business based in Cape Coral, Fl. They manufacture one outboard model that can be operated at different power ratings ranging from 10 to 22 hp.

Stealth Electric Outboards

The 50 and 75-hp  Stealth electric outboards  were developed by Scott Masterston of Houston, Texas.

German manufacturer,  Torqeedo , has been leading the propulsion industry for years and sells some of the best e outboard motors in the 1 to 80-hp range

Vision Marine Technologies  (formerly The Canadian Electric Boat Company). 

Based in Quebec, Canada,  Vision Marine Technologies  has been in the boating industry for 25 years and produced some very innovative electric boats. In 2021, they launched E-Motion 180E, one of the most powerful electric outboards on the market.

Electric inboard boat motors

Today’s electric inboard motors can provide anywhere from  3- to a whopping 330 hp (2 to 246 kW)  and are used in a range of applications from heavy displacement vessels to fast, planing powerboats.

Similar to outboards, the range on electric inboard engines will vary based on your boat, load, battery capacity, and boat speed (among other things).

However, with an inboard electric boat motor, you have the option of a hybrid motor which can significantly extend your range. We’ll discuss the pros and cons of hybrid boat motors later in this post.

Sailors may also want to consider choosing an inboard electric motor with hydro regeneration capabilities. These electric power motors can charge the battery while the boat is under sail.

DIY electric inboard boat motor conversion

One way to save money on an electric inboard is to do the installation yourself. There are a few DIY electric inboard boat motor conversion kits available on the market.

I’ve spoken with a few sailors who’ve had great success replacing their inboard diesel engines with these electric boat motor conversion kits from  Thunderstruck-EV , an electric drive manufacturer in Santa Rosa, California.

Key features of electric inboard boat motors

Each brand has a slightly different set of electric inboard motor options. Here are some of the key features and options to look for.

• DIY conversion kits
• On-board computers  and touchscreen display
• Waterproof  system components

Electric inboard manufacturers

US manufacturer, Elco Motor Yachts , has been building electric motors for over 125 years, having gotten their start in 1893, supplying electric boats for the Chicago World’s Fair. They have seven inboards ranging from 6 to 200 hp.

Electric Yacht

Electric Yacht  is a US supplier focused on providing plug-and-play electric motors for DIY installations on sailboats. Their electric propulsion systems range from 10 to 30. They’ve had over 450 installs in 10 years of production.

Oceanvolt  is a leader in regenerative systems and their electric inboard motors are popular among sailors. They offer shaft drive systems ranging from 6 to 60 hp.

Torqeedo, a German manufacturer, is the world’s leader in electric boat motors. They have two lines of inboards, one for displacement boats and another for fast planing boats. Their Deep Blue inboard systems range from 25 kW to 100 kW (40 to 135 hp)

Hybrid systems

Hybrid systems combine an electric motor and combustion engine, so you can cruise in silence (but know you’ve got enough gas to get home). These systems offer  many of the benefits of pure electric motors, without the limited range. 

If you want  additional power for onboard luxuries  like air-conditioning, hybrids can also provide a significant increase in house-side fuel efficiency.

The downside to any hybrid solution is that the systems are far more complex . Not only do they require more equipment, but, for an optimized system, you’ll need highly sophisticated software to manage multiple power sources and switch back and forth between diesel and electric.

Unsurprisingly, the increased complexity adds cost, making hybrids less economical than either a conventional or pure electric install.

Serial vs. parallel hybrids

As with cars, there are  two types of hybrid systems: serial and parallel.  A serial hybrid uses a generator to power a large electric motor connected to the drive shaft. Whereas, a parallel hybrid has both a conventional combustion engine and a small electric motor connected to the drive shaft.

There are plenty of factors to consider when choosing between a parallel and serial system. Marine mechanics and electrical expert, Nigel Calder, does a great job of explaining  serial and parallel hybrids  in detail.

In general, serial systems may be a better fit for boats that can get most of their propulsion energy from renewable sources (e.g., a sailing catamaran). Whereas, a parallel system makes more sense on boats that regularly require sustained propulsion (e.g.,  Greenline’s power yachts ).

Key features of marine hybrids

• Parallel and serial hybrid options
• Integrated energy management  systems

Marine hybrid manufacturers

Elco motor yachts.

Elco  manufactures serial, parallel, as well as a combined serial-parallel system. Their systems can be used on sailboats, trawlers, yachts, and boats up to 85′ feet.

Hybrid Marine Ltd.

Hybrid Marine  sells parallel hybrid systems in the 10 to 230 hp range. Beta, John Deere, and Yanmar’s hybrids all incorporate Hybrid Marine technology.

Finnish manufacturer,  Oceanvolt , offers serial hybrid systems for both sailboats and powerboats.

Torqeedo  makes hybrid systems for yachts up to 120 feet as well as powerful motorboats.

Electric pod drive and sail drive

Several manufacturers are now making electric pod and sail drives. These electric drive systems are more efficient and can save space onboard.

Electric pod and sail drive manufacturers

Electric Yacht  produces a range of sail drives that can replace diesel engines up to 75 hp.

propulsion  sells a 3 hp, 6 hp, and 9.9 hp fixed pod drive.

Oceanvolt’s  sail drives range from 6 kW to 15 kW (8 to 20 hp)

Torqeedo  sells a 40 hp and 80 hp equivalent electric sail drive as well as electric pod drives in the 6 to 25 hp range.

While it’s possible to power an electric motor with a conventional lead-acid battery, there are many  good reasons to upgrade to lithium-ion batteries.

Their increased usable  capacity is roughly double  what you can get out similarly sized lead-acid battery. More battery capacity means more range—and hours of fun—on your electric boat.

They also  charge more quickly  and have a  longer life span  than lead-acid batteries. Unlike flooded lead-acid batteries, which need to be watered, lithium-ion batteries are practically maintenance-free.

The downside is that lithium-ion batteries are far  more temperature-sensitive  and can’t be charged much above 113 F (45 C) or below 32 F (0 C).

They  can also present major safety issues . Lithium-ion batteries can go into what’s known as thermal runaway—a self-heating process that can cause the battery to catch fire.

Simply put,  lithium-ion batteries are NOT a drop-in substitute for lead-acid batteries.  They need to be specially designed for the marine environment and paired with a robust battery management system.

Electric motor manufacturers often provide complete solutions (including motor, batteries, and battery management system). It’s a good idea to work with a manufacturer with extensive marine experience and an ABYC-certified technician on any installation.

The other catch is that lithium-ion batteries  cost two to four times   as much as lead-acid  batteries. However, the increased capacity and longer life span may make lithium batteries a better value option over the long run.

Ready to catch the electric boating wave?

With ever more powerful and feature-packed electric options launching each year, it’s an exciting time to be in the market for a new motor or engine. If you have any doubts about whether an electric boat motor is right for you, head to your local boat show and see, first hand, what all the buzz is about.

Fiona McGlynn is an award-winning boating writer who created Waterborne as a place to learn about living aboard and traveling the world by sailboat. She has written for boating magazines including BoatUS, SAIL, Cruising World, and Good Old Boat. She’s also a contributing editor at Good Old Boat and BoatUS Magazine. In 2017, Fiona and her husband completed a 3-year, 13,000-mile voyage from Vancouver to Mexico to Australia on their 35-foot sailboat.

Douglas McQuilken

Sunday 30th of January 2022

Great article!

For those who wish to collaborate with prospective & current electric boaters, highly recommend this forum - https://groups.io/g/electricboats

Thanks for the suggestion, Douglas!

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Based in Hopkins, Go-Float boats garnered their some of their first brand exposure on and around Lake Minnetonka.

Go-Float has signed four new U.S. dealers and one Israeli resort to sell the company’s electric boat motors , the company announced Wednesday.

The additional dealers are part of growing success the company credits in part to this year’s outboard electric motors boats shows. Prior to the shows, it introduced four new models for 2012 with prices below $5,000. Its production team has doubled in size and expects to quadruple in 2012.

“Our boat show results for the  outboard electric motors  have been better than expected. We are signing new dealers and those dealers report that they’ve sold  outboard electric motors  boats within days of receiving their first shipment,” a news release quoted Steve Hendrickson, Go-Float’s general manager. “Our vision of  outboard electric motors  boating is connecting with all types of people and we are thrilled to see the growing interest in Go-Float and our outboard electric motors .”

Based in Hopkins, Go-Float electric outboard motors boats garnered their some of their first brand exposure on and around Lake Minnetonka. Go-Float launched to provide environmentally friendly watercraft to boaters by using electric boat motors . It initially offered just two models. The $1,995 SL1 resonated with those who wanted a slower, more-relaxing experience on the water, while the $9,495 RX1 could reach speeds up to 20 mph and was capable of pulling a water skier.

The four 2012 models range from the $1,895 Ion with a top speed of 4 mph to the $16,995 Vector that can go up to 22 mph.

When 5 th  District Rep. Keith Ellison visited the company in the middle of April, officials described a booming business that was in talks with companies in regions ranging from Scandinavia to the Mideast. MSD

Well, it's not a sailing boat, but their hearts are in the right place. Duffy Down Under Pty Ltd is introducing a new Duffy Electric Boat model to Australia at the Sanctuary Cove International Boat Show 24-27 May in Berth D/E2 at the main marina.   This is the first time this electric boat motor  will be displayed at the boat show, which is one of the primary boating events in Asia Pacific. The electric boat motor were also seen last week on the television show The Great South East.  The Duffy 22 Cuddy Cabin is being formally introduced to the Australian market for the first time. This spacious model is the flagship of the Duffy fleet, which offers unrivaled elegance, performance and innovation. The 22 Cuddy is equipped with the Patented Power Rudder, for unparalleled maneuverability, turning within its own length. You will not find more space, charm or performance capability in any other electric boat motors  in the world. ( electric motor for boats , electric outboard motors for boats ) Duffy Boats are dominant in harbors, lakes, and protected areas around the globe. Clean and quiet this model can hold up to 12 adults making it ideal for family outings, romantic cruises, entertaining or just exploring the wonderful Australian waterways.  'Duffy Electric Boats aren’t just an electric outboard boat ,' explained Nitsa Kerr, Duffy Down Under’s general manager, 'they are a lifestyle. It’s like having your own limo on the water.' Each Duffy Electric Boat comes complete with full canopy top, full windowenclosures and a CD player with an iPod hookup. The electric boat motor  cruises an average of 75 kilometers between charges, and the batteries recharge overnight for less than a few dollars AUD. 

Gordon Kerr, Duffy Down Under chief executive. 'Duffy Electric Boats are ideal because of their zero emissions. They work harmoniously in the Gold Coast Marine Park with its varied fish life, dolphins, turtles and whales. As an added bonus, the electric boat motor  is allowed in the Gold Coast areas where petrol-powered boats are forbidden.'  'In my 40 years in business travelling the world, I can tell you the Australian Gold Coast is perfect for our outboard electric motors . I firmly believe Duffy Electric Boats and the new Duffy 22 model will be ideal for those waterways,' noted Marshall 'Duffy' Duffield, company founder.  About Duffy Down Under Pty Ltd   Duffy Down Under is introducing Duffy Electric Boats to the Queensland marketplace by raising the profile and awareness of these unique outboards electric motors , which are available for sale and also for hire seven days a week (weather permitting). The company also offers catering in partnership with local restaurants as well as group events and theme events. The company is has two locations at Mariners Cove Marina, Shop 4, Main Beach, Gold Coast, Queensland 4217 and Marina Village, 39B The Promenade, Sanctuary Cove, Queensland 4212.  More at  duffydownunder.com.au   About the Duffy Electric Boat Company   Duffy Electric Boats, America’s largest electric boat motor  manufacturer, has been in  business since 1970. The company currently produces over eight different electric  boat motors models. Each Duffy model is constructed from the highest quality materials in a  company-owned factory located on over six acres in Adelanto, California. Duffy  electric boat motor are emissions-free and low-maintenance. ( electric motor for boats , electric outboard motors for boats )

by Duffy Down Under   MSD

This article explains the basic features and benefits regarding the latest developments in lithium ion battery technology which are now available for use with electric boat motors .

Up to the present time the electric boat motor owner has only had available one type of battery chemistry to provide propulsive power for their electric boat motor no matter whether the electric boat is an inboard or outboard motor. This battery type is of course the lead acid battery. There are two main variations to the lead acid battery depending upon its specific application.  Broadly speaking the lead acid engine start or "cranking battery" in its intended application is designed to provide a short, high power burst of electrical current to crank over either a petrol or diesel engine while starting. The other main type of lead acid battery is the deep cycle or gel/AGM type which is used to provide sustained power for electrical devices and equipment over a long period. This is the type of battery which commonly provides house power on boats as well as presently being the most common type to power electric boat motors.

Both types of lead acid batteries however have severe limitations.  Lead acid batteries are extremely heavy and while weight may not be an important factor for batteries in a stationary environment, for use in a motive application such as an electric boat motor , having to move (accelerate/decelerate) such a heavy dead weight does not make much common sense. In addition lead acid batteries contain nasty chemicals such as sulphuric acid and toxic heavy metals like lead which are potentially hazardous to the environment.

Lead is a very heavy metal and for many years the search has been on to make a better battery that is also lighter in weight. Lithium is the logical choice since it is the lightest metal known to man. However in addition to being extremely light in weight, lithium is also extremely reactive and for this reason pure lithium metal is never found in nature.  Lithium metal is manufactured from lithium salts which are extracted through mining activities mainly from brine lakes. It can also be extracted from sea water.

Lithium ion batteries have been available for several years for many consumer applications which most people would be familiar with. As with lead acid batteries, lithium ion batteries also are available in several chemistries, each having their particular good and bad points. The earliest lithium battery chemistries which became a commercial reality and which are still in use today for consumer items like mobile Lithium Iron Phosphate (LiFePO4) 

Batteries for Electric Boats by Armin Pauza, EBAA business member Energy density comparison phones, notebook computer and camcorders etc. are cobalt oxide lithium ion batteries. Li-Co batteries have high energy densities but have the disadvantage that in large format applications and in cases where many separate cells are used which can potentially become unbalanced during several charge cycles, they can pose a dangerous risk of fire or explosion is a possibility. While these batteries are generally considered quite safe in small format applications such as for mobile phones and the like (generally one cell only is used therefore this is why the battery voltage of a typical mobile phone battery is 3.6 -3.7 volts) there could be disastrous consequences should a large lithium battery of this chemistry fitted to a boat catch fire. ( electric motor for boats

In the mid 1990's Dr John B Goodenough and his research team from the University of Texas developed material used to make the Lithium Iron Phosphate battery (LiFePO4 for short). Dr Goodenough patented his invention and gave permission to Phostech Lithium/Hydro Quebec Canada to manufacture this material in commercial quantities for the production of LiFePO4 batteries which would be a superior replacement for lead acid batteries. 

Unlike the hazardous nature of the earlier chemistry lithium battery types, lithium iron phosphate batteries are extremely stable and safe to use. This safety combined with their light weight has found wide use for these batteries for military applications and now for the emerging electric vehicle markets including electric boats. They are in fact even safer than lead acid batteries and do not suffer from some of the problems which are inherent to lead acid batteries such as, thermal runaway, sulphation when left in a discharged condition and high rates of self discharge if not used. Lead acid batteries generally have a life of only a few hundred deep charge cycles while a quality LiFePO4 battery can typically be charged in excess of 2000 times. ( electric motor for boats )

Though not as high in energy density as the earlier lithium battery types, the lithium iron phosphate battery still has a far higher energy density compared to the lead acid battery as can be seen from the graph on the left.  

In recent years large format LiFePO4 batteries have been made to replace lead acid batteries and these batteries are now being widely used for  battery packs to power electric vehicles as well as hybrid electric cars. They are also being used in high power electric cordless power tools. 

The benefits to the boat owner of a quality LiFePO4 battery are many.  Lithium iron phosphate batteries are a truly multi-application battery type so the one battery or battery bank can be used to provide propulsive power for the electric motor for boats /s as well as to supply all the electrical loads on a boat. Normally the electric motor requires a voltage of 36V, 48V or higher voltage while 12V is required for house power, radios, Lithium battery bank navigation lights, etc. In this case a suitable DC/DC converter should be used to provide the lower voltage from the higher voltage main battery bank. It is very bad practice and still used by some manufacturers to simply tap off 12V from a single battery in the main battery pack to supply this lower voltage. This can lead to uneven discharging of different batteries due to varying loads which can further result in some batteries being over charged while others end up being less than fully charged. By fitting a DC/DC converter all batteries are discharged evenly regardless of varying loads. This will result in the longest life from all batteries and will minimise the chances of individual batteries failing prematurely which is a strong possibility if a DC/DC converter is not used.

Another major factor which should be taken into consideration when replacing a lead acid battery with a LiFePO4 battery is that due to the higher energy density and greater performance of the lithium battery often a smaller battery can be used which will provide equivalent or better performance compared to the original lead acid battery. For many applications a 60Ah LiFePO4 battery will provide equivalent performance to a 100Ah lead acid battery. This difference in performance can clearly be seen if both battery types are compared side by side in high current drain applications (for example if used to power an electric boat motor at high power settings). What many people fail to realise about a lead acid battery is that its capacity (Ah) rating is usually specified at the 20 hour discharge rate. At high rates of discharge the effective or "real" battery capacity is reduced considerably due to "Peukert's Effect". A typical 100Ah lead acid battery when discharged in an hour or two may have an actual measured capacity of as little as 60-70Ah. LiFePO4 batteries are not negatively affected in the same way by Peukert's Effect as are lead acid batteries. ( electric motor for boats )

When a lead acid battery is connected to a load (such as an electric motor for example) the voltage slowly continues to decrease until the battery is completely discharged. By contrast the discharge characteristic of a LiFePO4 battery is quite different. The discharge curve of LiFePO4 battery is close to being linear for about 90% of its capacity. Therefore a LiFePO4 battery can be almost fully discharged yet it will provide very close to the same power as when it was fully charged. During the last 10% of the batteries capacity the voltage will drop very suddenly. 

Another great benefit of Lithium Iron Phosphate batteries for boating applications is due to their inherent safety features. Since they do not produce flammable hydrogen gas under any circumstances (even if overcharged) a LiFePO4 battery can be safely installed in a confined place in a boat or ship without fear of a fire or explosion occurring. There is absolutely no maintenance required so a battery can be fitted into an out of the way space in an electric boat such as under seats, under stair wells, in the hull, etc. Due to slim cylindrical nature of many LiFePO4 cells a custom battery of virtually any shape can be made which will fit into any tight space in an electric boat . Battery cells can even be fitted inside a mast or inside hollow railings. ( electric motor for boats )

Another advantage of LiFePO4 batteries is their rapid charge capability. High quality batteries can be re-charged extremely quickly. In fact premium quality LiFePO4 batteries can be re-charged from a completely discharged state to more than 90% fully charged in only fifteen minutes with a suitable fast charger from shore power. Of course they can also be more slowly trickle charged by solar panels or more quickly aboard the boat via an engine driven back up generator/alternator. A deeply discharged deep cycle/AGM lead acid battery can only be re-charged in a matter of hours and not minutes. For many electric boats this rapid charge capability will be a godsend. 

Weight is another factor of concern to owners of electric boat motors . A Lithium Iron Phosphate battery is usually about half the weight of an equivalent capacity lead acid battery. For example the photo of the battery bank below shows a large LiFePO4 battery bank used to power three motors fitted to a 55ft electric racing catamaran. It was originally planned to fit more than half a ton of AGM lead acid batteries to this boat before the owner learned of the benefits of LiFePO4 batteries. Due to the many benefits the owner of the boat decided to install LiFePO4 batteries instead and was able to reduce the total weight of the battery bank by more than half with the total of all twelve batteries weighing in at less than 200kg.

To sum up, an overview of the benefits of Lithium Iron Phosphate batteries: 

• Safe technology, will not catch fire or explode with overcharge  

• Over 2000 discharge cycles life compared to typically around 300 for lead acid 

• Double the usable capacity of similar amp hour lead acid batteries  

• Virtually flat discharge curve means maximum power available until fully discharged (no "voltage sag" with time as with lead acid batteries).  

• Unlike lead acid batteries, can be left in a partially discharged state for extended periods without causing permanent damage 

• Extremely low self discharge rate (unlike lead acid which will go flat quite quickly if left sitting for long periods)  

• Does not suffer from "thermal runaway"   

• Can be used safely in high ambient temperatures of up to 60 deg.C or more without any degradation in performance  

• Can be connected in series for higher voltages or parallel for higher capacity. 

• Absolutely maintenance free for the life of the battery 

• Can be operated in any orientation  

• Does not contain any toxic heavy metals such as lead, cadmium, nor any corrosive acids or alkalis thus making LiFePO4 batteries the most environmentally friendly battery chemistry available 

• LiFePO4 cells are of solid construction. There are no fragile/brittle plates made of lead which can be prone to failure over time as a result of vibration. 

• Can be safely rapidly recharged. When fully discharged can be re-charged to more than 90% full battery capacity in only 15 minutes.

There are already several brands of LiFePO4 batteries which are available to boat owners and are suitable for powering many kinds of electric motors from tiny trolling motors to large inboard electric motors of several horsepower. The prospective battery purchaser should be aware that the majority of the LiFePO4 batteries manufactured in China are of very poor quality and correspondingly provide poor overall performance. These batteries will also have a shorter life than a quality LiFePO4 battery. Only high quality LiFePO4 batteries should be used by the electric boat owner so as to provide peace of mind in terms of battery reliability. One way a battery buyer can gauge the quality of any particular battery brand is to check what kind of warranty the manufacturer/supplier will provide and whether it is a factory backed warranty or only a distributor backed warranty in the country of sale since many distributors of Chinese batteries are required by law to provide a minimum warranty period when a battery is sold in a western country. If a battery manufacturer is not prepared to stand behind their own products by providing a lengthy factory backed warranty then it is best to steer well clear of these companies so as to avoid any possible headaches in the future.  ( electric motor for boats )

Chinese battery cell manufacturers will often assemble their cells using less expensive manufacturing techniques thereby reducing the final cost of the battery to the customer at the expense of shorter cycle life and/or poorer performance. For example some manufacturers will simply crimp end terminal caps on the cells while other manufacturers will spot weld or even fully laser weld the cell ends. Obviously a cell which is merely crimped will be cheaper to manufacture than a cell which is fully laser welded. By the same token the crimped cell is also more prone to fail prematurely due to slow ingress of moisture, humidity and other atmospheric contaminants which in a laser welded cell are totally excluded from entering the cell for the life of the cell.  It really is a case of having to pay more for quality. By paying more for a quality battery a great deal of frustration can be avoided and allow the electric boat owner to enjoy the tranquillity of silent, electric boating without any noise or exhaust fumes. There are a handful of manufacturers of A-grade quality Lithium Iron Phosphate batteries which will outlast several lead acid batteries and provide vastly superior performance and thereby bring much enjoyment to the owner of the electric boat they are fitted in.  

Lithium Iron Phosphate batteries are sure to revolutionise and bring about the growth of the electric boating market in the years to come. ( electric motor for boats )  MSD

Electric boats are definitely not a new concept. What is believed to be the very first marine outboard motor was invented in 1880 by a French inventor, Gustave Trouve, and it was electric. In the early 1890's electric boats were first introduced in the United State with the formation of the  Electric Launch Company (Elco)  in Bayonne, New Jersey. It was the Chicago Exposition in 1893 that put them on the map. Elco was requested to build fifty-five (55) 36-foot electric launches for this event. Ticket sales to transport people around the Chicago area lakes and rivers exceeded 1,000,000.

That was over 120 years ago and at that time electric motors were the preferred form of propulsion. The electric "Picnic Launch" became the essence of a perfect lake cruise. Elco's company records reveal that Thomas Edison, John Jacob Astor, Admiral Dewey, George Westinghouse, and the Grand Duke Alexander of Russia were all owners of Elco electric launches.

There were, of course, steam engines that were very powerful, yet heavy, a lot of work and not conducive to a pleasant cruising experience - especially when their boilers would explode. In the late 1800s, there were also gasoline engines. These engines at that time were called "Explosion Engines". The names were later changed to "Gasoline Engines" to make them sound safer, and more appealing to the consumer.

After about 1920, gasoline and diesel engines became the primary propulsion units for boats - but they could never offer the quality of the electric cruising experience. At that time, electric boats lost their following, because the batteries could not carry enough energy to match the horsepower of the internal combustion engine - as folks became more intrigued with speed at the expense of comfort and quality of the boating experience.

However the Navy's submarines continued to rely heavily on electric propulsion - because it is fundamentally reliable, efficient, and quiet. Later on, Navy ships and commercial vessels returned to electric propulsion systems for the same reasons - but using generators to create the electricity.Today, the Queen Mary II is powered exclusively with electric motors that generate 157,000 horsepower.

So electric propulsion is not a "new concept" and is considered by far the most reliable form of propulsion. Not only is electric propulsion reliable and efficient, it offers the ultimate pleasure boating experience: relaxing, quiet, and NO smelly fumes. For these reasons combined with the advances in battery technology, electric pleasure boating has enjoyed a revival over the passed few decades.

Several companies, including  Duffy Electric Boats,  considered the industry leader of this revival since 1970, have resurrected the electric launch and other more contemporary designs.

Electric boating has become the boating lifestyle of choice for many thousands around the world in many different venues for the mainstream population.

Before starting Tamarack Electric Boats, Montgomery Gisborne was interested in electric cars, but now he's focused on the water. Since 1993, Gisborne has been involved in the technical aspects of electric vehicles in Canada. Gisborne has been competing in the American version of the Tour del Sol since 1997, placing first in 2003, and he even created a similar race called the Canadian Clean Air Cruise.

To date, Gisborne has logged over 31,000 miles of travel in electric vehicles. But he's not only concerned with cars. In 2003 he built one of the world's first electric snowmobiles, and two years later he founded Tamarack Electric Boats. We've covered solar boats many times, and the company's latest invention, the Loon, caught our eye and when given the opportunity, we thought readers would like to know more about a man who designs such interesting electric vehicles.

EarthTechling (ET):  You have an extensive background in electric cars, what made you want to start an electric boat company?

Montgomery Gisborne:  Having built electric cars and electrified many other devices such as a snowmobile, I was always looking for a business opportunity in the mix. I had thought of building electric cars for a living, especially after coming in first in the 2003 American Tour del Sol electric car rally, but the reality that you cannot become GM overnight settled in. After much deliberation, I decided that the idea of a solar-powered boat must be a good one, perhaps my best, so I decided to build me first solar boat as a "science project" in 2005. The boat worked so well that I little choice but to purse it!

ET:  Was there any specific reason that you were looking to move the company from Canada to the United States?

Gisborne:  Sure, more people, water and sun. I think that we brought our ideas to NYS at a time when Canada seemed to focus its attention the Athabasca Tar Sands, and NYS was looking for sustainable product projects to create sustainable jobs. Then there's this crazy little piece of legislation which was brought into the North American Free Trade Agreement (NAFTA) called the Jones Act which prohibits Canadian companies from selling boats into the US, so we had a triumvirate of good reasons to move across the border.

ET:  Was the NYSERDA incentive program the biggest draw to relocate to Rome, NY?

Gisborne:  No, probably not. You may have heard the old expression that "it takes a village . . . " I believe it is very true. When I passed through Rome on my solar trek across the state in 2007, i was overwhelmed by the reaction and enthusiasm of the people, more so that anywhere else I had traveled in my solar boats (which says a lot). The entire town seemed to make time to be there to catch our lines as we tossed them to shore, which really impressed me. The mayor of the town clearly saw the vision and has done more than we could ever have expected to convince us that Rome is our home. Incidentally, the first shovelful of earth removed in the construction of the Erie Canal was taken out of the ground pretty much in font of our shop on July 4th, 1817.

I think we would have made the move anyway, without NYSERDA funding, but the funding made it possible and got us started much quicker than if we had to go it completely alone. The funding is great, but it takes more than money to create an industry, it takes drive and determination beyond my own.

ET:  Why did you decide on solar-power for the Loon above other electric options?

Gisborne:  There are so many reasons that make solar a natural on an electric boat. People look at my boats and say, "Oh, I get it, when the is moored at the it is picked up a free charge." While this is certainly true, the rationale for the solar goes far beyond that. For example, it dramatically reduced Peukert Effect on lead-acid batteries. Without getting into a long-winded technical discussion, this effect has a negative effect on batteries when the boat is under power, reducing the instantaneous capacity of the energy storage cells, and the solar input helps to reduce that effect, thus increasing the effective range the boat can travel on a given charge. This also helps the lead-acid batteries to better compete against other chemistries, such as nickel and lithium-based batteries at lower expense.

I hate oil is the reason why I eschew any internal-combustion options. It is the greatest detriment to the North American economy and a threat to world peace.

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STUART — When St. Petersburg boaters Nancy Frainetti and Jeff Springfield pulled up to the fuel dock at Hutchinson Island Marriott Marina in Stuart Tuesday afternoon, one thing was noticeably absent — engine noise.

A leisurely cruise from the River Forest Yachting Center on the St. Lucie Canal in Tropical Acres to the Marriott served as the final leg of the 8-day, 250-mile “Cruise to the Atlantic.”

Frainetti and Springfield, owners of Endeavour Green, builders of electric hybrid yachts, left St. Petersburg June 16 and traversed the Okeechobee Waterway in their 24-foot boat while using only $16 in electricity and a few gallons of diesel fuel.

“We did this to show people that this is not a ‘toy boat,’” said Springfield, a longtime captain who said many boaters think electric-powered boats are typically for small lakes and short trips. “A typical boating family might enjoy a 20-mile trip. We had legs of this trip of 40, 47 and on Monday, 52 miles in a day.”

The technology behind the Endeavour involves a 48 volt array of batteries that turn the 13 horsepower D & D motor. The electric motor uses a twin belt setup to turn the drive shaft for a 3-blade bronze inboard propeller.

The batteries can be charged at home or marina by plugging into a 110 volt outlet. To recharge the batteries while under way, a 3.5 kilowatt Master Volt Whisper diesel generator is employed. During the 8-day trip, Springfield said only nine hours were put on the generator and at 3.8 hours per gallon, they needed less than three gallons of diesel.

The Endeavour provided comfortable passage, Frainetti said, despite record heat during their trip. A full-length canvas top — one that can fold down and serve as a boat cover when not in use — shades a large area.

“We endured a little weather — but that’s something boaters are used to handling,” Frainetti said. “It got a little hot out on Lake Okeechobee Monday, but we managed to keep it from baking our brains.”

Frainetti said that although the Endeavour has Eisenglass and air conditioning, they survived without it.

Frainetti said she saw several manatees during the trip and counted 38 alligators while crossing Lake Okeechobee.

Springfield said the hybrid technology is receiving a lot of interest from the boating community. He said that one selling feature is the simplicity of its design.

“It’s an easy boat to own,” Springfield said. “It’s very simple — there are no complex systems. All the electrical components are solid state design. There are no fumes, vibration or noise. And because you are carrying little or no fuel, insurance rates are great.”

For more information visit EndeavourGreen.com or call (727) 573-5377.

A brand new boat making waves in South Florida, and it runs on batteries. The Endeavour Green Company, part of the Endeavour Catamaran Corporation, showed off it's "green" boat. Co-owners, Nancy Frainetti and Jeff Stringfield, traveled from Saint Petersburg to Stuart. They did it all on battery power, no gas or diesel fuel needed, unless you want to use the back-up generator on board. The Endeavor Green Company created the boat, which is equivalent to a gas or diesel fueled deck boat. The starting cost is around $42,000. The owners say it's well worth the price, and it helps the environment. Endeavour Co-owner, Nancy Frainetti, says, "We have no emissions on the electric propulsion. So, it's as green as can be. What a wonderful benefit."

The boat is also decked out with a bathroom on board and air conditioning. It charges up each night, and usually costs only $1.50. Take that versus a gas or diesel engine that could cost you anywhere from $50 to $75 dollars a day to gas up.

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Saildrive propulsion systems

The most powerful electric sail drive system from serial production.

Perfectly matched system integration rather than an assortment of components

The most powerful electric saildrives come from Torqeedo series production. The Deep Blue 25 SD propels sail yachts of up to 40 feet in length to speeds of up to almost ten knots (18 km/h), or smaller boats even faster when planing. This makes cruising with large sail yachts completely emission-free with virtually no noise or vibration. The Deep Blue 50 SD offers twice the performance. The Deep Blue sail drive is part of a completely integrated comprehensive system that was developed using industrial engineering methods, comprises high-tech components and which is manufactured in series production.

Deep Blue Saildrive for sailboats and catamarans

Light and quiet.

With an overall weight of about 125 kg for motor, sail drive and electronics, the Deep Blue 25 SD (50 SD ≈ 180 kg) weighs less than a conventional saildrive with combustion engine. This benefits weight distribution on board, as the low net weight of the Torqeedo Deep Blue Saildrive makes a sailboat noticeably lighter at the stern than a similar configuration with a petrol or diesel engine when the motor is installed toward the rear. The weight of the lithium battery can also be used to advantage in the design of the boat. The fact that the battery package can be arranged variably when the Torqeedo Deep Blue Saildrive is installed allows the weight of the drive system to be distributed around the centre of the vessel. This is the arrangement favoured by boat builders and boatyards.

Travelling silently even when under motor power

No sailor likes the sound of an engine when travelling in calm conditions or when casting off or landing under engine power. In contrast to conventional petrol- or diesel-powered sail drive engines, the Deep Blue 25 SD & 50 SD operate quietly, creating extremely low noise emissions. The electric sail drive operates almost in silence owing to the nature of the system. Due to the system, the electric saildrives operate almost silently.

Number 1 in power delivery

The Deep Blue Saildrive produces the equivalent of up to 80 hp of power, ideal for use in displacement boats and large sailing yachts.

Complete integration

The Saildrive drives are part ofTorqeedo’s Deep Blue series of high-performance motors. The high-tech components of the fully integrated overall system are carefully selected to match each other and are perfectly adapted for use on water. They offer professional safety features, compliance with international standards at system level and extreme ease of operation. The motors can also be used to generate electricity. The seamless integration of the saildrives into Torqeedo’s hybrid system offers the option of recovering energy while under sail through hydro power generation using the electric drive.

Low incidental costs

There are no incidental costs for petrol or diesel or for regular maintenance incurred by a combustion engine. Since the lithium batteries are manufactured to the same high standards of quality as in the automotive industry, Torqeedo offers a warranty of nine years on battery capacity, promising a residual capacity of 80 % after nine years of daily use.

All benefits at a glance

• Most powerful electric saildrive from industrial production
• Space-saving and boat construction-friendly design
• Part of a balanced, fully integrated system
• Compatible with all popular engine beds for saildrives

Electric Motor

Please note:.

The following information is in regards to our initial set up. It has been almost 5 years since we wrote this. Many upgrades and improvements have been made since then. All can bee seen on our Youtube Channel. Updated wiring diagrams, specs and photos will be coming soon. In the meantime, much of the below information is still accurate and I’m sure you will find it useful. And the answer to our most asked question is YES, we still love our electric motor!

WHY ELECTRIC?

An electric motor . . .

Is not for everyone..

Lets first take a look back in time when “production” boats became popular in the late 60s early 70s, the intent was to make an inexpensive boat the average family could afford and handle with limited sailing experience and knowledge. As a result, one of their requirements was the ability to move the boat in difficult situations. This is where the “auxiliary engine” was coined. But, for many, it has become the primary means of maneuvering their boat. Yes, there are places in the world you can’t sail, like the Panama Canal. But, there are often alternatives where you CAN sail.

“We have yet to use our motor for more than 30 minutes at a time.”

As of today, November 2016, we have sailed over 3000 miles up the east coast of the United States and through the Bahamas to Haiti. We have yet to use our motor for more than 30 minutes at a time. The majority of use comes when we drop the mainsail and back down on our anchor to set it. Most of our sailing has been offshore. But, we have also sailed on the ICW and recently sailed 25 miles up the Cape Fear River to Wilmington, NC. We have sailed under many bridges, some on set schedules, others open on demand. In all cases, we sailed under. We have found that having a solid plan and the patience to wait for the right weather and tide is the key.After all, we own a sailboat. They are inherently slow. We are not in a rush. We love the idea of being self-sufficient. But, for those who sail with schedules, are short on time, lack the patience to sit out a wind hole, feel the need to power their boat to hull speed, enjoy maintaining a diesel engine, or are just set in their ways, then an electric motor probably isn’t the right choice.

Want to learn even MORE…?

Of course we would love for you to stick around and read this page all the way to the bottom, but, we have tucked in many distractions (i.e. links) along the way. Don’t feel bad if you digress, we know you’ll be back. If you want to just jump feet first into all things “electric sailboat” Electric Seas is a good place to start. It’s a great resources community and features several other electric sailboat stories for you to enjoy.

ANOTHER POTENTIALLY GREAT RESOURCES…. 

“My Electric Boats” by: Charles Mathys. 

Although this book is currently on our Amazon wish list, we have not read it yet. But, it is the only one we could find on the subject and, for only $15, it looks promising. If you read it before we do, let us know what you think!

You don’t need a diesel . . .  

For ocean passages..

Many people have written in and commented that an electric motor is only good for day sailors who weren’t going very far each day, and that you need a reliable diesel engine for long distance cruising. But we feel like the opposite is true. Since we don’t have a dock to tie up to and charge our batteries each night, we rely on sailing to recharge our system. The longer we sail and the more sun we get, the more power we make. Because we don’t have a 9-5 to return to at the end of a fun weekend out on the boat, we have no schedules requiring that we make it back to the dock on time, no matter what the wind is doing. So, we feel that an electric motor, depending on your sailing style, can be adapted to any boat. But, you have to be willing to work around the one major draw back, range.

“We have no schedules requiring that we make it back to the dock on time.”

Range is the one major downside to an electric motor. But, with a sailboat, and some adequate sailing skills, we have found we really don’t need a motor as much as we originally thought. For those who do have schedules, the possibility of a hybrid system may work well. It encompasses all the benefits of an electric system with the added back up of a diesel or gas genset rated to supply adequate power for extended motoring. Some companies even offer an electric motor, like this one, that can be installed in parallel to an existing diesel motor. So the majority of motoring is done with the traditional diesel, however for short periods of time, like moving around the marina, the electric drive can be used instead. This also incorporates the added benefit of capturing power from the spinning prop while sailing, often referred to as “regeneration” or “regen”.

Our conversion to electric . . .  

Started with our motor..

We found the motor on ebay.com, knew it worked and that was about it. We chose this specific motor for three reasons:

• It was rated at 4.8kW at 36v which was adequate for our needs.
• It was overbuilt for an industrial application. This meant it had robust parts and easy to source replacement brushes.
• The motor cost us $125! Since this entire “Electro-Beke” project is just one big experiment, we tried at every corner to keep our expenses minimal.

Our motor weighs 110 pounds, which is quite a bit more than its brushless DC siblings like those used in the existing electric boat market. Although it is probably a little less efficient, its components are much more robust and durable. It is heavy duty, low cost and provides adequate power, with the added bonus of being simple and easy to find parts for. The only parts we will likely ever have to replace are the 8 carbon brushes that transfer electricity to the motor armature (the part that spins on the inside). Depending on use, they can last for many years without wearing out, and for about $80 we can buy a complete replacement set to have onboard. That’s it, virtually maintenance free, with only 1 moving part, the motor itself is relatively simple. On our boat, simplicity is often the defining factor for equipment selection.

This motor happens to be wired with separately excited field and armature (or SEPEX). It just means that we have a lot more control over the motors power output. We can tune it down to have more low end torque, or up to gain high end speed. This will allow us to customize the power output we need for our specific boat. A few other types of motors out there include, Series , and Permanent Magnet that only have one set of coils. Each type has its own benefits and drawbacks. But we won’t get into any of that here. If you would like to know even more about DC motors, click HERE .

we didn’t buy new . . .

Because we received quotes from three different companies:.

• Here’s our quote from OceanVolt for their AX8 motor.
• Here’s our quote from Annapolis Hybrid Marine for a Thoosa 7000HT motor. Read their prediction for power consumption and battery drain.
• Click here to see some data and predictions from Electric Yacht for their Quite Torque 20 motor.

Our entire set up . . .

Cost us just $1,400..

As you can see by the above quotes, The motors and supplementary wiring are all in the $10,000 price range. That doesn’t include a battery bank. Our motor and wiring cost us just under $500. Many of our components were refurbished, used or salvaged from boats being demolished, including some of the wiring. The battery bank and additional tools, like wire crimpers and cutters were another $500. So, for about $1000, we installed our Electro-Beke system. Our charging system ended up costing us only $400 thanks to a few amazing companies who joined our Uma Angels Family and supplied the major components. Find out more about our charging system in the “Charging” section below.

That Breaks down to:

$500 _ for the motor, controller and supplementary wiring. $500 _ for the batteries. $400 _ for the solar charger, panels and bimini modifications.

Power required . . .

To push our boat and yours..

Our motor has an 8hp rating. For those accustomed to gas or diesel engines, this may not seem like much power. But, the rating systems used for gas engines and electric motors are so different that comparing the numbers is almost meaningless. It comes down to the way the two types of motors use their energy and torque curves, which is quite different. According to the research we have done, a 1 hp gas (or diesel) engine can push 500 pounds of displacement to hull speed in calm conditions. Now, the sources disagree a little here, but as a rule of thumb a 1hp electric motor can push about 3 to 3.5 times more displacement than its petrol equivalent. So a 1hp electric motor, drawing 750W, can push about 1500 pounds of displacement.

“Hull speed’ and ‘redundant power’ weren’t something we worried about in our system.”

Our boat displaces 13,500 pounds. so, 13,500 / 1500 = 9hp electric motor., now 1hp (of electric) draws about 750 watts. so, 9hp x 750w = 6.75kw electric motor..

At 48V, our motor should give us 6.3kW, which is slightly less than what we would need to push our boat to hull speed in calm conditions. But that is something we never intend to do. It takes a lot of power to push a displacement boat to hull speed. So the slower you go, the greater your range will be. However, it takes a long time to cover that distance. So, there is a sweet spot right around 4 kts (see graph to the right) where you make good headway, while being conservative with your power consumption. Of course, these are merely suggestions. Real world conditions are rarely perfect and adding 30% redundancy is often recommended by many motor companies. 

We only use our motor for close quarter maneuvering where sailing isn’t an option, like a marina, or tight anchorage, so “hull speed” and “redundant power” weren’t something we worried about when designing our system. We often sail on and off the hook and choose places to anchor with few boats around. 

Power | Speed | Range

Hover over any point to see exact data. For example, it is estimated that at 2.7 kts our motor will draw 600 watts (blue), giving us a range of 65 nautical miles (grey). This graph is based on a 14kW Lithium battery bank and a high end motor/controller combo.

Here are some great companies . . .

That install, sell, or can help answer your questions..

Thunderstruck-EV  and EV-West  are staffed by great people who would love to hear from you and help answer any questions you may have. They both offer DIY kits that will suit the needs of any boat. They can also help source adequate battery banks, help with solar and even find local experts to assist with installations as well. 

If you’re looking for a more “plug and play” set up, check out the companies below. They represent the best in the industry and will gladly customize a set up for your specific needs and provide a detailed quote.

Elco Motors

elcomotoryachts.com

[email protected]

1 (877) 411-3526

Oceanvolt SEA

oceanvolt.com

[email protected]

+358 10 325 5281

clean-e-marine.com

[email protected]

+1 (410) 353-4348

Electric Yacht

electricyachtsocal.com

[email protected]

1 (855) 339-2248

Electroprop

electroprop.com

[email protected]

+1 (805) 455-8444

WANT TO LEARN EVEN MORE…?

Here is another great article about “How much electric power do you really need? !!! !!!

INSTALLATION

Getting down to the Nuts and Bolts

For the complete parts list and wiring diagram, scroll down..

There is a lot to talk about here. Hopefully you can follow along and not fall asleep. Like…I …….am…….right….nowwwww(yawn)www…  SLAP !!! Ok! I’m awake. Where was I. Right, wiring.

With no degrees or formal training in electrical engineering (and no, they didn’t teach us this stuff in architecture school), we had a lot of learning to do. Here we were, with a big heavy electric motor we knew nothing about, a boat it could theoretically push and the dream it would all work in the end. Now all we had to do was figure out how to get the motor to spin the prop. Sounded simple enough…right?

“…all we had to do was figure out how to get the motor to spin the prop.”

This step, of course took the longest. Since all our components were used, refurbished or salvaged, we had to test everything. We then started wiring the system in pieces in the salon and testing those. We then modified, adjusted, replaced and fabricated new systems and tested those. In all, it took us 9 months from motor purchase, to moving boat. Granted, not all of that time was devoted to installing the motor. We did have a few other projects on the side.

There are four main sections to our electric motor installation:

• The motor controller
• The batteries
• The wires that connect it all together

The motor we talked about previously. In all honesty, the main concern when sourcing a motor, is that it has enough power (watts) to push your boat to the speed you would like. The second concern is that it will work with the voltage of the components you choose. 12/24/36/48/72/96V are all common. The general rule, is that the higher the voltage, the fewer amps need to be pushed through the system to attain the same wattage. With this in mind, we have found that 72/96V systems tend to be more expensive than similar 48V set ups and, pushing a boat requires much less power that pushing a car. So, we’re not worried about running hundreds of amps through the system. Although rated at 36V, we run our motor at 48V so we can utilize available golf cart components for the rest of our systems, which are also inexpensive and abundantly available. For our boat, we designed the system to handle 150 amps. This would give us a theoretical output of just over 7kW (48V x 150A = 7.2 kW). If you were paying attention earlier, you might notice that our motor is rated for only 4.8kW at 36V. That is a continuous rating however. It can handle more, but cannot sustain it for long periods of time without some external cooling system. But, because there are times when we need all the power we can get, like stopping or backing down on the anchor, we decided to run our system with a higher amperage rating to accommodate that need.

CHECK OUT THESE PHOTOS OF OUR FINAL INSTALLATION.

(As usual, click to enlarge)

The Motor Controller

This little box is the heart of an electrical conversion. Similar to the head of an ICE (internal combustion engine), it controls the speed at which the electric motor spins. It does this by breaking up the power stream coming in from the batteries into tiny little pulses. This is called Pulse Width Modulation or PWM. There are many different types of controllers out there. In general, if you found a motor with standard voltage range, there is a controller on the market that will work for it. Some are more complex than others. Some offer built in regen capabilities, while other require computer programing and digital displays. 

Our controller is a Curtis 1209B. It is designed to run a series motor, but since we got it for such a good deal, we made it work with ours by only using it to power the armature. See the wiring diagram below for more details. This controller is not fancy. It is weather proof, simple and robust. If you haven’t figured it out by now, we love simple and robust. 

The Batteries

We will explain more below in the “BATTERIES” section. But for now, as long as you can create a battery bank that can be wired to produce the required voltage for the rest of your system, then you’ll be fine. Also keep in mind how much space and weight the bank will require. Ours fit perfectly where our old fuel tank used to be and helped offset all the weight we lost by removing the tank and the old diesel motor. For typical lead acid banks,  at 36V you will need 3 -12v or 6-6V batteries. A 48V bank will require 4 or 8 respectively and so on. Although you can purchase massive deep cycle batteries with equally large aH ratings, we don’t see the value of them since it is very difficult to maneuver them into tight spaces on a boat. Ideally, if you can afford them, a lithium bank would be the best for an electric motor conversion. We’ll talk more about them in the “WHAT”S NEXT” section below. 

All our wires our tinned copper or “Marine Grade”, although, we despise that term since it often just means “more expensive.” The majority of which, we scrapped off of boats that were being demolished at the boatyard. What we couldn’t find for free, we purchased from a local discount marine store that sold surplus marine components. This allowed us to spend very little for all the wiring. 

For the most part it is all oversized, but when it comes to wire, the bigger the better. There are many useful online calculators that can help give an idea of what size wire will be appropriate for a given application. If your wiring is undersized, the system will lose some efficiency. For the most part this is of no concern. However, in extreme circumstances it will heat the wire to the point of melting things. For example, we undersized the cables connecting the motor controller to the armature, after a 15min full power test at the dock, we melted off the heat shrink tubing on the terminal lugs. It was quickly replaced by something much more beefy and hasn’t been a problem since. 

O yeah, One More Thing . . .

The motor mount. .

Oops, almost forgot. Somehow we had to keep the motor inline with the transmission and securely mounted to the boat.  We built and re-built 6 different mounting brackets prior to the one we have now. Each being fabricated after hours of sketches and models were developed. We didn’t have to modify the motor any or the transmission itself. However, we did modify the original transmission adapter plate that was used to attach it to the back of our Westerbeke.  We then securely attached the transmission to the hull of our boat. This allowed the motor to float in front of it, leaving the transmission to absorb any thrust from the prop. 

We fabricated the brackets out of steal since it is easy to work with and weld. Once we settled on a final design, we epoxied and painted the brackets and motor with engine enamel. We’re quite pleased with the final outcome. All the exposed metal is protected from corrosion and it is very securely mounted to the old engine pan.

In tandem to our bracket iterations, were several attempts to connect the motor to the transmission. Our early versions were poorly aligned causing horrible vibrations that in turn produced noise. Noise was something we were trying to avoid by going electric. The final design paired two identical sprockets, connected inline by a #50 double roller chain. This seems to work quite well. It allows for small misalignments and produces the least amount of noise. There are of course many other options out there, and someday we may experiment with them. But, for now, this set up works for us. 

Take a look through our Electro-Beke playlist on Youtube  for video of the installation process. 

WIRING DIAGRAM

Including complete parts list..

Here it is. The schematic you’ve all been requesting. You may notice that it is drawn for a direct drive system, where the motor is used to electronically shift from forward to reverse. We have since installed our motor in front of our old transmission and no longer need the Fwd/Rev circuit. However, since the majority of set ups out there use the motor to achieve Fwd/Rev, we wanted to show our diagram depicting a similar set up. If you end up with a Series or PM motor, you should be able to modify this diagram by excluding the 12V bank to motor connections. However, many of the components, like the contactors, require a 12V supply to operate their solenoids. So you will still need a 12V accessory bank. This is often the house bank of a boat, since many smaller boats run 12V house banks anyway.

Below are the components we used, why we chose them, where to buy them and pictures of them installed in our boat. If you didn’t figure it out already, their letters correspond to the diagram above.

(A) – 10A FUSE 

Buy one HERE .

This is a simple automotive fuse held in an inline fuse holder. It protects the ignition circuit wiring from drawing too much amperage in the event of a short.

(B) – Key Switch

Buy one here . .

The key switch is mainly for security. It can be replaced by a simple on/off switch, but taking the key out will slow down someone trying to leave with your boat, without your permission.

(C) – FWD/REV Switch

This switch is only needed if you are planning a direct drive system. We no longer have need for it, but also have yet to rewire our system after we installed the transmission. It is a basic rocker switch with an on/off/on rocker and 6 pins on the back. This allows both positive and negative wires to be switched. We also wired ours so that it will shut off the contactors if switched accidentally while the throttle was engaged. That way it wouldn’t cause any damage to the motor.

(D) – Throttle

The throttle tells the motor controller how much power to send the motor. We chose this one because it allowed us to keep our existing throttle lever and cable mounted on the steering pedestal. It also has a micro switch that we use to close the secondary contactor (N) on the 48V side and the Fwd/Rev contactor (E) on the 12V side when the throttle is pushed forward. This ensures no voltage is going through the system until the throttle is actually engaged.

(E) – FWD/REV Contactor

This, again, is not needed if you, like us, install the motor with a transmission that handles Fwd/Rev. However, if you are planning a direct drive set up, and the controller you chose doesn’t have a Fwd/Rev circuit, then this is a necessary evil. The one we used, we scrapped off an dead windlass. It works great for the 12V circuit and are easy to find.

(F) – Main Battery Switch

Our boat came with this switch installed already. We simply rewired it slightly to accommodate our systems. For now we only use the “Battery 1” and “off” settings. However, if we eventually install a DC-DC converter to bring our 48V bank down to 12V we could wire it to the “battery 2” position as a back up battery bank.

(G) – Positive Buss Bar

Pretty basic here. A buss bar is used to connect multiple leads to the same source. This one is beefy to handle high amperage on the positive side of the 12V circuit.

(H) – Negative Buss Bar

Same as the Positive buss bar above. However this one is tied into the 48V circuit. 

(J & M) – Shunt

These are pretty standard. They are required to hook up an amp meter and measure how much amperage is running through your system. Often an amp meter will come with its own shunt. They sample the current so that not all 100+ amps are running through a meter. That would be very dangerous. Just make sure the shunt and meter are rated for the same mV, usually 50mV or 100mV.

(K & U) – Main Fuse

These fuses protect the wiring in the system. The closer to the battery bank the better. The fuse on the 48V side is rated for 200A and the 12V fuse is rated for 80A. These are rated for amperage only and can usually take a variety of voltages. Both fuses and holders are identical. They just have different ratings.

(L) – Primary Contactor 

This contactor is wired to the main key switch. It is a bit redundant but shuts off any power from the controller, motor and gauges. It acts more like a battery shut off.

(N) – Secondary Contactor

This contactor supplies the motor controller with the power it needs to run the motor. It is also the one that is bypassed by (T) the pre-charge resistor. Contactors are just big remote activated switches. Like breakers, they activate very fast to eliminate high amperage arching.

(P) – Motor Controller 

The motor controller we chose works for our application, but there are many out there to choose from. Do your own research here before deciding on what motor you will use. We happened to get a sweet deal on ours so we made it work with our motor. Our system would be less complicated if we used a controller designed for a SEPEX motor. The Curtis 1209B that we have is designed for a Series motor, but we make it work.

(Q) – DC Motor (SEPEX)

Sorry, you’ll have to find this one on your own.

Since another motor like ours has yet to show up again for sale online, we can’t really recommend the same one. However, the basic idea is finding a motor with the appropriate wattage to push your boat. Refer to our “Power Requirements” section to get an idea of what that might be. Then just make sure it will produce the desired power at a voltage that you would like to work with. We recommend 48V for most applications for reasons described previously.

(R) –  Amp Meter

These attach to the shunt (J & M) and show you how many amps are running through the system. Depending on where it is placed it can either read the amps being drawn from the battery bank or the amps going to the motor. We decided to read the amps being drawn from our batteries.

(S) – Volt Meter

This meter does not require a shunt. As long as the negative lead makes its way back to the negative buss bar, the positive lead can be attached at any point along the circuit. We chose again to read the battery bank voltage with ours. However, it can also be place on the motor to read the voltage there instead.

(T) – Pre-charge Resistor 

They look like THIS . 

There is no specific item to show you here. Each controller and each set up is different. But, I can tell you that the pre-charge resistor is very important. It by-passes the main contactors and supplies the motor controller with the power it needs to pre-charge, so its ready when the main contactor is switched on and all that amperage comes rushing in.

Make sure you check out SV Bianka’s page for another detailed blog about his electric motor installation.For another great article about all the other stuff that goes into a motor installation,

you might want to read “Balance of System” . The article is for an electric motorcycle set up, but the basics are similar enough.

One thing we learned very early on was that . . .

Volts (v) x amps (a) = watts (w) or v x a = w.

At first we thought (please don’t laugh we were total newbies)  that if we took 4 – 12V batteries with 125aH, and wired them in series, we would get a 48V bank with 500aH capacity. Obviously we forgot everything we learned in high school algebra. We soon resolved our mistake and learned that this formula is at the heart of everything electrical. As you can see, Watts are the thing you need to pay attention to. Remember high school physics? W=Work. Many appliances in your house, often things that produce heat, are rated in Watts, but marine stuff tends to rate things in Amps. Well, for our sake Watts are king. No matter what boat you have, it requires a certain amount of work (Watts) to push it through the water at any given speed. So, your job is to charge, store and supply to the motor a similar amount of wattage in order for your boat to move. The more watts you can store, the longer you can push your boat.

“The more watts you can store, the longer you can push your boat.”

As mentioned before, our motor is a SEPEX motor. This meant that the field and armature needed 2 separate voltages in order for the motor to spin. The way we solved this problem was with two separate battery banks. The field is powered by the house bank at 12V. This bank consists of two deep cycle batteries wired in parallel giving us about 250Ah at 12V. So far, it has held up great. It powers everything onboard including the inverter and laptops. We use about 30Ah on a slow day at anchor, and around 70Ah when sailing or when we’re both using our laptops all day at anchor. The nice part, is that even on a cloudy day, our 480W solar bank can replenish that before dinnertime. But we’ll talk more about that in the next section, “CHARGING” below. 

The motor bank consists of 4 – 12V deep cycle batteries wired in series giving us about 125Ah @ 48V. This may not seem like much, but in the last month of sailing, we have logged over 1000 miles, including sailing 25 miles up the Cape Fear River, and have never depleted the motor bank more than 35%. That works out to drawing only 44Ah used. We’ll talk more about range and testing below in the “TESTING” section. 

There are many types of lead acid batteries on the market. Don’t get too invested in brand. Most of the batteries on the market today are made by the same two companies. Trojan seems to be the brand of choice for many. We found batteries for sale locally and for $100 each, including delivery, we couldn’t pass them up. We also knew that the flooded lead acid bank we installed is only temporary. Like we’ve said before, this whole “Electro-Beke” thing is really one big experiment. We have plans to install a LiFePO4 bank soon enough. But we’ll tell you all about that in the “WHAT’S NEXT” section below.

There are many inefficiencies in electrical systems, like heat. However, don’t worry about them too much. If you budget 30% power redundancy into your system, it will more than cover any losses from heat, or mechanical friction and so on.

Check out www.batterystuff.com . They have useful calculators for battery banks and solar, along with great information on different types of batteries and what they are used for.

Our Solar System . . .

Also doesn’t include pluto..

We have 480 watts of solar. Broken down into 2 – 240W panels at 24v wired in series to give us a nominal voltage of 48V. Did you get all that? Great! Steven, from Solar EV Systems , gave us a great deal on them, landing him a spot in our Uma Angels Family . There are a several types of solar panels, but as far as we can tell, any modern panel is efficient and well made. None are much more efficient that others, it’s more about the size of your mounting space, and the size of your wallet. The ones we have are made by Trina, They are not expensive, look well made and perform exactly as promised.PV (Photovoltaic, aka solar panel) modules have three different voltage ratings that are handy to understand:

• The nominal voltage of a panel could also be called the “conversational voltage.” When we talk about the voltage of the panels and the other components of the system, we’ll most often use the nominal voltage. Nominal voltage actually refers to the voltage of the battery that the module is best suited to charge; the term is a “leftover” from the days when solar panels were used only to charge batteries. The actual voltage output of the panel changes as lighting and temperature conditions change, so there’s never one specific voltage at which the panel operates. Nominal voltage allows us, at a glance, to make sure the panel is compatible with a given system without having to look at the exact voltage. Our panels have a nominal voltage of 24V. We wired them in series which gives us 48V. It reality, they put out about 75V on a sunny day. But our charge controller allows us to charge a battery bank from 48V all the way down to 12V with the same solar panel set up. We’ll talk more about our charge controller later.
• The second voltage rating is the maximum power voltage (Vmp). This is the highest voltage the panel can produce while connected to a system and operating at peak efficiency. As mentioned above, the max our panels will produce is around 75V, even though we talk about them as a 48V panel system.
• The third voltage is open circuit voltage (Voc). This is the maximum voltage that the panel can produce when not connected to an electrical circuit or system. Voc can be measured with a meter directly contacting the panel’s terminals or the ends of its built-in cables.

Panels also have two different current ratings: current at maximum power (Imp) and short circuit current (Isc), both listed in Amps. The maximum power current is similar to Vmp: it’s the maximum current available when the panel is operating at peak efficiency in a circuit. Ours can produce 35Amps at max efficiency, They consistently produce 30A on a sunny day and we’ve seen as much as 32A. Similar to Voc, the short circuit current is the current measurement your meter would show when in contact with the positive and negative terminals of the panel while not connected to a system or load.All these voltage ratings and current ratings are often found on the back of a panel. Use them to estimate how much power they will be able to produce.

Two rules of thumb:

• 1kW or solar will produce 4kWh/day
• Rated Watts / 3 will get you approximate Ah/d @ 12V.

So, according to this, our 480W panels should give us 160aH on an average day, which we’ve found to be quit accurate. Although, we’ve only ever needed more that 100Ah of charge on one occasion. So usually, our batteries are charged back up before lunch, and we spend the rest of the day on “float” charge.

Types of Panels

Monocrystalline.

These are single silicon cells grown into larger crystals, then cross-section cut into small wafers to form individual cells that are later joined together to form a solar panel. This cell type has high conversion efficiency which means it takes up less space on deck. These cells are generally not shadow protected and are often more expensive per watt.

Multicrystalline (Polycrystalline)

These cells are also single silicon cells constructed by utilizing multiple amounts of smaller crystals to form a cell. This cell type has very high conversion efficiency but is also not shadow protected. Although, you should really be installing any panel so it doesn’t get blocked by shadows throughout the day. It will drastically increase the output if you install them in a proper location.

Amorphous silicon

These are the most inexpensive to manufacture. They are produced by depositing an active silicon material on various substrates like stainless steel sheet. The conversion efficiency is not as good as the single crystal type, but Uni-Solar panels are this type of panel and are shadow protected. Shadow protected means that a panel continues to charge when part of the cells are in a shadow, like a stay, which is a great advantage on a sailboat.

Our Charge Controller . . .

Is at the heart of it all..

The next, and possibly most important component in our charging circuit, is our Midnite Solar KID charge controller. This thing is amazing. Midnite also joined our Uma Angels Family when we asked them to send us a controller and they agreed. We spent a lot of time researching solar charge controllers and learning all about PWM vs MPPT. Bottom line is, if you can afford it, get the MPPT controller. We chose the Kid because it’s just the most efficient at collecting power from your panels. It is also easy to program and understand. We currently run it at 12V and just rewire our motor bank to 12V when we need to charge it. However, we will soon be adding a smaller, simple 12V charger to the “load” circuit of the Kid. This will allow the Kid to be permanently charging the 48V house bank. But, when it is full, switch over to the “load” circuit and charge our house bank through the smaller controller. It may all sound too complicated now, but once it’s installed and working, we’ll be sure to share everything with you in more detail. 

“We have never gone 24hrs without fully charged batteries.”

On a boat, where space is at a premium, you need all the efficiency you can get. Right now, I’m sitting on the boat, it is overcast and raining outside, it’s noon and we’re getting around 100W of power in from our panels (about 8-9A @ 12V). Our house bank will be charged back up by dinnertime, same as the last few days, and we haven’t seen the sun all week. When it is sunny, our house bank is usually charged back up before we wake up in the morning. No we don’t wake up THAT early, usually around 10am, but seriously, if it’s sunny in the morning, we put 30+aH into our batteries before 10am. The charge controller runs silently, however it makes a tiny click when it switches from “resting” to “BulkMPPT”. Since on a boat, we’re attuned to every tiny sound, we usually here it click on and off a few times before the sun even rises. Mind you, it’s only putting in 0.5aH then, but still, the sun isn’t even over the horizon yet and we’re already charging our batteries. 

Check out “Step 26” when we install our solar panels and charge controller. 

The rule of thumb we used when designing our system is that 1 – 100W panel can charge a single deep cycle battery from 50% discharged in a single sunny day. So we have 6 batteries, so ideally we would have 600W of solar. Now, that just wasn’t practical for us, so we settled for 480W and it keeps up just fine. However, if we discharged our motor and house bank down 80% we would need about two sunny days to get them both topped back up fully. Or, about 4 rainy days. For us, this isn’t an issue since we typically use the motor for very short periods of time right before anchoring or when setting off for a multi day passage. So, by the time we need them again, their both fully charged and ready to go. If not, we’ll just hang out and drink a beer. So far it’s never been an issue or even come close to it. We have never gone 24hrs without fully charged batteries.

Many have suggested we have a small generator on board as a back up, just incase there is no sun for many days and our batteries are dead. So far, we have gone a full week without sun and our solar has kept up just fine. Although, we may design a system with the ability to be hooked up to a genset for extending motoring, like say the Panama Canal, so that if we ever needed to, we could just set a generator on deck for a few days and then get rid of it as soon as we’re done. But, for now the whole point was to get away from petrol dependance. 

So far, solar is our only means of power production. We do have plans to get working regeneration from the prop while sailing. The possibility is definitely there, and we have tested for voltage while sailing. But as of today, we haven’t hooked up a charge controller to it. Mainly because we just don’t need it…yet. Our power requirements are so minimal and we use the motor so little, that we haven’t bothered to hook it up yet. But, it is on our short to-do list. So stay tuned for future updates. 

HERE is a link to a great forum talking about solar systems, battery banks and how to balance them. 

How far can you motor? 

Maybe the most asked question we receive..

It’s a valid question for sure, and one that many have asked us. But, we have yet to find out. We are still early on in our testing phase of the experiment. We’ve used the motor many times but rarely for more than 10-15 min and never more than 30. It is also hard to find “ideal conditions” to test in. There either isn’t enough space, time or light. Or the tide and wind aren’t in our favor. Sounds like excuses we know, but it’s the truth. 

“We are in no hurry to go anywhere,  ever.” 

From what we have done, we can tell you this. Our max speed has been right at 4kts. but it was against a slight current, maybe 1kt max. So, that would mean our theoretical top speed is closer to 5kts. 

Here again, we haven’t actually found out. Mostly because without a tow boat right beside us, it would be dangerous to run out of power in the middle of a channel or bay where there are “calm conditions”. But, we’ve motored for 2 nautical miles at 3kts (with a 1kt tide in our favor) and it drained our batteries down to 70%. So, that would mean that in “ideal conditions” we could motor at 2kts for 6 nautical miles. Doesn’t sound like much, we know. But, with a favorable tide and even a slight favorable wind, we can extend that tremendously. We also wait for the wind and tide to be favorable and then just sail to where ever we need to go.

With limited area to mount solar panels and without a genset, we knew if we used more power that we could generate, we would always have dead batteries. So, from the beginning, we focused more on how much power we could consistently generate, and base our system off of that. To us, the meant using less, not necessarily making more. Our solar has kept up great so far, but our power needs have also been minimal. We have autopilot and a chart plotter that are always on when sailing. We also use our laptops constantly and run a small inverter for tools and small cooking appliances like blenders. We have all LED lights too. We don’t have a refrigerator yet or windlass. But they are on the short list. We also have yet to capture any power from the prop while sailing. So there is still room to capture more power if we need it. 

As we continue to sail further and upgrade and modify our system, we will also continue to update you on how it all works here. So keep a look out for updates on our Facebook page and in future videos.  

WHAT’S NEXT

We may have a spinning Motor . . .

But the fun has just begun..

Well, our motor works. It pushes our boat reliably. The Electro-Beke experiment is a success, at least in our eyes. Now the real fun begins. We’ve proven to ourselves that we can sail further that we thought and use the motor less than we originally planned. So, what’s next?

“We have a few more project on the list of upgrades and modifications.”

We have a few more projects on the list of upgrades and modifications. The first thing on the list is to rewire our system and remove the redundant components left over from the direct drive phase. After that, installing some better gauges and monitoring systems would be really nice. There is a “fuel gauge ” we would like to install for the motor bank and house bank. It is simple and relatively smart. It will give us an accurate state of charge in a quick glance. 

Next on the list will be installing a charge controller or developing a similar system to allow us to capture power from the spinning prop while under sail. Technically our motor is capable of it, and early tests have augmented this theory. We are currently working with a few companies to figure out what the best system will be. 

We also need to install a larger heat sink for our motor controller. The one that came with it is designed for air movement across its fins and is therefore undersized for our needs. However, we may be upgrading to a true SEPEX motor controller before long, so it will handle regeneration and would require a different heat sink anyway. 

The big ticket item on the list is to install a large LiFePO4 battery bank. We have our eyes out for a salvaged Nissan Leaf or Chevy Volt that still has its battery bank intact. We’ve seen them for sale before and would love to get our hands on one. LiFePO4s are much more stable than other types of Lithium Ion batteries. But, we’ll talk about that if and when we actually get our hands on some.