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Old 05-17-2012, 12:50 AM
Electric Surf Electric Surf is offline
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Default electric wakeboard boat

I’m planning to convert a wakeboard boat from gas to Electric. Plan is to take an approximately 20 foot long fiberglass wakeboard boat, rip out the approx. 3600 lbs 5.7L gas V8 and all unnecessary ice components and install a DC motor in its place.

“Wake surfing” if you haven’t seen it can be viewed at this youtube link

The boat will be purpose built for wakeboarding, wake surfing, and slow cursing eliminating most of the boats high-speed travel.

When these types of boats are being used for Wakeboarding and wake surfing the boat is required to produce a large wake. This is typically achieved by adding weight to the boat via inflatable water ballasts, lead weights, sand etc or by lowering a “foil” or “wedge plate” attached to the transom of the boat pulling the boat down giving it the same affect as weight. Since in this application weight is a good thing, Lead acid batteries are an obvious choice.

Boat propellers come in all pitches and size so once I’m done the conversion I can dial it in even closer to my desired performance with a prop change

I am a Canadian journeyman electrician and apprentice power line technician with a decent amount of experience in welding, auto mechanics, and fabricating.

Once complete the boat will live all summer in the water at a dock where a power source up to 100amps at 240V AC can be installed.

Other then getting a donor boat, stripping it out, making up an electric motor mounting bracket, coupling the motor to the propeller driveshaft, hooking up a controller, a charger, and filling it with batteries what else is there ?

The donor boats original gas engine would have produced about 300 H.P. and 370 lb-ft of torque making the boat capable of approx. 44 mph (71 kph)

I plan on only traveling at 10mph (16 kph) for wake surfing and 22mph (35 kph) for wakeboarding and rarely hitting higher speeds

Does anyone have any idea how to calculate the correct motor and size I need ?

A big 13 inch series wound DC I’m guessing?

Let me know what you guys think of my ideas and throw out some tips or advice if you have any!
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