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10HP Brushless Sailboat Kit



Convert your 12-29 HP diesel engine to clean, quiet electric. Eliminate noxious diesel fumes and the frustration of filling up at the pump with the 10KW Brushless Kit featuring a Motenergy brushless motor and a 48V 450 Amp Sevcon Gen-4 Controller that can produce up to 10HP continuous, often used to replace <30hp combustion engines!  Enjoy your sailboat to the fullest, with a silent drive and truly fresh air.

This system is recommended 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.

With Sevcon's Gen4 controller, no reversing contactors are needed. Additionally, the Gen-4 controller has a regen feature than can allow current to be put back into the batteries from the spinning prop while under sail. This does depend 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 utilize it.

A Gear Reduction is not always necessary, and largely depends on the size, efficiency, prop style, and desired speed of your vessel. However, due to the high RPM of the Motenergy Brushless motor, we recommend you consider a gear reduction rather than direct-drive to improve efficiency, provide proper torque, cooling, and help prevent cavitation. Typical reduction is around 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. This number can be calculated using the 50 RPM / Volt constant:

48 Volts * 50 RPM / Volt ~ 2400 rpm max

What about Batteries? Most customers are happy with sealed, deep cycle lead acid, sourced locally to save on shipping. Use 4 in series to get 48v and 100 amp hour capacity minimum. Larger capacity will give a longer run time.

If you choose not to use a gear reduction, it's important to install a thrust bearing somewhere in line with the prop shaft, as most motors are not rated for axial/thrust loads on the shaft. Also note that a heatsink for the Sevcon controller is recommended by the manufacturer.

Kit includes:

  • Motenergy ME1115 Dual-Stator Brushless Motor
  • Controller: 48V Sevcon Gen-4
  • Throttle (additional cost)- your choice of: 
    • ET-134 directional throttle. For harsh environments we recommend the ET-134 as the most robust option. Use the ET Actuator to connect to your existing throttle cable. ET-134 has a Neutral Detent, ET-126 is Spring Return. 
    • Wigwag throttle lever if Not reusing your existing lever
    • PB-8 throttle and Fwd/Rev Switch
  • Tyco High-Quality Sealed Contactor
  • Key Switch
  • Fuses
  • 200a Breaker
  • Every kit is individually bench tested
  • Complete wire harness with 10ft key and throttle cable lengths
  • Wiring instructions

Helpful links:

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.

Gen4 10KW Sailboat Kit Wiring Diagram - for Fw/Rev Switch Option

Gen4 10KW Sailboat Kit Wiring Diagram - for Curtis ET throttles

Gen4 10KW Sailboat Kit Wiring Diagram - for Wigwag Throttle

Gen4 Sailboat Kit Installation Instructions

Gen4 fault codes

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

E-Boat Modeling Spreadsheet Manual (.doc)

Vicprop Calculator

Using our charger w/ Solar


I think the system is great! So quiet, and not having to start an engine, just instantly turn the motor on when needed is awesome! [Catalina 30]
Excellent kit! I repowered my 1976 Endeavour 32 (max displacement 11000lbs) with a 10Kw sailboat kit and couldn't be happier. The original diesel was a Yanmar YSE, 12HP, that would barely push us at 4.5kts. Yesterday, first day in the water, we motored at 3.3kts/1400RPM/12Amps, 5.2kts/2048RPM/40Amps. I have 4, 8D AGM batteries for a total of 350Ah, even at 50% depletion I can motor for just over 4 hrs@5kts, we had about 50% amps while motorsailing. Gen 4 controller with the sevcon flat screen shows all the important data. No smell, no noise, no vibrations! Installation was just as fast as advertized! Great customer service, always available to answer questions! Thanks!
Just brought the boat over to it's mooring in a 12 knot wind. FANTASTIC!!!
Thanks for all your help.
Loved the system last summer. Almost instant on, without having to warm up an engine, and much more reliable than the old Atomic 4 ICE.
The system was a dream to use compared to the clunky old diesel. I’m very happy with the new electric drive.
Had it in my boat for two seasons now without a glitch.
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