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18-24KW Liquid Cooled Sailboat Kit

Please Enter: battery cell chemistry, amp hour rating, overall pack voltage, series cell count and arrangement.
Please provide us with the specifications of your boat such as make, model, and displacement.

Eliminate noxious diesel fumes and the cost of filling up at the pump with this electric conversion Kit. Enjoy your sailboat to the fullest, with an electric option in the 18-24kW range. Motor output is determined by the battery pack voltage: 18kW continuous for 72v, and 24kW continuous at 96v nominal.

Customers have used these kits in boats with 20-40K pound displacement. The system is liquid cooled - and can use your existing heat exchanger, or use our radiator, fan and pump - you supply the hose. Do not run saltwater through the motor

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. 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 the Curtis controller, no reversing contactors are needed. Aditionally, regen is enabled, allowing 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 use it.

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 prop RPM required 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. With the Curtis controller, the ME1616 will spin over 2500, although we program it to max out at 2500 unless otherwise specified. 

What batteries should you use? Most customers are happy with sealed, deep cycle lead acid, sourced locally to save on shipping. Use 6 in series to get 72v and 8 in series for 96v. Batteries with a minimum of 100 amp hour capacity are recommended.   

* 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.

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.

Curtis Sailboat Kit Installation Instructions

Curtis Fault Codes

Curtis Wiring Diagram with ET throttle

Curtis Wiring Diagram with Wigwag throttle

Cooling Notes Curtis

Cooling Notes Sevcon

Sevcon wiring diagram

Sevcon installation instructions

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

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

  • Motenergy ME1616 Liquid-Cooled Brushless Motor. Provide your own cooling circuit or use ours. 
  • Controller: Curtis 1238SE-7971 
  • Throttle options - additional cost (see the Throttle page for details): 
    • ET-134 directional throttle. If you plan to use an existing throttle lever 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
  • Sealed Main Contactor
  • Key Switch
  • Engage II Display (Will show voltage, rpm, current, SOC, motor and controller temp, and fault codes)
  • Every kit is individually bench tested
  • Complete wire harness with 10ft key and throttle cable lengths (custom lengths on request)
  • Wiring instructions

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