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18KW Liquid Cooled Sailboat Kit 72v

[Contact us for a price]


Base price is $2442 plus optional accessories

***This system can also be set up for use at 48v yielding a 12kw output.***

Eliminate noxious diesel fumes and the frustration of filling up at the pump with the 18KW Brushless Kit featuring a Motenergy brushless motor and a 72V 550 Amp Sevcon Gen-4 Controller. Enjoy your sailboat to the fullest, with a silent drive and truly fresh air.

Customers have used this in boats with 25K pound displacement. The system is liquid cooled so provide your own 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 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.

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. The ME1616 will spin around 2700rpm at 72v under load.

What about Batteries? Most customers are happy with sealed, deep cycle lead acid, sourced locally to save on shipping. Use 6 in series to get 72v and 100 amp hour capacity minimum.   

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 ME1616 Liquid-Cooled Brushless Motor. Provide your own cooling circuit or use ours. 
  • Controller: 72V Sevcon Gen4 550Amp with regen. 
  • ET-134 or ET-126 (spring return) Directional Throttle
  • Tyco High-Quality Sealed Contactor
  • Key Switch
  • 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 Sailboat Kit Installation Instructions

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

E-Boat Modeling Spreadsheet Manual (.doc)

Vicprop Calculator