The Electric Propeller Company builds a wide range of marine propulsion drives and energy systems.

Drives include controller, contactor, and complete wiring harness and are shipped in running condition.

Systems includes the drive motor, gearbox, motor mounts, mounting system, cooling system, batteries, battery management system, battery chargers, AC distribution, DC distribution, shore-power and propeller (except Racer).

Plus Systems include enhanced battery management and ground fault monitoring.

All systems can be customized per your requirements.



Electroprop Helical Drive systems are first in class for efficiency.   Helical Systems are recommended for conversions replacing diesels under 30 h.p.

The Mariner is a modular, open frame, low profile system for powering boats up to 10,000 lbs.    Mariners are compact and powerful machines that we have built for over 10 years.   The Mariner has a permanent magnet AC motor with helical gearbox.  We recommend the Mariner for sailing vessels up to 10,000 lbs.

The Sailor is built on the foundation of The Mariner.   The Sailor has a fan pulling air out from near the motor, and ducting for bringing cool air into the drive unit.  The Sailor has a permanent magnet AC motor with helical gearbox.   The Sailor is recommended for vessels up to 12,000 lbs.

The Islander  has two fans, one blowing cool air into the enclosure, and one expelling warm air out of the enclosure.  The controller, contactor and wiring harness are installed in a plug and play package.  The Islander has a permanent magnet AC motor coupled to a helical gearbox.   The Islander is recommended for sailing vessels up to 14,000 lbs.



Planetary Drive systems are smaller, lighter and more powerful and fit better into larger vessels or new sailboats.    Planetary drive systems have 3 different gear ratios:  3, 4 and 5:1.   Planetary drive systems are capable of running up to 6,000 rpm.   Electroprop Planetary Drive systems run at up to 4,500 rpm.   All Planetary Drive systems have wiring harness components mounted inside the DC distribution box.

The Racer is a very lightweight system for racers, and very compact system for boats with minimal space.   Racer drives can be used to replace a V-Drive or Hydraulic Drive.    The installer is responsible for mounting a fan or fans for providing cool air flow across the motor.  A transverse beam is required for installation of the Racer in an electric boat.   Racer Drive Systems are appropriate for vessels up to 17,000 lbs.

The Seafarer is an air cooled planetary drive system for sailboats up to 17,000 lbs.  The Seafarer casing includes two fans that both push and pull air through the drive enclosure.

The Cruiser is air and water cooled.   The Cruiser is both air and water cooled for high sustained loads found in a Cruising Sailboat.  The Cruiser utilizes permanent magnet AC motor technology with planetary gears.  The Cruiser is recommended for vessels up to 20,000 lbs.

The Voyager is both air and water cooled with planetary gears.  The Voyager is recommended for vessels up to 42,000 lbs.  Two of these drives could be utilized on a vessel larger than 42,000 lbs.


A Word of Thanks to Nigel Calder:

Over the course of my career as a Marine Electrician I have referred often to Nigel Calder’s Book  “Boat Owners Electrical and Mechanical Manual” many times.    Throughout the development of our electric propulsion products, I have read many other articles that Nigel has written, and have emailed with him over different aspects of Marine Electric and Hybrid Propulsion.    Nigel’s in-depth research on electrical and mechanical components has been very helpful.     Thanks Nigel for staying the course and reporting real information for everyone to make boats better.

Here is how Nigel sees Electric Propulsion as it has developed into what it is today:

‘The past decade has seen numerous advances in permanent magnet electric motor technology, motor controllers, gearsets, batteries and system controllers. When properly combined and integrated, these now constitute a fully-engineered and elegant propulsion solution for any boat that does not require an extended range under power.   The immediate benefits are freedom from noise, exhaust pollution and maintenance. When all the bills are in, the cost of the energy for electric propulsion is typically a fraction of the cost of fossil-fuel-generated energy.   Electric propulsion has come of age.’     Nigel Calder  –  November 28, 2015



Our Fleet of Electroprop Conversions