The Racer Powertrain is ideally suited for In Shore Racers.    The system is designed to be light weight, powerful, and efficient.   Propeller is owner supplied or choose from an optional feathering propeller.

Voltage:  72 Volts Standard   ( All Voltages from 36 to 96 VDC available )

Maximum Power:  18 KW at 72 volts

Continuous Power:   10 KW at 72 volts

Continuous Current:   125 amps

Motor RPM:  4,000 rpm

Reduction:   Planetary Gearbox

Cooling:  Forced Air,  Motor Fan,  Electric Fan turned on by Motor Thermistor

Propulsion Battery Bank:   7 Kilowatt Hours, 100 amp hours, 72 volts

Hybrid Charger:   720 watts or 2 KW

House Power:   24 amps x 12 volts DC to DC converter


The Racer Powertrain Includes:

Protected Smartplug Shorepower Cord cut to length (up to 50 feet available) with integral 15 milliamp protection molded into shorepower cord:   Protects against shorepower induced corrosion in Salt Water and Electric Shock Drowning in fresh water in the event shorepower cord is kicked into water while energized.



Smartplug Shorepower Inlet:   Larger contact surfaces, with O ring seals.    Better wire attachments for longer life.



Electroprop AC Distribution:  Master RCBO breaker for Ground Fault Protection for Ship side AC power.   Individual breakers for charger(s) and house AC circuits.    Waterproof for reliability and to prevent nuisance tripping of Ground Fault Breakers.   Plastic Enclosure to prevent shock hazards and rusting of components.   Built to last to the highest quality.


Charge, Monitor and Balance   

The Battery Management System has 5 main purposes


  1. 48 Volt Propulsion Battery Charger Configuration:   Up to 49 amps @ 58 volts = 2.8 KW
  2. Propulsion / House Configuration:  up to 27.5 amps at 58 volts  plus 100 amps at 14.4 volts = 2.8 KW


  1.  Monitors the batteries for over voltage and turns chargers off if any individual battery goes over a safety set point, thus preserving the life of the battery.
  2.  Monitors the Batteries for low voltage, or amp hours remaining, and turns off loads when batteries get too low, thus preserving the life of the battery.
  3.  Monitors the amp hours consumed
  4. Monitors DC Load Current, DC Charging Current and DC Battery Current.
  5. Makes Float decisions on chargers using DC Battery Current


  1.  Up to 5.4 amps of top balancing at 14.4 Volts  –  180 watt top balancer
  2. Up to 2  amps of all-voltage, continuous balancing



Electroprop DC Distribution:   Insulated, Plastic box  eliminates exposure to current carrying conductors to prevent accidental arcing from metallic tools.    E- Expert Pro Shunt for current measurement.   All cables come in through waterproof strain reliefs.   1 foot long service loop is required.

Mounting:   Mount in a waterproof area of the boat, or order Waterproof DC Distribution

Electroprop Motor Breaker:   250 amp

Electroprop Logic Breaker: 5 amp

Electroprop Cooling Fan Breaker:  5 amp

Electroprop Charger Breakers: 1 x 30 amp

Solar Fuses:   10 amp

DC converter Breaker:  10 amp

Two Fuses for Shunt Measurement

The Electroprop DC distribution panel is capable of distributing up to 18 KW of power to your boat systems.

All Breakers are Double Pole Breakers.   The combination of Ground Fault Monitoring and Double Pole Breakers gives the operator the ability to exactly diagnose the system at sea.   Most issues can therefore be resolved immediately allowing uninterrupted use of the vessel.

All Fuse Protected Circuits are protected with two fuses.

All Breakers and fuses are rated for charging voltages ( 72 volt batteries charge at 87 VDC ) and peak currents (up to 250 amps)  experienced by the system.


Electroprop Ground Fault Monitoring of Floating Battery Bank:    Electroprop tests for Insulation Resistance to ground for the entire 72 volt electrical system.  Floating (or  Isolating) the battery pack is how all electric cars are wired, and how any boat from 48 volts to 500 volts is wired.    We use this method because it is safer, easier to understand, and easier to monitor.    The propulsion battery bank is not connected to the boats grounds, underwater metals, AC green wire or 12 volt DC negative.   Keeping the Propulsion Battery Independent insures reliable operation of the vessel.

It is simply the best way of building a high energy battery bank.



6 Northstar Thin Plate, Pure Lead, Advanced 100 amp hour AGM batteries:   The Best Marine Battery ever made.  

We use Northstar Batteries exclusively in our systems because they are the best marine battery ever made.    The Northstar Battery is the most forgiving, can be discharged completely without failure, can be recharged faster than other AGM batteries, are forgiving to deep discharges, do not have to recharged immediately and can function in Partial State of Charge (PSOC)  for weeks at a time.

The Northstar battery will last longer, be more reliable and operate more efficiently than any other lead acid battery.   While operating in PSOC, the Northstar efficiency rivals that of Lithium batteries.   More charging energy is captured and stored for longer ranges.

Thanks Northstar for making such a fantastic battery for electric boats!

Each Seafarer includes two 48 volt Battery Banks in Series


DC converter for House Loads:    A simple and lightweight method of providing power for house loads.   Rated at 300 watts peak power for each converter.   Up to 3 can be placed in parallel.


Electroprop Fused Power Rail

All fuses are within 6 inches of the terminals.   All Fuses are Waterproof with Boots.   All Conductors are Insulated by Grey and Black Large Conduit.   Connections for Multibank chargers are fused in the Power Rail.

Electroprop Racer Drive:  

The Electroprop Racer Drive has been refined through the years to be  lightweight and powerful in a small package.

The Mounting System:   Racer Drives are lagged down to an Beam Glassed across a section of the boat.   Requires Professional Glasswork.

The Permanent Magnet, Double Stator Motor:   The Racer Drive features a Permanent Magnet AC motor that gets its power from a Sevcon controller which makes AC out of the DC from the battery pack.   The motor is run at 4,500 rpm, well within the motor and gearbox rpm capability.

The Planetary Gearbox:  The Planetary Gearbox is capable of running at up to 6,000 motor rpm.   This unlocks the power of the Permanent Magnet Motor.     The Planetary Gearbox is very quiet and powerful with precise German Gears. 

The Sevcon Controller:   Known in the industry as the toughest, most reliable, most efficient controller.    We simply can’t say enough good things about the Sevcon Controller.   Over the years we have refined the software to maximize efficiency.    Sevcon and the folks that run this company are first rate.   I have visited the Main Headquarters in England and worked extensively with the technicians in Boston to develop the best firmware and settings possible for our application.    Many thanks to Sevcon for a great product and a great team to back it up.  

The Sevcon Clearview Display:   The Sevcon Clearview display provides detailed information on the status of the Motor and the Controller, including Motor RPM and Temperature,   Battery Voltage and Current Consumed by the Drive, controller temperature and Operating Status of the Drive system.    We build a drive system to be as reliable as we can, and constantly improve our products, but we can’t predict operating conditions in the marine world including moisture, water or other issues.     For these reasons we like to enable the operator with as much knowledge of the drive system as possible which is the main function of the Clearview display.    Apart from providing all the operating data, the Clearview gives fault management to enable an operator to quickly find any potential issue that might arise in the marine environment.    The Clearview enables the boat owner to troubleshoot the drive system to give the operator the knowledge to bring the boat home safely.   Its important to us that we give you access to information so you can operate the boat to its fullest potential.    The Clearview gives an interface that allows proper sizing of the propeller, proper rpm for the motor, and different acceleration rates to personify the drive to your liking.   The Clearview is mounted in the drive enclosure to protect from the effects of lightning.    The Clearview has been custom programmed for Electroprop for Sailboat Propulsion.

Throttle:   CAN Switch Throttle or Cable Actuated Hall Sense Throttle

Cooling Fan:  A fan is provided to be mounted in an owner provided shroud to direct airflow across the Racer Drive.

The buildup of heat is the limiting factor to continuous power output.   All motors when cool have high intermittent ratings, often two to three times or more of the continuous power rating.   In order to get high continuous power rating, ambient temperature has to be kept cool.    Boats are different from cars and other applications because they are running on continuous power ratings.

In order to maintain low ambient temperatures, the Racer drive is provided with a SPAL fan to be mounted by the installer.   In order to achieve high power ratings for the larger race boats, the Racer Drive should be enclosed in a fan shroud built by the installer out of light weight materials.     One Puller fan is supplied with the Racer drive, with an optional pusher fan available.

Running on cooler air also has the advantage of increasing the efficiency of the drive motor, which more than pays of the power consumed by the fan.    Each Electroprop drive system includes SPAL fans, known in the industry to be the best fan for cooling a motor and widely used in the automotive industry.

The Propeller:     Owner supplied or choose from several different feathering propellers.



High Power to Weight Ratio

The Light weight Racer Powertrain has been engineered to provide the highest levels of safety, efficiency, reliability and power.     We will work closely with your installer to build a very light weight drive system.   Mounts, Ducting and Fan Shrouds can all be made from carbon fiber.    The Drive itself weighs in at 60 lbs yet can develop as much as 18 KW!    Your Raceboat will be light and powerful.    A drive system that is in tune for how you race your boat.



Our standard system includes what we feel to be the ultimate, complete set of components for a safe, reliable, powerful drive system.    By carefully measuring where you mount the various components, we can customize and prefabricate the entire wiring system to minimize installation time.   Various components can be removed or added to the system to make it ideal for your boat or your budget.

Win your next race with a Racer Powertrain by Electroprop.