OwnerSeth Allen
LocationNew Hampshire US map
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Vehicle1971 Mercury converted outboard motor
(stripped 2 stroke)
MotorGeneral Electric Separately Excited DC
2.7 Kilowatt 30 minute rating at 48 Volt
Drivetrain1971 Mercury 7.5 Hp motor case with Lovejoy couplings and a steeply pitched prop
Controller
scratch built MOSFET low side switch, 22kHz PWM
BatteriesSaft BB-600, 0.00 Volt, Nickel-Cadmium, Flooded
military surplus, 30 Ah
System Voltage68 Volts
ChargerSorenson
80 Volt 13 Amp power supply or Manzinita Micro PFC-50
HeaterHeat? I need more sunscreen!
DC/DC ConverterAstrodyne
wide range input for controller logic only
Acceleration0 to 7 Knots in a few seconds
Range2 Miles ( 3 Kilometers)
againt the tide and wind
Seating Capacity4 adults?
Curb Weight75 Pounds (34 Kilograms)
motor
Tires9X7, 9X9 3 blade props 9.5X12 2 blade prop
Conversion Time1 year (controller development)
Conversion Cost$300 in parts, lots of leftovers and tools, though
Additional FeaturesCycle by cycle current limiting
Variable field weakening for more power
Weight is similar to 4 stroke outboard (minus batteries)
problems with cavitation, not power, right now.

code by jerry