Parts placementWorking on the (3) on board chargersWhere to hide 6 AGM's!The Naked Look
OwnerPhilip
LocationHamilton, New Jersey US map
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Vehicle2003 Kawasaki Ninja EX250
MotorMars 72 volt version / ME0709 MARS Permanent Magnet DC
Nice motor. 50 rpm/volt. 36 pounds. Made in China. Some call ETEK-RT
Drivetrain#40 chain running on 14 / 72 sprockets (5.1:1). Geared for 50 mph.
ControllerKelly KD724001
72 volt, 400 amp brushed motor controller with regeneration. Very smooth.
Batteries6 PowerStar 35 AH, 12.00 Volt, Lead-Acid, AGM
Scooter / UPS type AGM battery. 24 lbs each.
System Voltage72 Volts
Charger (3) @ 24 Volts / 3 amps each.
(3) 24 volt 3 amp scooter smart chargers. Seem to work well, three automatic modes, bulk, equal and float.
Heaternone
DC/DC Converter
Separate 12 volt, 9AH Battery and on-board charger for lights and contactor. I added a headlight switch.
InstrumentationCycle Analylst. Nice unit.
Top Speed50 MPH (80 KPH)
41mph with 12 tooth, 45mph with 13 and 50mph with 14 tooth.
AccelerationVery good, keeps up no problem.
Range20 Miles (32 Kilometers)
I never go below 70 volts which gets me 20 miles. I could get over 20 if I try, but don't want to kill the AGM's....they will die soon enough....~300 cycles?
Watt Hours/Mile90 Wh/Mile
For every (1) hour I charge, I can ride (2) miles on average.
EV Miles
Start:1,030 Miles (1,657 Kilometers)
Current:1,600 Miles (2,574 Kilometers)
Total:570 Miles (917 Kilometers)
Seating Capacity2 adults
Curb Weight308 Pounds (140 Kilograms)
About the same as the gas version.
TiresStock at 38-40 psi
Conversion Time~80 hours so far.
Conversion CostBike was $1000, however I sold engine for $700. About $1500 for motor, controller, batteries and accessories. Just under 2k total, I mean.....so far!
The Ninja 250 is a very good bike to convert. Light weight, good brakes and shocks, plentiful parts on ebay, fairing to hide everything. I just added a 12v 9ah battery and charger just for the 12 volt system. Waiting for PSI Lifepo4's to come down in price (like everyone else). A 72 volt, 50 ah pack would be very nice!

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