LocationAustin, Texas US map
Vehicle2002 Kawasaki 250
Donor cycle with blown engine. Initially
converted with 72v SLA, but had range of only 10
miles. Updated with 72V 30Ah LiFePO4s.
MotorMars ME0709 Permanent Magnet DC
Used ME0709 (3300 RPM, 18HP peak, 24-72v DC.
Had to file a couple of brushes because they
were sticking. That was pulling down power (and
Current consumption).
Drivetrain45/19 gear ratio.
ControllerAlltrax 7234
72V/300A max
Batteries24 Hi-power 30Ah LiFePO4, 3.30 Volt, Lithium Iron Phosphate
System Voltage72 Volts
Charger 72v generic
To keep price down, I purchased a generic
charger that produces 5A/h (full charge in 6
hours from depleted).
DC/DC Converter Generic 24-72v to 12v
Top Speed52 MPH (83 KPH)
There's something wrong here.. Only pulling 92A
max. Should be able to pull 125A+. Changing
the brushes to see if that will fix it. @125A,
speed should be 65-70mph.
AccelerationLike a car. If I get the amps up, I'll decrease
the gear ratio.
Range28 Miles (45 Kilometers)
Still need to test limits
Watt Hours/MileStill need to test
Seating Capacity2 adults
Curb Weight300 Pounds (136 Kilograms)
Not sure
Conversion Time200 hours
Conversion Cost$2400
The goal was to hide the batteries and provide a shorter range/low
cost solution. Originally, I thought 27Ah SLA batteries would give
me about 20 miles, but learned quickly that you're lucky to get 6Ah
out of them due to high current draw. For $400 more, I gained 24
30Ah LiFePO4 batteries. Well worth the extra cost. I put the cutoff
down low. Not sure what to do with the tank. It's just cosmetic at
this point. I would like to mount the charger plug in there, but
it's a PITA.

code by jerry