OwnerFrank John
Owner's Other EVs1974 Harley Davidson Aermacchi
1994 Toyota Pickup
LocationBrooklin, Maine United States map
Vehicle1976 Suzuki GT550
I broke a con rod on this normally bullet-proof bike and decided to convert it.
MotorD&D Motor Systems, Inc. ES-10E-33 Separately Excited DC
6.7" Sepex Motor
DrivetrainD&D Sepex Motor with Sevcon controller. 14 X 65 teeth sprockets
ControllerSevcon Powerpak
For 72 VDC nominal. 12KW output
The controller is set up for 130A max regen which is like a medium application of brakes. I used a PB-6 potbox; just opening the throttle a bit (to activate the microswitch) allows regen-free coasting.
Batteries24 Thunder Sky LFP-100AHA with yttrium, 3.30 Volt, Lithium Iron Phosphate
24 100 AH cells in series...
System Voltage72 Volts
ChargerRussco Lithium
This charger can work with a BMS.
DC/DC ConverterSevcon
300 watt
InstrumentationStock speedo, Cycle Analyst
Top Speed65 MPH (104 KPH)
Function of power, gearing, aerodynamics and field current.
AccelerationNot bad - similar to stock motorcycle up to 60 mph.
Range45 Miles (72 Kilometers)
Range obviously depends how fast you go. I estimate 45 miles at 45 mph to 70% DOD, riding for "fun." At 30 mph this thing could go 70 miles at 70% DOD. Improved aerodynamics would make a measurable difference. It's basically a box going through the air now.
Watt Hours/Mile125 Wh/Mile
Function of speed.
Seating Capacity1 adult
Curb Weight400 Pounds (181 Kilograms)
Slightly heavier than stock. Weight is aft a bit far but the bike handles well.
Tiresstock size
Conversion Cost~$5K w/o charger
I still have bodywork to do on this bike. I'm pursuing an aerodynamically efficient fairing of some sort plus something to help close up the back of the bike. It takes 5-6 KW at 45-50 MPH; reducing this by 30% would have a large impact on range at speed.

code by jerry