LocationAustin, Texas United States map
Vehicle2009 Electric Motorsport GPR-S
Street legal bike up to ~70 mph with 15-tooth sprocket. Fun bike that's easy to ride.

The original configuration was with SLA cells. Range was too short so I upgraded to LFPs. It's much more useful now. One of the great features of the GPR-S is its modularity and flexibility. Few other bikes even have the option to upgrade to a completely different battery chemistry.
MotorD&D Motor Systems, Inc. Separately Excited DC
DrivetrainDirect drive D&D Sepex regen motor with Sevcon PowerPak. Up to 25hp / 4500 rpm.
ControllerSevcon PowerPak PP784
Batteries24 Thunder Sky 40Ah, 3.20 Volt, Lithium-Ion
TS LFP (lithium iron phosphate) batteries
System Voltage72 Volts
Top Speed70 MPH (112 KPH)
Range30 Miles (48 Kilometers)
Upgraded from SLA to LFP which tripled the range.
Watt Hours/Mile100 Wh/Mile
EV Miles
Start:9 Miles (14 Kilometers)
Current:1,020 Miles (1,641 Kilometers)
Total:1,011 Miles (1,626 Kilometers)
Seating Capacity2 adults
Curb Weight310 Pounds (140 Kilograms)
Conversion Cost$6700 + $3300 (LFP upgrade)
Additional FeaturesRegenerative braking
Integrated charger w/ power port (mod)
USB charge port (mod)
Standard motor mount points allow for easy upgrades
LFP battery upgrade
Getting support from EMS has been a struggle.

code by jerry