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Electric motorcycle/moped conversion - $300 (Somerville)
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1975 Batavus Moped
Motor: Original Etek, 80V and 330 Amp max (26 kW / 35 hp)
Controller: Kelly KDH14401B - 400A, up to 144V, Regen
Battery: 3.3 kWh, 300 amp Li-ion custom pack. 20s pack cylindrical cells (VL41M, 41 Ah each, 300 Amp peak current).
Top speed 60 mph (gearing limited), I've gotten ~ 70 mile range around town.
Have some documentation for the main components, fabrication, and current operation, or harvest the parts for your own build.