Pedal-electric Hopper may be the German "car" you didn't know you wanted.
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The rider's pedaling power is augmented by a 250-watt rear hub motor, taking the Hopper up to a top speed of 25 km/h (16 mph). The motor is powered by a removable 30-Ah/48V/1,440-Wh lithium-iron-phosphate battery, which is claimed to be good for a range of approximately 65 km (40 miles) per charge. An optional rooftop solar panel should help boost that figure.
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In order to minimise maintenance and mechanical complexity, the Hopper utilises an electronic pedal-by-wire system instead of a traditional chain-drive drivetrain.
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Such systems work by having the rider spin up a generator as they pedal. Doing so converts their mechanical energy into electrical energy, which is fed into the motor. That motor converts the electrical energy back into mechanical energy, which is used to turn the wheel.
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