A pedal generator for a chainless bike or human power - electric serial hybrid. Easy to build DIY project presented by Thomas Senkel. Free Plans for aluminum parts included at 0:43 in this video.
A Keyde front hub motor is used as a generator. It is nominal rated with 160 rpm @ 36 V and 250 W.
Keyde 98SWXN36 with 160 rpm
http://www.keyde.com/en/Product/motor...

You dont need any electronics, just a 3 phase bridge rectifier. The lithium ion battery is 12s (44 V) and 2x 25 Ah. The motor power is up to 5 kW.

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