From what I have seen an adult in decent shape can put out around 75-100 watts of usable electricity on a bicycle with a generator on it, if you built it I would say that you should use a synconise motor as a generator and gear it so that motor starts to generate when you are pedaling around 70 RPM as that is a nice pace, then have a switch that doesn't make a connection until you hit that speed, this would do away with an inverter and everything else making it really simple.
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