I actually built one last year and another this year. I was just looking around the web to see what others were doing. I used one of those 24 volt scooter motors for a generator. It works very nicely. I am an avid cyclist so I ride all winter long in my basement anyway, just thought I would put that power to good use. It charges a small 9Ah battery connected to an inverter that powers the tv I watch during my workout.
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