Wouldn't spin bikes make better generators? I think the average person could probably generate close to 100 watts for almost an hour. Most of the spin classes I have attended had something like 20-30 bikes, that would be 2-3 kwh's generated each class, and usually there's at least 2 classes a day. Surely that could run the lights for a gym and contribute to the air conditioning usage. Especially if the lights were all high efficiency LED lighting.
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