In addition to the "How much money's worth of electricity would exercising on a stationary bike generate?" Is there a way to store the energy produced by multiple machines(stationary bikes, olyptical trainers, etc.)at gyms or fitness centers?
by 
breve_ocho
ANSWERS: 4
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Photovoltaic Solar panels can store the collected energy in batteries/accumulators. Really big solar installations do hydrogen generation by electrolysis of water and store the hydrogen. The same techniques can be applied to a gym full of spinner with generators, I guess.
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think of how much energy they could generate in LA!!!
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They investigated this question on "The Nakes Scientist" podcast. Ultimately, the answer was that the machinery you'd have to use to collect the energy from each bike, etc. would be more expensive than the energy you'd ultimately extract.
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You simply setup a battery array to store the energy. The more batteries the more you can save up. Here is a great page that explains bike generators and how useful they can be: http://renewable-energy-future.com/do-it-yourself/bike-generator.php
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