Dynamo bike hubs and battery packs
The concept isn't exactly new and neither is this product, but the Busch & Müller "e-werk."
This collects electricity from a dynamo bike hub into a battery. It's one way to decrease reliance on a home solar PV system and enable earthship off-grid living for small appliances like charging cellphones and other small DC devices. This would require not only this device, but a dynamo hub, so the whole package could cost as much as $250.
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