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On my commuter bike, my front dynamo hub charges a small 18650 battery that I then can tap to provide power to my smart phone. You need to have an intermediary battery because most dynamos only produce the German government mandated 6VAC / 3 watts minimum, which is around 0.5 amps (500 milliamps) -- and this is only when you're going faster than 15 km/h. ...


Check out this tech of my company Roadie Solar http://bicyclepatents.com/keeping-your-devices-charged-in-the-field/2220/ They are new but very light and fits on a bike rack. Possibly the lightest solar charger you can find on the market We are doing a kickstarter Next week.

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