Thread: How long will it take to recharge a 10 000 mAh using a dynamo?
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Old 03-26-16, 03:52 PM
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znomit
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Originally Posted by gauvins
Considering building a wheel on a Shimano DH-T780. The dynamo is rated 3W@6Volt. (that would be 0.5A).

So far so good.

Now, how long will it take for such a dynamo to charge a 10 000 mAh battery bank connected through USB? I assume that this is a function of the speed (assume 20kmh) and the efficiency of the transformer (??). (If the bank is 10 Ah, a 100% efficient process would require 20 hours @ .5A)

Anyone knows either the maths or has experience with such a setup?
What are you doing with the battery pack that will need 10,000 mAhr between rides?
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