May 14, 2010 AT 12:20 pm

Estimating battery charge time from solar

Battery-Charge-235X235

Jeff writes -

You have a 2 Watt, 6 Volt panel and a 1,000 mAh, 3.7V battery, how long does it take to completely charge? The quick and very wrong answer would be to figure out the Watt hours of the battery (3.7 * 1Ah = 3.7 Watt hours) and divide. The reality is about 2.5 times longer.

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