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Maximum solar = 1 kilowatt per square meter. Efficieny of solar panel = 10-17%.
10" diagonal = maximum of 7.07 on a side = 50 sq inches
a sq meter = 1550 sq inches. So maximum solar flux = 50*1000/1550 = 32 watts. Using a poly panel @ 10%, you'll get a maximum of about 3 watts. In practice, if there is any voltage conversion or mismatch, it will be lower. And this is at NOON with the panel oriented perfectly to the sun. The maximum you can expect from a panel that size is about 15 watt hours per day. If the battery is 3.6v (pretty standard Li-ion) and 2000 mAh, that is about 7 watt hours.
Again, this is if the panel is perfectly oriented...
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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