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Hello. Im new to solar energy and would like to build my own solar powered phone charger. I have tried to learn as much as I can from these forums as well as the wider internet, but please forgive any naivety. My main concern is cost, although I would set myself a target of charging a 3.7V, 1420mAh battery in under 10 hours. I will use this example battery throughout this post. Firstly, Im looking for clarification that my calculations are correct: if I have a panel outputting 100mA at 3.7V, would this mean it would take me 1420/100 = 14.2 hours to charge said battery, assuming the phone was not consuming any electricity during the charging period?
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