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Jeffrey Said:
Questions about a Photovoltaic Charger for a Cell Phone...?We Answered:
My suggestion would be to make it comply with USB power requirement (500mA at 5V.) Then it could be used with pretty much any phone.You can use lower voltage cells, then boost to the 5V level with a switching step-up converter. The main thing is to have enough wattage. If for example you have only 2.4V@100mA, then this will be only 4.8@50mA... not enough. You need 500mW of cells, with some margin - I suggest 750mW.
Good luck with your project...