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09-16-2010, 02:25 PM
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#5 |
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Senior Member
Join Date: Mar 2009
Posts: 2,384
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If I remember correctly, when the voltage is held constant, then amps = watts/volts. So a 5 watt solar charger is only going to give you 5/12 amps per hour of charge. So 12 hours charging time will produce 5 amps. Might need something in the 12 -15 watt range to keep that size battery charged (with the spare battery charging all day).
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