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Solar Battery Charger 12v
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What time it would take for a 1.8 W (12v) Solar Panel to charge a 300w (12 v) battery?
This is under the best sunlight conditions, the solar panel is rated at 1.8W and the battery pack is 300W. The solar panel reads that it is a "trickle charger". My question is how long it would take such solar panel to recharge a completely empty battery pack.
If the battery wouldn't self-discharge, it would be:
300W/1.8W = 166 h 40 m
With 12 hours of sunlight per day, it will take about 14 days.
However, since all rechargeable batteries self-discharge over time, it would take much longer, if it could be done at all. Many batteries give a figure of 1% per day loss, so that would be 3 W per day, or 1 h 40 m per day required just to recover to the level of the previous day. So, if there were only a 1% loss per day, you'd only get a net gain of 10 h 20 m per day. That would take a total of 16 days of 12 hours of sunlight.
If you lost 8% per day, you could never fully charge the battery...
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