Assuming that the weather is 30 Centigrade of a sunny weather in Poland. Thanks.
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How long it will take 50Watts Solar panel to fill up Battery of 12V and 20Ah?
Posted on 03 July 2010 by admin
3 Comments
Nasim
on 3rd Jul, 10 06:07pm
Energy to be stored = 12 x 20 x 60 x 60 = 864000 J
Time required = Energy/ power = 864000/50 = 17280 s
17280 s = 288 minutes.
It will take 288 minutes. i.e., 4 hours and 48 minutes
JAMES
on 3rd Jul, 10 07:07pm
4.8 hours
billrussell42
on 3rd Jul, 10 07:07pm
Nasim is mostly correct, but he made some assumptions.
first, that the sun is shining brightly on the panel and there are no obstructions. The panel has to be perpendicular to the sun, and the panel has to be adjusted to keep it that way as the sun moves across the sky.
second, that the output of the panel is perfectly matched to the battery. In this case, you will need a 50 w solar panel that will deliver 14 volts at 3.5 amps. A 12 volt battery needs to be supplied with 14 volts before it will charge.
third, that the battery is perfect and ideal.
20 amp hours / 3.5 amps = 5.7 hours. at best. I’d hope for 8 hours at best.