Quote:
Originally Posted by bat119
Just so you know about solar charging power
Watts divided by volts = amps charging
44/12= 3.67 amps charging under ideal conditions divide this in half for sun angle, clouds etc.
An average 12 volt battery has about 50 usable amps it would take about 27.4 hours of daylight to recharge a discharged battery.
The good news is you only need put back in what you use if its just a few lights a solar panel will keep up, if you plan on watching TV look at something bigger.
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well you are sort of correct
the panel is a 40w at 19.7 volts and 2.03 amps output
they come with a cheap pwm charge controller that clips the volts
to charge volts of 14.5 and 2.03 amps the amps stay the same.
now if he upgraded to a mppt charge controller ($300 for a cheaper 10 amp one )w/v=a 40w at 14.5 = 2.72 amps