
#1
Apr1310, 03:57 PM

P: 2

I have a 230 CAA car battery, and 2 solar panels in a parallel circuit (one is 15V, 300mA, 4.5W, the other is 15V, 125mA, 1.8W). I know that these are under optimal conditions, so please assume that they are. How long would it take to charge my car battery with these solar panels?




#2
Apr1310, 05:36 PM

Mentor
P: 21,998

A standard car battery is about 40 amphours, so if you get about the right voltage from your panels, that's 40/(.3+.125) = 94 hours at peak power. You'll be lucky to get that 4 hours a day on average unless you aim the cells, so that's about 23 days.




#3
Apr1310, 06:57 PM

P: 2

How can I find out how many amphours a car battery has for sure?




#4
Apr1310, 08:40 PM

Mentor
P: 21,998

How long does it take to charge a 230CCA car battery?
Find the model number and look it up online.



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