How long does it take to charge a 230CCA car battery?

SolarFreak

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?

russ_watters

A standard car battery is about 40 amp-hours, 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.

SolarFreak

How can I find out how many amp-hours a car battery has for sure?

russ_watters

Find the model number and look it up online.

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SolarFreak	How long does it take to charge a 230CCA car battery? Tweet 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?

russ_watters Mentor	A standard car battery is about 40 amp-hours, 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.