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

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Charging a 230 CCA car battery with two solar panels rated at 15V, 300mA and 15V, 125mA would take approximately 94 hours under optimal conditions. However, considering realistic sunlight exposure, averaging about 4 hours of peak performance per day, the charging time could extend to around 23 days. To determine the exact amp-hour rating of a car battery, users should locate the model number and search for specifications online. This method ensures accurate information regarding battery capacity. Understanding these factors is crucial for effective solar charging planning.
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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?
 
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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.
 
How can I find out how many amp-hours a car battery has for sure?
 

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