![]() ![]() That means that even at max capacity, your solar panel would take 4.8 hours to charge the car battery, assuming nothing failed before then. Generally, a car battery has 48-or-so amp-hours (AH). Car batteries are rated in CCA / Cold Cranking Amps, which is the amperage it can deliver at 0☏ for 30 seconds, while maintaining a voltage of at least 7.2V. However, 10A at 12V is a very small amount of energy (120W). Yes, some are tied to ignition, some are not, the shop will use a permanent-power port for this, so they avoid that problem altogether. When a shop needs to change your battery, they plug one of these into a cigarette lighter port, then take the battery out. ![]() Generally speaking, cigarette lighter ports are bi-directional, that's how memory keepers work. If charging were limited to less than 10 amps, would solar panel -> charge controller -> cigarette lighter outlet work for charging a car battery. My vehicle's cigarette lighter outlet is limited to 10 amps output. There's a lot in your question, so let's look at it in parts: I run such a setup myself in my micro campervan with a 120W panel and a MPTT charge controlelr to keep food and drinks cool. ![]() You can also connect a (fused!) pair of wires from the battery to a place where it is convenient to connect the charge controller with a high current connector, e.g.
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