Here’s how to charge your lead-acid car battery with a solar panel.The simplest way: Get a voltmeter and a solar panel. Connect the panel to your battery and watch the voltage rise. When it gets near 14 volts your battery is charged. Disconnect your solar panel to keep it from overcharging your battery.Your battery can be damaged if you charge it too fast, so don’t get a panel that’s too big for your battery. Consult the battery manufacturer’s data to see how many amps it can handle, both while charging and discharging. If you happen to have a big panel and a little battery, there are tricks further along in this instructable.
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