I use two 6v batteries wired parallel, Each battery is rated at 232AH in parallel it stays the same only voltage adds up, hence I have 12v at 232AH. Plenty as long as i start out full. We run the refer, and two TV's during the night, handles it right nicely. But then I have 400w of solar power on the roof too, to bring them up to charge again during the day. The more batteries you have, means longer charge times as well. Figure out your needs, you may not need four batteries.
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