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265w/12volts=22amps. Your controller will need to be upgraded to handle any additional panels. 4 panels x 265w=1060w total. 1060w/12volts=88amps. I’d go with a 100amp controller at a minimum. You’ll never get a true 88 amps out of your panels because they aren’t 100% efficient, but you want some margin of safety. More batteries is good as long as the extra weight isn’t an issue.
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