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I need advice on my setup plz. Im 75 years . My first time here. Decent with 120v,240v, no solar exp.Have 7 300w solar panels on my garage roof.I bought 7 because i thought I read that a blu AC 200 max could take 2100w. 300wx7=2100w. 7 panels grounded to rack,grounded to earth. 10 ga. Copper...