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For an off grid 4kw solar continuous use 10kwh battery system which batteries are going to be the best choice Flooded LA AGM Lithium Lithium batteries are going to be over twice as costly to buy

I’m just connecting my Solar panels I have 4 x 48v panels and I an seeing 450v plus on the multimeter with no load, is this the expected DC voltage

Hi Please check my calculations 10 48volt 420w panels connected 2 strings of 5 each 2100w at 240 volts 2 strings connected in parallel - 4200w @ 240 volts = 17.5 amps Max inverter input is 250 volts Wiring from panels to inverter is 20m is 4mm solar cable large enough?. Is a 20 amp DC fuse...