The Sol-Ark caclulator shows #10 at 600 feet good to 9.4 amps. 9.5 amps shows wire size needs to increase.I’d have to go pull my sheets to be accurate but off the top of my head around 300v and 13-15 amps. I have a 44 300w array. I split them up into 2 strings of 18 and one string of 8.