Planning to run 15kW PV into four outback flexmax80 charge controllers. The home runs from the array combiners to the house are about 200 feet. I was hoping to get by with a #8 awg copper thwn-2, but I end up with over 7% voltage drop. Unfortunately there's 15 strings of 3 modules each, operating voltage about 100.
Ampacity of #8 looks ok when using the Isc @ NOCT and correcting for underground temps, but the Vdrop of 7%-8% is bothersome. Will that raise current in the circuit? Is there an NEC requirement for PV output voltage drop? It wouldn't be bad to shed some volts and power over the home run, the system will be overcharging batts as is.
Advice and suggestions appreciated,
Ampacity of #8 looks ok when using the Isc @ NOCT and correcting for underground temps, but the Vdrop of 7%-8% is bothersome. Will that raise current in the circuit? Is there an NEC requirement for PV output voltage drop? It wouldn't be bad to shed some volts and power over the home run, the system will be overcharging batts as is.
Advice and suggestions appreciated,
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