What kind model micro inverter are you usin ? 3k micro is pretty big micro.
By cb your talkin about your power main where the power come into your house right im guessin ?
If you have a 220 power main you will come out cheaper by using 220 volt from the inverter to the main.
More things to consider how much voltage drop is acceptable here in your install and how much volts does the inver put out ?
But for 120 volts at 75feet in conduit copper wire 3% voltage drop your goin to need some pretty pricey wire . 8 awg. Thatll keep you at around give or take 3% voltage drop
|