Quote:
Originally Posted by Mikesolar
If you are going to run a 3kw system, and are using Enphase M215 inverters, you will only need to run a 14/3 wire plus your #6 ground wire for the racking (assuming your code requires it and AFAIK they all do). Each inverter will output a max of 0.9Aac so with a 250w panel you will have 12 x .9A x 1.25 (safety factor) = 13.5A. You will need to go to a 15A double pole breaker.
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I've been thinking about this and I just don't think this is close to right. I think you are leaving out something big - voltage drop/foot per gauge of wire.
Also you have to multiply 60' x 2 = 120' for up and back total length of homerun wire times that resistance. Also, though I didn't say it, I intend to have no more than a 1% V drop from the 240volts = 2.4 V. Finally, my plan is to have 14 panels not 12, which I think I stated. The .9A x 1.25 is correct.