Cable type and size

[Mikesolar]

Originally Posted by Exeric

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.

Standard design for voltage drop is 5% max, 3% in a branch circuit and 2% in a service. I have been doing solar systems for 25 years and never had a problem following these rules.

17 inverters on a 12g wire is fine, use a 20A breaker but as I had stated, IF you were to use 12 inverters, a 14/3 wire would be just fine over that length. 14 inverters is definitely a 12/3 wire. Of course if you want a 1% drop, it certainly doesn't hurt.