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Mikesolar · 09-03-14, 05:51 AM

Assuming a 250w panel and the slightly older M215 inverters, there is a max of .91A x 60 panels = 54.6A x 1.25 (safety) = 68.25A.

So you would need a #4 wire as #6 is only approved up to 60A. Note that you are on the low side of the capacity for a #4 (at a minimum) so without doing much more calculation, I suspect you would be quite good for voltage drop too. #2 is more typical for a 100A service (if you use a 90C wire).

09-03-14, 05:51 AM	#11
Mikesolar Master EcoRenovator Join Date: Aug 2012 Location: Toronto Posts: 958 Thanks: 40 Thanked 158 Times in 150 Posts	Assuming a 250w panel and the slightly older M215 inverters, there is a max of .91A x 60 panels = 54.6A x 1.25 (safety) = 68.25A. So you would need a #4 wire as #6 is only approved up to 60A. Note that you are on the low side of the capacity for a #4 (at a minimum) so without doing much more calculation, I suspect you would be quite good for voltage drop too. #2 is more typical for a 100A service (if you use a 90C wire). Last edited by Mikesolar; 09-03-14 at 05:56 AM..