I have a large south facing barn Typical metal roof, it’s 25 feet wide and 50 feet long it’s about a four or five pitch roof, I haven’t measured it. The barn has got number six wire running to it from the house where the main panel is. It’s on a 50 amp breaker. it is a very long run of number six copper wire from my barn up to the main panel on the house probably around 400 to 500 feet but to be clear it’s already in place. I can fit about 15k-16k depending on how I arrange the panels but if I put my inverter in the barn, is there a problem with backfeeding my panel through that number six wire and 50 amp breaker? It’s just the easiest way to mount a bunch of panels 
My house usually uses about 75 kW per day

My house usually uses about 75 kW per day

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