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I've never considered allowing more than a 3% voltage drop but now that you say it, it makes sense. I'll have to look into that a little more.

I am looking at installing a 15.7kW ground mount, grid tie system. The distance from the array to my house is about 410'. I may expand this system, maybe even double it in size in the future. I am wondering if it is generally better/more economical to run the distance at a high DC voltage or...

I do not have a good source for larger wire sizes. From a cost perspective, multiple higher voltage DC runs compared to maybe one very large AC? If that is even possible.

Why do you say "a wiring path over 820'" if the distance is 410'?