It will be a direct run from basement to attic two stories, about 25'. As I plan to grid tie if I'm doing any PV I might as well cover front of roof. I have to cross a couple of top and bottom plates so I'm not sure I have clearance for 1" but will try for it(may have to flattened it in some places). Is a ground wire required? I am still very uneducated in the wiring world of PV. Am concentrating currently on building of structure and learning hydronics for infloor heating.
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