Thanks for all your replies. Much appreciated.
I just got to looking at the wire leads with MC4 connectors on the solar panels I just bought, and I don't think the wire is even close to 10 gauge, seems smaller. So now I'm thinking that maybe I'll just un-solder those pigtails from the junction boxes on the solar panels and as someone here suggested, solder in my own wires to the combiner box. Therefore no MC4 connectors needed.
So if I do that, I'm thinking that I would prefer to just go to 8 gauge wire. But I'm having some difficulty finding 8 gauge UV resistant copper wire in bulk, say 50 ft rolls. Any suggestions as to where I could buy 8 gauge UV resistant copper stranded wire reasonably? I've checked on the sources mentioned, and so far didn't find any.
