BFL,
Yes, that's what I'm wondering about... how much of that Isc can I expect to see in winter? Amp hour wise, I don't imagine I'll replace what I use for heat and fridge controls, although that was what I was hoping for. Hopefully I can do a trial run next week.
I think I'll be pretty good as far as V loss goes. The full 50' of 6ga cable will only be used when necessary, so usually only 20'.
Once I establish insolation for a given day, can I then calculate what to expect amp hour wise, or will that just come with experience?