Thanks to all for the helpful answers. Right now I'm planning on 14 60 cell panels. That's so close to the maximum number on a circuit I'll just plan on wiring for the maximum (for expansion later), which works out to 10 gauge for a 60 ft run. That was useful information about the neutral wire only taking 5 percent of the current normally in this application. I didn't know that.
Right now I'm tempted to just get some armored shielding and anchor one end under the roof at a box and run it out the roof. Then I would just run 10 ga romex through it and terminate the other end at the pv central junction box. I know that legally you are required to not run unspliced wires through boxes. And the box under the roof where the armor is attach certainly wouldn't need to have the wires cut and rejoined. It would be better NOT to do that electrically. We'll see.
I haven't gotten to look at those references you put up, Pinballooking, but I look forward to soon.
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