Solar Panel Layout?

alliemac9 wrote:
MC4 connectors...what is the typical process here? Do I need to find an outfitter that sells MC4 pigtail in the length/gauge I need to get to the combiner box on my roof? Like this?

Usually people don't replace the pigtails for parallel wiring. Instead they pick up the closest length of MC4 extension cable to run from the pigtail to connector box. Or - from the MC4 Y-splitters that combine 2 pigtails, to the combiner box. There are places to order a custom length of MC4 extensions, but you can just use the closest length, err on the longer side, and use #8 rather than #10, between the panels and combiner box. Cut the excess cable off, together with one MC4 connector. Combiner box uses bare wire ends on terminals, not MC4 connectors.

I like Ulimited Solar - US made, reasonable prices, good assortment. Unknown Ebay cables may have poor quality wire, sometimes aluminum wire coated with copper, rather than pure copper.

Edit - PS:
If some pigtail is so close to the combiner box that you don't need an extension, you just cut MC4 connectors off the pigtail.