Thanks for the very helpful video, Drew. But if you may ever edit/revise it, note that at 5:35 you don't actually show sliding the seal and strain relief into position before covering them with the end-cap, which could be confusing to folks getting started with things. That said, you DO show it more clearly on the next connection at 6:45. Not a huge deal for people who see both, though it would have been less noticeable if it was the first which had been shown completely. :-)
Would there be a detriment to using 8 gauge instead of 10 for a 12-volt 100W panel in a parallel array of 4x of these 100w panels, besides that it might be hard to find typical housing of a general solar junction box that would accommodate 8 AWG wire? I've seen others use 12 and it always bothered me, but seeing you used 10, I figured I would pop the question.
You advocate that male pins go in female connectors but this is inconsistent with information published elsewhere. How does one resolve opposing viewpoints. Is there a standard associated with MC4?
Just a friendly reminder. The picture you showed there seems to be wrong. I mean the picture of male connector and female connector need to be reversed.