Thanks Mex. I won't tell anybody about the Delta T, so your secret is still safe!
Thanks to Mex and the others on the forum helping out over the years, it looks like our set-up for our situation is as fine-tuned as it will ever get. It is a different deal for an RVer who is on the road and different again for an RVer who is full-timing all year as conditions change radically with the seasons. We have it easy only being off-grid on solar in the same spot every year during the sunny part of the year.
As with other topics, forum members just have to cherry-pick any of this arcane solar and battery stuff that might apply to them.