To Tom. I am not sure what you are trying to do. I have been playing with rv and solar stuff for years and perhaps I can help. but I don't understand the issue.

Basically I use a Trace regulator to control charging to my RV batteries. It is a 3 stage regulator. I run everything thru it, solar, generatory, alternator and A/c battery charger. I use AGM batteries which are pretty picky about overcharging.

Sorry I missed you in Fla. (wilma). I was at one of the kitchens you were at, but I had other things on my mind and did not think to hunt for you. Can't remember the name of it now, but it was SE of the lake.

So try to explain your need again and keep it simple for my simple mind.
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...........From Nomad.........Been "on the road" since '97