vermilye wrote:
Unplug the portable, the controller stays at 13.6V but jumps up to 4.1 amps. Why?
You have too many inputs and they are interfering with each other.
It is almost always the case that you need a little bit of manual attention to squeeze in the last little bit of charge......or disconnect all of the loads so that the float will actually top off the charge a bit over a long period.
You don't have a long period so you are back to a certain degree of manual control.
I think that you would be wasting time and money by buying new equipment in trying to get that last 3-5% when you have already discovered how to do it with a TINY little bit of manual effort.
But that opinion probably won't deter you from your obsession.