DrewE--"It's hard to think of very many circumstances where one would not want it to charge from the engine while underway. "
With AGMs on solar off-grid, they need a proper cycle to true full once home, but that means they need to first be run down to a lower SOC, being near full from all that solar.
Having the alternator charge them up on the way home gets in the way of getting them lower. Heading from home to the off-grid site is ok though. A switch on the alternator to house bank would be handy to have for that.
I gather that Li batts should be floated at some SOC lower than full, so you would not want them too full on arrival home to start a float time.
