People often add to a conversation without having background with the specific components a person is having the problem with - and make a lot of assumptions.
For clarity - this specific nature power inverter/charger model has a built in transfer switch. I just installed mine and I'm having an issue with it also.
This unit is basically put in-line in an AC circuit. When the circuit gets external power (shore power or generator power) it turns on the built in charger and passes AC power through the unit to the downstream part of the circuit.
Mine will activate the charger when connected to city power, or my Honda eu2000i generator. It is flaky at best when my onan marquis gold 5500 watt generator is the external power source. It seems that if I turn on one of my overhead AC units the inverter/charger will start charging and passing current through. Also if the electric water heater is on and drawing power - the inverters transferswitch activates and the charger starts running. The remote display will indicate charging. If the overhead AC is not on, the inverter charger remains in INVERTER mode and keeps draining the batteries. (but it isn't charging them so that suckx) It doesn't seem to sense power from the onan generator properly and thus the built in transfer switch seems not to be functioning.
If someone finds a solution I'd like to hear it. Camping world didn't know ahead of time to warn me of such a possibility but with new gear coming out all the time I can't really blame them.
I'm considering a separate transfer switch and inverter and charger at this point. What a pain in the butt. I've got several hours routing that dang remote cable through the coach.
