Class A electrical system setup - no dealer guidance

When you are plugged in to shore power most rigs have a "converter" wired into the system that keeps your batteries charged. When you are using "inverter" for 110v power, you must switch off the "converter" breaker on 110v breaker panel, otherwise you have the "inverter" using up battery power running the "converter" which is a battery charger. Big time loosing proposition. Will run your batteries down very rapidly. Sounds like this is what is happening to you in addition to other things mentioned....