Are you plugged into shore power?
Does any of the 120 volt items work? Microwave?
The battery disconnect would/should have no effect if plugged in.
Starting and running genset should provide power to the converter or inverter charger. This would have same effect as shore power as the automatic transfer switch should change the 120/240 source.
You may have tripped a 120 volt system circuit breaker not allowing power to the converter or inverter charger. Try resetting all the 120 volt circuit breakers. Turn them all off, applying light pressure toward off, then turn on main breaker, followed by branch breakers one at a time.