Outlets, battery charger, air conditioning, & electric stove all run on 120VAC. Everything else runs on 12VDC. Fridge is dual voltage and should default of 120VAC if present, or step down to 12VDC if not.
Battery isolater switch (1-2-Both-Off) only controls 12VDC. Breaker panel controls 120VDC. The main plus the individual breakers need to be on for each circuit you are using.