There are 2 power systems in RVs:
- 12v system runs off of the batteries; 12v powers things like:
- lights,
- water pump,
- bathroom vents,
- HVAC thermostat,
- furnace brains + blower fan,
- 12v fridge or 2-way fridges,
- slides,
- and electric stabilizers/leveling system
- 120v system comes from the campsite power (or generator or inverters); 120v items are your:
- regular outlets,
- microwave,
- air conditioners,
- residential refrigerators,
- most TVs, etc.
When not connected to shore power, you need to use a generator or inverter to make 120v power.