RV refrigerators can seem complicated, most run on either liquid propane or AC electricity. But some run on DC power too also known as your battery. Most motorhome and travel trailer fridges are absorption vs compression but compression fridges can run on either AC or DC power with the help of an inverter. Learn how long your fridge can run on battery power alone and if you really need your battery to run your 2-way or 3-way camper fridge.