Ever wonder how RV travelers access their basic utilities while traveling on the road or even more so off grid away from society? Whether running an Air Conditioning, cooking or taking showers, it will require power (and water). Some RV's have basic power sources like the battery and. Typically, an RV has two different electrical systems each separate from one another, a Direct Current (DC) system of 12-volt, and an Alternating Current (AC) system of 120-volt. When you connect your RV to an on-grid dedicated AC power supply, you are connecting to a power supply of either 30 or 50 amps. Once. Exact power amounts will vary from RV to RV as they depend on the appliances that are being used and the size of the units. You should take into consideration how each appliance can.