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12V and 120V power

Two systems: 12 volts from the battery for lights, the pump and controls, and 120 volts from the pedestal, generator or inverter for outlets, the AC and the microwave (RV electrical basics). Find which side went dead first. A 30-amp pedestal gives up to 3,600 watts and a 50-amp one up to 12,000 (30 amp vs 50 amp).

12V DC

Always on while the battery is connected.

  • Lights and fans
  • Water pump
  • Slide motors
  • Furnace and fridge boards
  • Igniters and detectors

120V AC

Only on shore power, a generator or an inverter.

  • Air conditioner
  • Microwave
  • Wall outlets
  • Electric water heater
  • Converter (charges the 12V side)
RV 12-volt fuse panel mounted beside a household-style 120-volt wall outlet Start hereRV electrical in plain wordsWhat 12V and 120V actually run, and where converters and inverters fit7 min read ToolLoad calculator Tick what runs together and see whether the pedestal breaker holds, including the second an AC starts. 30 amp3,600 W50 amp, per leg6,000 W Open the calculator

Hooking up and protecting the rig

What the pedestal delivers, and what stands between it and your appliances.