Quick Answer (BLUF): A 30-amp RV system uses a 3-prong TT-30R connector running on a single 120V leg, providing up to 3,600 watts of continuous power (enough for one rooftop RV air conditioner). A 50 amp generator or shore power hookup uses a 4-prong NEMA 14-50 connector delivering two 120V legs (50A each at 120V/240V), supplying up to 12,000 watts for large fifth-wheels running dual A/C units.
1. 30 Amp (TT-30R) vs. 50 Amp (NEMA 14-50): Electrical Specifications
Many new RVers believe a 50-amp hookup provides only slightly more power than 30 amps. In fact, a 50-amp RV circuit provides more than three times the total wattage because it utilizes two separate 50-amp, 120-volt hot legs:
| Specification | 30 Amp RV System (TT-30P/R) | 50 Amp RV System (NEMA 14-50P/R) |
|---|---|---|
| Prong Configuration | 3-Prong (1 Hot, 1 Neutral, 1 Ground) | 4-Prong (2 Hot Legs, 1 Neutral, 1 Ground) |
| Voltage Rating | 120V Single-Phase | 120V / 240V Split-Phase |
| Max Continuous Wattage | 3,600 Watts (30A × 120V) | 12,000 Watts (2 × 50A × 120V) |
| Supported Appliances | 1 Rooftop AC + RV Fridge + Lights | 2–3 Rooftop ACs + Microwave + Washer |
2. BTU to Watts: Can a Portable Power Station Run an RV Air Conditioner?
Whether you use a gas unit or a quiet battery station (see our Inverter Generator vs. Portable Power Station Guide), the biggest load in an RV is the rooftop air conditioner:
- 13,500 BTU Rooftop AC: ~1,200 to 1,450 running watts, but requires a 2,800W–3,400W starting surge (drops to ~1,800W with a Soft Start kit).
- 15,000 BTU Rooftop AC: ~1,500 to 1,700 running watts and up to 3,600W starting surge.
3. Charging RV Batteries & Using Dogbone Adapters Safely
If your RV has a 50-amp NEMA 14-50 inlet, you can easily connect it to a 30-amp portable power station using a “Dogbone” step-down adapter. This bridges both hot legs inside your RV breaker panel, letting you run your 12V lights, Starlink, and refrigerator safely without tripping breakers.
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