A 30 amp RV generator delivers roughly 3,600 watts at 120V—enough for a fridge, lights, and one A/C, but not everything at once.
The real answer to what a 30 amp generator can run depends on which “30 amp” you mean. An RV-style plug is 120V, so 30 amps equals 3,600 watts (30 × 120). A household 30A circuit wired for 240V can push 7,200 watts maximum, but that’s a different setup entirely. Most people asking this own an RV.
What a 30A RV Generator Can Power At Once
You have roughly 3,600 running watts to spend. A typical RV refrigerator uses 150–600W, LED lighting about 50W total, and a TV with a laptop charger adds another 150W. That leaves plenty of room.
The loads that demand respect are motor-driven ones—they draw several times their running wattage just to start. Here’s what usually fits on a 30A RV circuit versus what pushes it over the edge.
- Comfortable: refrigerator, lights, TV, phone and laptop chargers, internet gear, small fans, coffee maker, toaster, and most microwave ovens.
- Conditionally possible: one 13.5K or 15K BTU roof air conditioner—so long as no other heavy load is running when the compressor kicks on.
- Too much together: A/C plus the electric water heater, A/C plus a space heater, or microwave plus a toaster on the same circuit.
Why Startup Surge Determines What You Can Run
Motors need a big jolt of power to get moving. A roof A/C that runs at 1,500W can demand 3,000W or more for a few seconds at startup. The same applies to your refrigerator’s compressor and any water pump.
If that spike exceeds the generator’s output, the overload protection trips and everything cuts out. The fix is simple: never plan loads against running watts alone. Always leave surge headroom.
Picking The Right Generator Size
Because startup surge matters more than any single number, the reliable rule for a 30-amp RV is to buy more than 3,600W.
- Add the running watts of everything you want on at the same time.
- Add 20–30% for startup surge from motors and compressors.
- Compare the total to the generator’s running watts—not its advertised peak output.
- If you have A/C, confirm whether it’s a 13.5K or 15K BTU unit and whether the generator handles its surge.
Need a safe, reliable cord to connect that generator to your RV? Our tested roundup of the best 30 amp cords for generators covers the options that won’t melt under load.
Common Mistakes That Trip Up 30A Owners
The most frequent error is confusing amps with watts. A 30A RV shore power cord is 120V, so you get 3,600W—not the 7,200W you’d see on a 240V household circuit. Generator marketing often lists peak watts as if it were continuous output, which is another trap. Peak is a burst; running watts are what you actually live with.
Finally, don’t assume one 30A setup fits another. A 30A RV plug is 120V-only, while a 30A house inlet might be wired for 240V. Always verify your exact inlet and transfer-switch wiring before you connect anything.
References & Sources
- EcoFlow. “What Size Generator Is Best For a 30 Amp RV?” Provides the 3,600W baseline and real-world generator sizing for 30A RV service.
- Jackery. “30 Amp Generators: What Can They Run?” Details the loads a 30A generator typically supports and the 80% continuous-load rule.
- Electrical Safety Office, Queensland Government. “Powering Appliances With Generators.” Government source for appliance wattage examples and safe generator practices.