Running an RV Air Conditioner With a Generator: What You Need to Know
RV air conditioners draw more power than almost any other appliance. Using a generator to run your AC requires the right wattage, fuel plan, and load management.
RV AC Starting and Running Watts
Most RV AC units require a short burst of power to start the compressor, followed by a lower running load. Generators must handle both the surge and the continuous demand.
- 13,500 BTU AC: 1,600–2,200 starting watts, 1,100–1,500 running watts
- 15,000 BTU AC: 1,800–2,300 starting watts, 1,300–1,800 running watts
Starting wattage is the critical factor. If the generator cannot meet the surge, the AC will not cycle on.
Best Generator Sizes for RV AC
Most RV owners choose generators in the 3500–4500 watt range for reliable AC operation. These sizes provide enough surge capacity even in hot weather.
- 2000–2400W inverter: light loads only, rarely enough for AC
- 3500–4500W inverter: works for most AC units with smart load management
- 5000W+ inverter: ideal for multi-appliance use
Using a Soft Start Device
Soft start modules reduce compressor surge by up to 40 percent. With one installed, some AC units can start on smaller generators.
- Fewer overload shutdowns
- Smoother cycling during high heat
- Better performance at altitude
Operating During High Temperatures
Air conditioners draw more power on hot days. Running an AC in 95°F or higher conditions increases starting load and reduces generator efficiency.
Allow extra headroom by choosing a generator larger than your minimum estimate.
Managing Other RV Loads
To prevent overload, turn off other high-draw appliances during AC operation. This includes microwaves, water heaters, and hair dryers.
- Run AC alone during compressor start
- Add small loads once running watts stabilize
- Use eco mode only when AC is not cycling
Fuel Planning for AC Use
Running an AC significantly reduces runtime. Expect shorter operating hours compared to light loads.
- Use eco mode when AC is off
- Refuel during cooler parts of the day
- Consider dual-fuel options for longer stays
Conclusion
Running an RV air conditioner with a generator is simple with proper wattage and load management. Choose a generator with adequate surge capacity, consider a soft start device, and plan fuel use for reliable cooling all day.