What Size Generator for RV?
RV generators need to handle air conditioning, which is the biggest power draw. A 3000W generator covers most RVs, while 4000W+ handles larger units with multiple ACs or heavy use.
Minimum Size
2000W
bare minimum, tight
Comfortable Size
3500W
recommended
Ideal Size
4000W
room to grow
Total Running Watts
2650W
Total Surge/Starting Watts
5200W
Generator Sizing Calculator
Additional Custom Load
Running Watts
2650W
Surge Watts
5000W
Recommended Generator
6500W+
Includes 25% headroom for reliable operation
Suitable Generator Sizes
Estimated Fuel Usage
* Fuel estimates are approximate. Actual consumption varies by generator model, load, and altitude.
Typical Loads for RV
| Item | Running Watts | Surge Watts |
|---|---|---|
| RV Air Conditioner (13,500 BTU) | 1200W | 2800W |
| Microwave | 1000W | 1500W |
| Refrigerator | 150W | 400W |
| TV + Entertainment | 200W | 200W |
| Lights + Charging | 100W | 100W |
| Total | 2650W | 5200W |
* Surge watts apply to motor loads during startup. Size your generator for worst-case surge scenario.
Generator Sizing Tips
- •A soft-start device on the AC reduces surge by 60-70%, allowing smaller generators
- •Inverter generators are quieter and better for campground etiquette
- •Dual-fuel (gas + propane) provides fuel flexibility
- •Consider running AC and microwave at different times to reduce peak load
- •A 30A RV can use up to 3600W; 50A can use 12,000W across two legs
Key Considerations
- ⚠Campground noise restrictions may require inverter generator
- ⚠Altitude reduces generator output by about 3% per 1000 feet
- ⚠Hot weather increases AC runtime and power consumption
Alternatives to Consider
- ✓Solar + battery for boondocking without generator noise
- ✓Soft-start to use smaller/quieter generator
- ✓Shore power when available
Frequently Asked Questions
What size generator for a 30 amp RV?
A 3000W generator handles most 30A RV needs including AC. For comfort and headroom, a 3500W is ideal. With a soft-start on the AC, even a 2000W works for basic needs.
Can a 2000W generator run an RV air conditioner?
Only with a soft-start device installed. The AC surge of 2800W exceeds 2000W capacity. With a soft-start, the surge drops to under 1000W, making it possible.
Inverter vs conventional generator for RV?
Inverter generators are quieter (50-60 dB vs 70+ dB), produce cleaner power for electronics, and are more fuel-efficient at partial load. They cost more but are worth it for RV use.