RV Generator Performance at High Elevation: What Changes Above 3,000 ft?
RV generators lose power as altitude increases because thin air reduces engine efficiency. Understanding derating helps you choose the right generator and plan loads for mountain travel.
Why Elevation Reduces Generator Power
Engines rely on oxygen to burn fuel. At higher elevation, lower air density limits combustion, reducing power output even when fuel supply increases.
Most generators lose about three percent of output per one thousand feet above sea level.
Typical Power Loss by Elevation
- 3,000 ft: about 9 percent power loss
- 5,000 ft: about 15 percent loss
- 7,000 ft: about 21 percent loss
- 9,000 ft: about 27 percent loss
A generator rated for 4500 watts may produce only 3300–3600 watts at high-elevation campsites.
How Altitude Affects RV Air Conditioners
Air conditioners require high starting wattage. At altitude, a generator may not provide enough surge to start the compressor, even if it works normally at sea level.
A soft start module helps reduce the starting surge and improve reliability.
Fuel Type and High-Altitude Performance
Gasoline usually performs slightly better than propane at elevation because propane already has lower energy density. Dual-fuel RV owners may see improved AC performance using gasoline above 5,000 ft.
Load Management for Mountain Campsites
- Limit heavy appliance use when running the AC.
- Turn off water heaters and microwaves during compressor cycles.
- Charge batteries during cooler daytime hours.
Maintenance Tips for High Elevation
- Check air filters more often due to dust and dry conditions.
- Use fresh fuel to improve starting.
- Avoid running the generator at maximum load for long periods.
Conclusion
High elevation affects generator output, starting capacity, and AC performance. With proper load planning and understanding of derating, your RV generator remains reliable even at mountain campsites.