Onan generator high-altitude derating and fewer appliances
Cummins Onan quick-start and handbook guidance warn that available generator power drops about 3.5 percent per 1000 feet of altitude, so high-elevation trips may require fewer simultaneous appliances.
Owner-safe checklist
- Estimate campsite elevation before blaming a generator fault.
- Reduce load by turning off air conditioning, electric heat, or other heavy appliances one at a time.
- Let the generator stabilize after each load change.
- Call Cummins Onan or qualified generator service if the generator still surges, stalls, or faults under a light load.