Onan QG 4000/5500/7000 load rating and model-spec service prep
Use the QG 4000, QG 5500, QG 7000/6500, and QG 7000i DF spec sheets with Cummins power-basics guidance to compare rated watts, fuel variant, altitude or temperature derating, and expected appliance loads before service.
Owner-safe checklist
- Record exact model/spec, fuel type, rated watts, ambient temperature, elevation, and connected appliances before the service call.
- Turn off air conditioners, electric heat, and other large loads, then compare owner-visible load behavior against the generator rating.
- If a generator trips, stalls, or faults under a light load, leave it off and call qualified generator service.
- Use the spec sheets only for model and load expectations; do not treat them as a repair procedure.