WGen9500DFc on Gasoline vs Propane: How Much Power Do You Lose?
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Short answer: Westinghouse rates the WGen9500DFc at 9,500 running / 12,500 peak watts on gasoline and 8,500 running / 11,200 peak watts on propane.
How big is the propane reduction?
The published continuous-power difference is 1,000 watts. That is about a 10.5% reduction from the gasoline running-watt rating. Peak capacity drops by 1,300 watts.
When does that difference actually matter?
If your outage plan is comfortably below 8,500 running watts and below the propane peak rating, the lower propane number may not change what you can run. It matters when your load plan is already close to the generator’s limits or includes a large motor/compressor startup.
Which number should you use in a calculator?
Size from the fuel you actually intend to use. If you expect propane to be your normal outage fuel, use 8,500 running and 11,200 peak as the ceiling rather than sizing from the larger gasoline figures.
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Sources and method
Generator ratings and outlet specifications come from Westinghouse’s published WGen9500DFc specifications. Appliance examples use the same planning values and largest-startup-surge method explained in the SizeDial Generator Wattage Calculator. Actual appliance nameplates override generic estimates.