Compare Generators Side-by-Side

Generator

Generator

4550 W

211.6 lbs

14.4 h

120/240

120V 60 Hz

420 cc OHV 4-stroke

208 cc OHV 4-stroke, cast iron sleeve

Recoil, Electric, Remote

Recoil

3 years

3 years

9500 W

4550 W

14.4 h

6750 W

3300 W

CARB, EPA, ANSI/PGMA G300-2023

EPA, ANSI/PGMA G300-2023

840876136553

7500

3650

9500

4550

9.6

14

10.8

60

60

OHV 4-stroke

208 cc OHV 4-stroke, cast iron sleeve

cast iron sleeve

14.4

Low oil and overload protection

Low oil and overload protection

Yes

Oil, funnel, tool kit, key fob, propane hose, battery, and wheel kit

Oil, funnel, tool kit, propane hose, and wheel kit

3

A075C509

The Cummins Onan P9500DF EFI is a 7,500-watt dual-fuel generator built for users who need sustained power across multiple load types. On gasoline, it delivers 7,500 running watts and 9,500 peak watts. On propane, it drops to 6,750 running watts and 8,550 peak watts, which means propane users sacrifice roughly 10 percent of output but gain extended storage life and cleaner emissions. The electronic fuel injection engine handles high-altitude operation up to 13,123 feet without modification, making it viable for mountain jobsites, remote cabins, and RV camps where carbureted engines would struggle. At 211.6 pounds with an included wheel kit, this generator demands stationary placement or two-person handling, but the 6.6-gallon fuel tank stretches runtime to 14.4 hours at 25 percent load on gasoline. This is a workhorse for contractors, emergency backup, and off-grid scenarios where fuel flexibility and durability matter more than portability.

The Firman H03655 is a 3,650-watt dual-fuel generator built around a 208 cc OHV 4-stroke engine with a cast iron sleeve. Running on gasoline, it delivers 4,550 starting watts and 3,650 running watts. Switch to propane and output drops to 4,100 starting watts and 3,300 running watts. This power level runs a refrigerator, microwave, window air conditioner, or multiple power tools simultaneously. The dual-fuel flexibility means you can operate on whichever fuel is available, a practical advantage during extended outages or when propane storage is more convenient than gasoline. At 67 dB at quarter load, the H03655 operates quietly enough for residential neighborhoods without disturbing neighbors. The 5-gallon tank delivers 14 hours of runtime at 50 percent load on gasoline, translating to roughly one full day of moderate use before refueling. The RV-ready configuration and included wheel kit position this unit as a go-anywhere power source for camping, job sites, and home backup scenarios.