Compare Generators Side-by-Side

Generator

Generator

5000 W

211.6 lbs

14.4 h

14 h

120/240

120/240

420 cc OHV 4-stroke

223 cc OHV 4-stroke, cast iron sleeve

Recoil, Electric, Remote

Recoil, Electric

3 years

3 years

9500 W

5000 W

14.4 h

6750 W

3600 W

9 h

4000 W

CARB, EPA, ANSI/PGMA G300-2023

CARB, EPA, ANSI/PGMA G300-2023

840876140734

7500

4000

3200

8550

4500

9.6

14

14.4

2x Duplex 120V 20A (5-20R) GFCI; 1x 120/240V 30A (L14-30R)

1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R)

60

60

OHV 4-stroke

223 cc OHV 4-stroke

cast iron

14.4

9

Low oil and overload protection

Low oil and overload protection, CO monitoring

Yes

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

Oil, funnel, tool kit, propane hose, RV adapter, cover, battery, and wheel kit

3

3

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 T04073 is a 4,000-watt tri-fuel generator that runs on gasoline, propane, or natural gas. On gasoline, it delivers 5,000 starting watts and 4,000 running watts, enough to power a refrigerator, microwave, and multiple household circuits simultaneously. On propane, output drops to 3,600 running watts, and on natural gas it falls to 3,200 running watts. This fuel flexibility means users can switch between sources based on availability and cost, a significant advantage during extended outages or in remote locations where one fuel type may be scarce. The T04073 targets homeowners, RV owners, and job site operators who need reliable backup power without the commitment to a single fuel source. Its 5-gallon tank runs for 14 hours at 25% load on gasoline, translating to roughly one week of emergency backup if you run it a few hours per day. The unit includes a wheel kit, making it easier to position despite its 123.4-pound weight.