Compare Generators Side-by-Side

Generator

Generator

6850 W

194 lbs

16 h

14.5 h

120/240

120/240

420 cc Ducar OHV 4-stroke

322 cc OHV 4-stroke, cast iron sleeve.

Recoil, Electric, Remote

Recoil, Electric

3 years

3 years

9500 W

6850 W

16 h

14.5 h

6750 W

5000 W

5500 W

EPA

EPA, ANSI/PGMA G300-2023

690781007932

840876155714

7500

5500

4500

8550

6250

11

8

9.5

60

60

Ducar OHV 4-stroke

OHV 4-stroke

cast iron sleeve

16

14.5

Low oil and overload protection

Low oil and overload protection, CO monitoring

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

3

3

The Cummins Onan P9500df is a 7500-watt dual-fuel generator built for users who need sustained power across multiple scenarios. Running on either gasoline or propane, it delivers 9500 peak watts, enough to start large air conditioning units or power multiple job site tools simultaneously. The dual-fuel architecture means users can switch between fuel sources based on availability and storage constraints. Propane tanks store longer without degradation, while gasoline offers wider accessibility. This flexibility makes the unit valuable for both seasonal backup power and year-round work environments. The 194-pound weight and 27.3 x 26.3 x 26.3 inch footprint define this as a semi-portable unit. The included wheel kit enables movement across job sites or between storage locations, but this is not a grab-and-go machine. Users planning frequent relocation should factor in the logistical demands. The three-year commercial warranty covers manufacturing defects, giving buyers defined ownership support across the critical early-use period.

The Firman WT05571 is a 5,500-watt tri-fuel generator that runs on gasoline, propane, or natural gas. On gasoline, it delivers 6,850 starting watts and 5,500 running watts, enough to power a full home electrical panel during an outage or run multiple job site tools simultaneously. On propane, output drops to 6,250 starting and 5,000 running watts. On natural gas, it falls to 5,500 starting and 4,500 running watts. This fuel flexibility means users can switch between sources based on availability, cost, or storage preference without buying multiple generators. The tri-fuel capability makes this unit valuable for homeowners in regions with natural gas infrastructure, RV owners who can refill propane at any campground, and contractors who need to adapt to job site fuel availability. The 3 percent THD rating protects laptops, televisions, and other sensitive electronics from voltage spikes that damage circuits. At 67 decibels, the noise level sits between a typical conversation and heavy traffic, making it suitable for residential neighborhoods but audible enough that neighbors will know it is running.