Cummins Onan P9500df generatorCheck best price → All photos, customer reviews and today's price →
Remote start · Dual fuel · 7,500 W

Cummins Onan P9500df review: our full analysis

Brand: Cummins · Ranked 88th of 174 · Our methodology

7.1/10 Power8.3 Runtime9.4 Noise4.7 Features6.9 Portability5.9 Watts per dollar6.8 Dotted line: average of the 174 models. Relative scores based on specs, no hands-on testing. Where to buy Today's best priceTypical price: $1,200–$1,800 Check best price Affiliate link: As an Amazon Associate we earn from qualifying purchases.
Key takeaways. The Cummins Onan P9500df pairs a 7,500 W running rating on gasoline with an open-frame design built for raw power, built for home backup through a transfer switch or an interlock kit. It weighs 194.0 lb, is rated at 74 dB(A) and runs about 11 hours at half load on a tank. Notable features: remote start, a 240 V transfer-switch outlet.

Not clearly published by the manufacturer, take with caution: noise level.

Pros

  • 7,500 running watts on gas and 6,750 on propane, switched with one selector.
  • L14-30R 120/240 V outlet, manual transfer switch ready, plus two 5-20R GFCI duplexes.
  • Push-button and remote fob start, 16 hours at 25% load on the 6.6-gallon tank.

Cons

  • 23% THD: not clean enough for sensitive electronics without a UPS.
  • 74 dBA, loud for a campground.
  • 194 lb dry, and no CO shutdown sensor.

Best for

  • Home backup through a transfer switch or an interlock kit

Specifications

TypeDual fuel (open frame)
Running watts7,500 W gasoline · 6,750 W propane
Starting watts9,500 W gasoline · 8,550 W propane
FuelGasoline, propane
Fuel tank6.6 gal
Runtime16 hours at 25% load · 11 hours at 50% load
Noise74 dB(A) (manufacturer figure)
Weight194.0 lb
Outlets4 × 120 V household outlets (5-20R) · L14-30R 30 A 120/240 V twist-lock · USB ports
Transfer switch readyYes
StartRemote key fob + electric push-button + recoil
CO shutoff sensorNot listed
Parallel capableNo
EmissionsCARB and EPA compliant
Engine420 cc
Warranty3 years
Cummins Onan P9500df7,500 running W · Dual fuel · typical price $1,200–$1,800 Check price and availability

Who is it for?

The Cummins Onan P9500df is mostly suited to:

  • Home backup through a transfer switch or an interlock kit.
1

What will a 9,500-watt generator run?

The Cummins Onan P9500df delivers 7,500 W continuously and up to 9,500 W for a few seconds to start motors on gasoline. On propane, the manufacturer rates it at 6,750 running watts (8,550 W starting), 10% less. It handles 14 of the 14 loads on our typical list one at a time; add up the running watts of everything you run together, plus the extra starting watts of the biggest motor.

ApplianceRunning / starting wattsWill it run?
Wi-Fi router and modem20 W / 20 W✅ Yes
CPAP (no humidifier)50 W / 50 W✅ Yes
Laptop or TV150 W / 150 W✅ Yes
Full-size refrigerator700 W / 2,200 W✅ Yes
Chest freezer500 W / 1,500 W✅ Yes
Furnace blower (1/2 HP)800 W / 2,350 W✅ Yes
Sump pump (1/2 HP)1,050 W / 2,150 W✅ Yes
Microwave (1,000 W)1,000 W / 1,000 W✅ Yes
Space heater1,500 W / 1,500 W✅ Yes
Window AC (10,000 BTU)1,200 W / 3,600 W✅ Yes
RV roof AC (13,500 BTU)1,800 W / 2,800 W✅ Yes
Circular saw1,400 W / 2,300 W✅ Yes
Well pump (1 HP, 240 V)1,000 W / 4,000 W✅ Yes
Central AC (3-ton, soft start)3,800 W / 5,500 W✅ Yes

Typical figures; check the label of your own appliances. One load at a time: add up everything you run together.

Cummins Onan P9500df7,500 running W · Dual fuel · typical price $1,200–$1,800 Check best price
2

Fuel tank and runtime

The fuel tank holds 6.6 gallons of gasoline. The manufacturer quotes 16 hours at a quarter load. At half load, it runs about 11 hours on a full tank. That is about 0.60 gallon per hour at half load, or 14 gallons for a full day of running, so plan your fuel storage for a multi-day outage. On propane, a standard 20 lb tank holds about 4.7 gallons of LP; propane does not go stale, which makes it the easiest fuel to stock.

Fuel tank6.6 galgasoline
At 25% load16 hoursmanufacturer figure
At 50% load11 hoursmanufacturer figure
Fuel per day≈ 14 gal24 h at half load
3

74 dB(A): how loud is it?

The manufacturer rates the Cummins Onan P9500df at 74 dB(A), usually measured at 23 feet (7 m) and a light load. That is loud, like a lawn mower: place it as far from the house and the neighbors as the cords allow.

4

Outlets and home connection

Its panel offers 4 × 120 V household outlets (5-20R), L14-30R 30 A 120/240 V twist-lock, USB ports. The L14-30R outlet supplies 120/240 V, which is what a manual transfer switch or an interlock kit with a power inlet box connects to, installed by a licensed electrician. Never backfeed the house through a wall outlet.

5

Start type, CO shutoff and warranty

It starts with a remote key fob or the electric push-button, with a recoil cord as backup. The manufacturer does not list a CO shutoff sensor: be strict about placement, 20 feet from the house with the exhaust pointed away. It is listed as CARB compliant, so it can be sold in California. The warranty runs 3 years (residential use).

6

Typical price $1,200–$1,800: good value per watt?

Relative to its running watts, the Cummins Onan P9500df scores 6.8/10 on value: an average result. Generator prices on Amazon move a lot, especially before hurricane season: check the current price before you buy.

Cummins Onan P9500df7,500 running W · Dual fuel · typical price $1,200–$1,800 Check best price

Our verdict on the Cummins Onan P9500df

The Cummins Onan P9500df scores 7.1/10 and ranks 88th out of 174 generators analyzed. Its strengths: 7,500 running watts on gas and 6,750 on propane, switched with one selector; L14-30R 120/240 V outlet, manual transfer switch ready, plus two 5-20R GFCI duplexes. It is best suited to home backup through a transfer switch or an interlock kit.

Cummins Onan P9500df7,500 running W · Dual fuel · typical price $1,200–$1,800 Check best price

Featured in our rankings

Best dual fuel generators56th of 80Best portable generator for home backup60th of 68Best generator for a well pump56th of 62Best generator for construction and jobsites40th of 51Best generator with remote start42nd of 52Best generator with electric start68th of 92Best 9500 watt generator and up47th of 50Best generator under $1,50065th of 142

Sources

Frequently asked questions

Will the Cummins Onan P9500df run a refrigerator?

Yes: its 7,500 running watts and 9,500 starting watts cover a full-size fridge, including the compressor's startup surge.

Can the Cummins Onan P9500df power a house?

It can back up the essentials through a transfer switch or interlock kit connected to its L14-30R outlet.

How long does the Cummins Onan P9500df run on a tank?

About 11 hours at half load according to the manufacturer, and 16 hours at a quarter load.

Does the Cummins Onan P9500df run on propane?

Yes, it is dual fuel: 6,750 running watts on propane.

Is the Cummins Onan P9500df quiet?

The manufacturer rates it at 74 dB(A), typical of an open-frame generator: not campground-quiet.

Cummins Onan P9500df7,500 running W · Dual fuel · typical price $1,200–$1,800 Check best price

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