Cummins Onan P9500df - 7500/9500W Dual Fuel Generator

The Cummins Onan P9500df is a portable open frame dual fuel generator with a rated wattage of 7500 W and a starting wattage of 9500 W.

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Picture of the Cummins Onan P9500df
Note: This unit is a rebranded version of the Westinghouse WGen7500DF.
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In a nutshell, the Cummins Onan P9500df is a portable generator mostly geared towards:

  • Food truck owners who want to ensure that their business is fully self-contained and does not rely on potentially unreliable external power
  • Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • Professionals in need of safely powering high-intensity work or lighting equipment

In the following paragraphs, we shall explore the power characteristics, available outlets, portability, and any additional features of the device, along with its emission compliance information.

Power & Run Time

The Cummins Onan P9500df in use

The Cummins Onan P9500df

The dual-fuel technology of the Cummins Onan P9500df allows for an output of 120/240V and provides superb power and versatility. If gasoline-powered, the device provides a running wattage of 7500W and a starting wattage of 9500W. If propane-powered, it gives 6750 rated watts and 8550 starting watts.

At a noise rating of 74 dBA (just slightly more noisy than a shower), this generator can be started via a conventional pull-start mechanism, or a simple and elegant electric starter (battery included). To add further convenience, the Onan P9500df can be remotely started (key fob included).

As for its running time, the Onan P9500df, along with its 6.6 gallons fuel capacity, can run for up to 16 hours with a full tank filled with gasoline (fuel consumption around 0.6 GPH). If propane is used, it can operate for up to 8 hours (on a 20 lbs tank - propane consumption around 0.59 GPH).

Since the Onan P9500df has a somewhat high THD (<23%), it is advisable to not use it for the powering of sensitive electronic devices.


The control panel includes the following 5 AC outlets:

Two Duplexes 120V 20A (5-20R) GFCI
120/240V 30A (L14-30R) receptacle

As the Onan P9500df holds a twist-lock L14-30R receptacle, it is transfer switch ready: you'll easily be able to connect it to your breaker box to power your home during a power outage.

Cummins' Smart Switch Outlet

Picture of Westinghouse ST Switch outlet

The Onan P9500df has an identical outlet, but with a different name

The Onan P9500df features a special outlet that allows an automatic power transfer in case of a power outage.

To benefit from this feature, you'll need Cummins' Automatic Transfer Switch, which is not included with the generator.

As mentioned further up, since this unit is simply a Westinghouse generator in disguise, you can absolutely use the Westinghouse ST Switch (opens in a new tab) instead. It serves the exact same purpose.

Simply put, the ST Switch is a cost-effective and versatile portable automatic transfer switch, which can be installed quickly and easily, without the assistance of an electrician.

Plug the ST Switch into one of your household 120V outlets, plug your appliances to the ST Switch, and connect the Onan P9500df to the ST Switch via the special outlet and a 120V cord. The generator will automatically turn on when the power goes out, and automatically turn off when the power returns.


The Cummins Onan P9500df has the following dimensions: L27.3 x W26.3 x H26.3 in. In combination with its conventional, open frame design, they provide support and allow the generator to be raised above ground level. The device has been designed for tough environments and demanding outdoor use.

As the generator's weight is 194 pounds, manually moving it or transporting it may be challenging, despite the fact that it is technically considered 'portable' (movable). Nevertheless, it can still be moved quite conveniently with the help of its wheel kit (⌀10") and its folding handle, once it is placed on the ground.


Panel of the Cummins Onan P9500df

The Onan P9500df's control panel

The Onan P9500df's control center features a convenient meter, which displays voltage, frequency and lifetime hours to aid you with the monitoring of its status and activity.

A built-in fuel gauge allows for a quick, easy and convenient check of the fuel level of the generator.

As for its security measures, the device features an overload protection (circuit breaker) and an automatic low oil shut-off, letting you use it with a peace of mind.

Along the basic documentation and an owner's manual (opens in a new tab), useful for starting the generator right away, the Cummins Onan P9500df's package also includes these accessories: oil, battery charger, funnel, propane hose, tool kit and key fob.


The Cummins Onan P9500df is EPA-approved and CARB-compliant. It can therefore be sold and purchased in all 50 states, including California.

Moreover, it features a spark arrestor, making it usable in forested areas.

Product Video

The Cummins Onan P9500df versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Cummins Onan P9500df compare to dual fuel generators of similar power (between 7000 and 8000 W).

  • At a weight of 194 pounds, the Cummins Onan P9500df places in the expected weight range of the dual fuel generators in the 7000-8000 rated wattage range. If weight is your top priority, one of the champions in this power category is the Sportsman GEN85KIDF, weighing just 133 pounds.
  • This generator has a somewhat average expected noise for its type and power range, rated at 74 dBA. If noise emissions are important to you, one of the least noisy generators of this power range is the Genmax GM9000iED with only 62 dBA.
  • As the Onan P9500df offers around 11 hours run time on a full tank at a 50% load, it falls within the average autonomy range among the dual fuel generators of a similar power. If autonomy is your priority, one of the devices of a similar power output with the highest run time is the Firman H07552, reaching around 12 hours.
  • Even though run times are undoubtedly important, they are dependent on the fuel capacity to a large extent. For a more wholesome picture, we must take into consideration the fuel consumption of the generator. With an estimated gasoline consumption of 0.6 GPH (gallon per hour) at 50% load, this generator is among the more fuel efficient of the products in the above-mentioned wattage range. If you wish to further improve in the area of fuel efficiency, the Pulsar PG10000B16, which boasts with a gas consumption of only 0.55 GPH, may be the right generator for you.

Price comparison

As you can see from this interactive chart, when compared to other 7000-8000W dual fuel generators, the Cummins Onan P9500df is on the average side of the price range.

Therefore, this generator nicely fits in the expected budget for this kind of product.

The bottom line

  • In the expected price range
  • Several accessories included
  • GFCI Outlets
  • Remote start
  • Dual Fuel
  • Compatible with Westinghouse ST Switch
  • Fuel efficient
  • Decent weight (194 lbs)
  • Acceptable noise (74 dBA)
  • Decent run time
  • No 50-amp output

Do you own the Cummins Onan P9500df and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

Parallel capableNo
RV readyNo
FuelDual Fuel (gasoline/propane)
Engine420 cc Ducar OHV 4-stroke
Starting systemRecoil, Electric, Remote
VoltageAC: 120/240V 60 Hz
Running watts7500 W6750 W
Starting watts9500 W8550 W
Running amps (@120/240V)62.5/31.3 amps56.3/28.1 amps
Peak amps (@120/240V)79.2/39.6 amps71.3/35.6 amps
Run time @50% load11 hUnknown
Run time @25% load16 h8 h
GFCI outletsYes
Covered outletsYes
Automatic Voltage RegulationYes
AC outlets
  • 2x Duplex 120V 20A (5-20R) GFCI
  • 1x 120/240V 30A (L14-30R)
DC outletsNo
Data centerVFT
Fuel tankSteel, 6.6 gal
Fuel gaugeYes
Weight194 lbs
Approx. dimensions (L x W x H)27.3 x 26.3 x 26.3 in
Noise (lower limit)74 dBA
THD< 23%
ComplianceCARB, EPA
SecurityLow oil and overload protection
Spark arrestorYes
NeutralBonded to frame
Accessories includedOil, funnel, tool kit, key fob, battery charger, propane hose, battery, and wheel kit
Warranty3 years
Other model numbersA058U967

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.


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About Cummins

Cummins is a NYSE publicly traded, Fortune 500 corporation dealing in the power sector and heavy industry. Founded in 1919 in Columbus, IN, by William Glanton Irwin and Clessie Cummings, Cummins focused on the development of diesel engines. However, the company truly came to bloom only after the WWII, with the nationwide road expansion and went finally global in the 1960s, with its heavy-duty trucks. Cummins has, over the years, offered a wide variety of power solutions, from actual power plants to RV generators. Yet, the company has only recently dipped its foot into the portable generator market. The company currently offers a small selection of both conventional and inverter generators under the Onan product line, formerly the Cummins Onan brand.

Warranty Information

The Cummins Onan P9500df is covered under a warranty for up to 3 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Cummins generators, please contact the Cummins Customer Support: 1-800-CUMMINS (800-286-6467).

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator size calculator.
ItemRunning WattsStarting Watts
At homeMicrowave (1000 watts)15001500
Dish washer15003000
Electric fry pan15001500
Sump pump (1/2 hp)10502150
Refrigerator (energy star)1921192
Satelite receiver250250
Total5992 W7492 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Hair dryer18001900
Electric grill16501650
Radiant heater13001300
Set of 5 LED light bulbs5555
Total5995 W6585 W
For workTable saw18004500
Air compressor (1 hp)16006100
Bug zapper8080
Total4880 W9380 W

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Cummins Onan P9500df
2.8 Total Score
6 reviews
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User Reviews

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  1. 0.5

    At 25 hours Stepper motor failed. Unit wouldn’t start! At 381 hours took unit to Cummins in Green Bay, Wisconsin. Tech found a valve spring was broken and keeper nuts had severed and scarred piston and cylinder walls! Took Cummins a day and a half to get approval to replace this generator! I had to wait 2.5 more weeks for my replacement to arrive at Cummins in Green Bay! I made two round trips to Green Bay Cummins and then had to drive to Saukville, Wisconsin to deliver this generator back to Camping World for my refund. Neither company [Cummins or Camping World] even remotely offered to reimburse me for my diesel fuel ⛽️!! Heartless companies selling absolute junk generators!!!

    + PROS:
    - CONS:
    • At 25 hours Stepper motor was defective. Generator wouldn’t start! At 381 hours less than 90 days old valve spring broke and keeper nuts went into engine and scarred piston and cylinder walls!
    • They got me a brand new one and I was without power for three weeks! And I had to drive to Cummins in Green Bay twice round trip and then drive all the way to Saukville, Wisconsin to return unopened generator to get my money back from Camping World!! Neither company even remotely offered to reimburse me for my diesel. Another junk generator!! MIDWEST EQUIPMENT SALES out of Columbus, OH makes these and Westinghouse generators!! Absolute garbage generators!!!
    Helpful(0) Unhelpful(1)You have already voted this
  2. Avatar
    Calvin Weimer May 23, 2022 at 8:12 am

    I got one brand new and after26 hrs run time the engine lost compression I’m out 1100.bucks and I’m pissed off the place I bought it won’t refund the money and I’m powerless in se alaska in my mortorhome

    + PROS:
    • None
    - CONS:
    • Discusted
    Helpful(0) Unhelpful(0)You have already voted this
  3. 0.65

    I bought a Onan 9500 from a solar supply guy and it has leaked propane from Day ONE. I have called Cummins and they said they would have a tech contact me and it never happened. never ever heard back. This winter it was leaking liquid propane onto the floor of my gen Shed and it caught on fire. Luckily i was in the shed when it happened and put it out immediately before any real damage.

    The Solar dealer has been trying to get warranty sorted out since early February with no luck.

    He had sold several of these to customers and all with the same issue. He has a garage full of Onan 9500 that all leak propane thru the carb and customers are fed up. Save your money. I thought I was getting a quality unit when I bought a Cummins product but did I ever get fooled.

    + PROS:
    • Worked good on Auto start and remote start
    - CONS:
    • Leaks propane profusely
    Helpful(0) Unhelpful(0)You have already voted this
  4. Avatar
    Disappointed shopper October 13, 2021 at 6:49 pm

    This generator is the biggest pile of crap. Has only started maybe 3 times with the push start. It wont start with the pull. When it tries to start with the push start, the battery dies and probably because it tries to start 4 times and fails. When it does start, we were able to power 2 rv AC units. it’s REALLY REALLY LOUD. Do not buy. Unreliable generator.

    + PROS:
    • When it did start, it ran 2 RV AC Units.
    - CONS:
    • Never works
    Helpful(1) Unhelpful(0)You have already voted this
  5. Avatar
    Iron Horse Industries September 12, 2021 at 5:42 pm

    Seemed to work great and powered a 30 gallon 2 stage air compressor well. Next test will be running a Miller 130 wire feed welder.

    + PROS:
    • Cummins Branding
    - CONS:
    • Long run time
    Helpful(2) Unhelpful(1)You have already voted this
  6. 1.15

    I’m working with a customer who bought 2 of the generator from an rv co. Online. Neither one runs. On either fuel. He had trouble getting service from the place he bought them from. I’m an independent repair shop and The parts availability and service very poor. I’m dealing with some kind of factory defect in the timing of the ignition.

    + PROS:
    • Generator won’t start on either fuel
    - CONS:
    • Service sucks
    Helpful(22) Unhelpful(3)You have already voted this

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