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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 7,500 W and a starting wattage of 9,500 W.

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Description

Zoom on the Cummins Onan P9500df

In a nutshell, the Cummins Onan P9500df is a portable generator mostly geared towards:

  • Food van owners who know that just a short power outage could lose them hundreds of dollars
  • Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
  • Professionals in need of safely powering high-intensity work or lighting equipment

The following sections will present you in detail its power characteristics, the different outlets it offers, its overall portability, the extra features it benefits from, and any relevant emission compliance details.

Power & Run Time

The Cummins Onan P9500df in use

The Cummins Onan P9500df

With its dual-fuel technology, the powerful and versatile Cummins Onan P9500df provides an output of 120/240V. While gasoline-powered, it gives a running wattage of 7,500W along with a peak wattage of 9,500W. While propane-powered, it provides 6,750 rated watts and 8,550 starting watts.

Enjoying a noise rating of 74 dBA (just slightly more noisy than a shower), this generator can be started thanks to a conventional pull-start mechanism, but also to a convenient and easy-to-use electric starter (battery included). Moreover, to offer you even more convenience, the Onan P9500df can also be remotely started (key fob included).

The running time of the Onan P9500df, with its 6.6 gallons fuel capacity, can reach up to 16 hours on a full tank of gasoline (fuel consumption around 0.6 GPH). With propane, it can reach up to 8 hours (on a 20 lbs tank - propane consumption around 0.59 GPH).

The quite high THD (<23%) of the Onan P9500df makes it unsuitable for powering sensitive electronic devices.

Outlets

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.

Portability

The Cummins Onan P9500df has a conventional, open frame design, of the following dimensions: L27.3 x W26.3 x H26.3 in, which offers support and allows it to be raised above ground level. This type of design is ideal for tough environments and heavy 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). However, its challenging mobility is solved by its wheel kit (⌀10") and its folding handle, which will ease its displacement, once it is on the floor.

Features

Panel of the Cummins Onan P9500df

The Onan P9500df's control panel

To help you monitor the Onan P9500df's status and activity, its control panel is equipped with a convenient meter showing you voltage, frequency and lifetime hours.

The generator includes a built-in fuel gauge, a quick, easy and convenient method of checking the device’s gas level.

As far as security is concerned, the generator can be used with a peace of mind, as it features an automatic low oil shut-off and an overload protection (circuit breaker).

While the standard documentation and an owner's manual (opens in a new tab), helpful for starting the device promptly, come with the Cummins Onan P9500df, the following accessories are also included: propane hose, funnel, oil, tool kit, key fob and battery charger.

Emissions

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 and therefore, can be used 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).

  • With a dry weight of 194 pounds, the Cummins Onan P9500df finds itself in the expected weight range for dual fuel generators able to produce between 7000 and 8000 rated watts. If weight matters to you, one of the champions in this power range is the Sportsman GEN85KIDF with only 133 pounds.
  • This generator, with its lowest possible noise rated at 74 dBA falls into the more noisy category, compared to other devices of a similar running wattage. If noise emissions are one of your priorities, you may be interested in the Genmax GM9000iED, one of the least noisy generators similarly powerful as this one, rated for 62 dBA.
  • Offering around 11 hours of running time on a full tank at 50% load, the Onan P9500df is within the average autonomy range of similarly powerful dual fuel generators. Furthermore, considering the run times, one of the generators which have a roughly same power output, with the highest autonomy, is the Firman H07552, as it provides 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. This generator is one of the more fuel efficient models of the aforementioned output range, as its estimated fuel consumption reaches just 0.6 GPH (gallon per hour) at 50% load. If fuel consumption is your top priority, we suggest to check out the Pulsar PG10000B16, which has a fuel consumption of only 0.55 GPH and thus, is one of the most efficient devices in our database.

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

STRENGTHS:
  • In the expected price range
  • Several accessories included
  • GFCI Outlets
  • Remote start
  • Dual Fuel
  • Compatible with Westinghouse ST Switch
  • Fuel efficient
AVERAGE SPECS:
  • Decent weight (194 lbs)
  • Decent run time
WEAKNESSES:
  • No 50-amp output
  • On the noisy side (74 dBA)

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

General
InverterNo
PortableYes
Parallel capableNo
RV readyNo
FuelDual Fuel (gasoline/propane)
Engine420 cc Ducar OHV 4-stroke
Starting systemRecoil, Electric, Remote
VoltageAC: 120/240V 60 Hz
Power
GasolinePropane
Running watts7,500 W6,750 W
Starting watts9,500 W8,550 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
Features
GFCI outletsYes
Covered outletsYes
Automatic Voltage RegulationYes
AC outlets1x 120/240V 30A (L14-30R)
DC outletsNo
Data centerVFT
IndicatorsNo
Fuel tankSteel, 6.6 gal
Fuel gaugeYes
Misc
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 sizing calculator.
ItemRunning WattsStarting Watts
At homeSump pump (1/2 hp)10502150
Furnace fan (1/2 hp)8752350
Refrigerator (energy star)1921192
Electric range21002100
Electric grill16501650
Radio100100
Total5967 W7442 W
For campingRadiant heater13001300
RV refrigerator180600
Hair dryer18001900
Electric grill16501650
RV AC (11,000 BTU)10101600
Set of 5 LED light bulbs5555
Total5995 W6585 W
For workTable saw18004500
Air compressor (1 hp)16006100
Grinder14002500
Bug zapper8080
Total4880 W9380 W

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Cummins Onan P9500df
3.4 Total Score
9 reviews
Add your review
Price
4.8
Value
2.8
Quality
3.3
Performance
2.8

User Reviews

Most Recent Most Helpful Highest Rating Lowest Rating Add your review
  1. 4.5
    Price
    90
    Value
    90
    Quality
    90
    Performance
    90

    I do not understand any of these negative reviews. I have started mine manually, remotely and with the FOB. All good. Ran it for the 5 hr break in and changed the oil. Ran it again twice for 30 minutes. No problems.
    If this changes to my disappointment I will post it but so far so good.
    The noise is the 85 dB as listed when I measured it at 3′. I built an extended exhaust system for it the works really well.
    I say don’t hesitate to consider this generator.
    All the best.

    + PROS:
    • Looks good and good price for Canada.
    • Noise is as advertised.
    • The gas exhaust is not excessively hot and extending the exhaust is quite simple.
    • Assembly was easy.
    • I researched genies for 2 months and put the Cummins on the same platform as the Westinghouse (which don't seem to be readily availible).
    - CONS:
    • Well, honestly, I haven't found any yet. They are heavy (200 pounds dry) but generators of this size tend to be this heavy.
    • I haven't tried the propane fuel, yet. No need to now.
    Helpful(0) Unhelpful(0)You have already voted this
  2. 0.75
    Price
    30
    Value
    10
    Quality
    10
    Performance
    10

    Bought this Generator, did all the per checks, filled with oil, gas, the unit will not start up, I have drained the battery 3 times and still nothing ! I have called and sent emails out…. All they say is you need to take it to an authorized dealer for repairs ??? I don’t have time to run it all over for repairs, would like to return it with a full refund.

    + PROS:
    • Good looking was delivered on time
    - CONS:
    • Will not start up, very upset and can’t get any help
    Helpful(1) Unhelpful(0)You have already voted this
  3. 1.65
    Price
    30
    Value
    30
    Quality
    60
    Performance
    10

    Piece of crap. Trying to use during hurricane Iannjust now. Will only power up a single refrigerator – nothing else. If anything else plugged in will blow circuit both breakers and then you have nothing which is what this thing is. It’s a new unit. My old regular Honda worked great – put in shop for service whe hurricane Ian came up. Thought we had everything covered with this new on an/ Cummins unit. Boy was I wrong. Run, don’t just walk away from these. Even the cheap Harbor Freight units are better than these.
    Very bad product

    + PROS:
    • Automatic start
    - CONS:
    • Doesn’t work: will only power up one refrigerator. Nothing else.
    • Keeps blowing circuit breaker if ANYTHING else is plugged in.
    • Is a piece of crap. Needed for hurricane IAN just now
    Helpful(2) Unhelpful(3)You have already voted this
  4. 0.5
    Price
    10
    Value
    10
    Quality
    10
    Performance
    10

    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:
    • ABSOLUTELY NONE!!
    - 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(4) Unhelpful(1)You have already voted this
  5. Avatar
    Calvin Weimer May 23, 2022 at 8:12 am
    0.5
    Price
    10
    Value
    10
    Quality
    10
    Performance
    10

    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(2) Unhelpful(0)You have already voted this
  6. 0.65
    Price
    20
    Value
    10
    Quality
    10
    Performance
    10

    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(3) Unhelpful(0)You have already voted this
  7. Avatar
    Disappointed shopper October 13, 2021 at 6:49 pm
    1.75
    Price
    100
    Value
    20
    Quality
    10
    Performance
    10

    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(3) Unhelpful(1)You have already voted this
  8. Avatar
    Iron Horse Industries September 12, 2021 at 5:42 pm
    4
    Price
    80
    Value
    60
    Quality
    90
    Performance
    90

    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
  9. 1.15
    Price
    60
    Value
    10
    Quality
    10
    Performance
    10

    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(23) Unhelpful(3)You have already voted this

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