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Cummins Onan P9500df Spec Review

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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Price history for the Cummins Onan P9500df
Latest updates:
  • $1,131.00 - September 28, 2021
  • $1,219.00 - September 2, 2021
Data source: campingworld.com
Since: September 2, 2021
  • Highest Price: $1,219.00 - September 2, 2021
  • Lowest Price: $1,131.00 - September 28, 2021

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 who want to ensure that a power failure will not prevent them from working

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

Thanks to its dual-fuel technology, the Cummins Onan P9500df delivers 120/240V and offers power and versatility. When gasoline-powered, it benefits from a running wattage of 7500W and a peak wattage of 9500W. When propane-powered, it has 6750 rated watts and 8550 peak watts.

The generator features a conventional pull-start mechanism and also a simple and elegant electric starter (battery included). It is rated for a noise of 74 dBA (just slightly more noisy than a dishwasher). The Onan P9500df can also be remotely started, offering further convenience (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 0.41 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 provides the upcoming 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

With its dimensions of L27.3 x W26.3 x H26.3 in, the conventional, open frame design of the Cummins Onan P9500df offers stability and allows the generator to be raised above ground level. The device has been designed for tough environments and demanding outdoor use.

Even though this device may be technically portable (as in movable), manipulation and transportation without special equipment can be a challenge, as it weighs 194 pounds. 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.

From a security point of view, the generator is equipped with an automatic low oil shut-off and an overload protection (circuit breaker), giving you a peace of mind during use.

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: tool kit, key fob, battery charger, propane hose, oil and funnel.

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 generators of similar power (between 7000 and 8000 W).

  • As its weight is 194 pounds, the Cummins Onan P9500df falls in the expected weight range of the devices in the 7000-8000 rated wattage category. If you are concerned by weight, one of the champions in the above-mentioned power range is the Sportsman GEN85KIDF, with a dry weight of just 133 pounds.
  • Since the generator's noise is rated at 74 dBA, it has the roughly average expected noise for a device of similar power. For those who are looking for a less noisy device, we suggest the A-iPower SUA8000iSF. With just 65 dBA, it is one of the most quiet devices in this power range.
  • Thanks to an impressive running time of up to 16 hours at 25% load, the Onan P9500df benefits from a higher run time than many generators of a similar output. If you consider autonomy on a single full tank as one of the deciding factors, one of the generators in the same power range that offers the highest run time is the Predator 9500, with up to 18.5 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 can be considered as fuel efficient, due to its low estimated fuel consumption of only 0.41 GPH (gallon per hour) at 25% load, within the aforementioned wattage range. If fuel consumption is your top priority, we suggest to check out the Predator 9500, which has a fuel consumption of only 0.37 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 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
  • High run time
  • Fuel efficient
AVERAGE SPECS:
  • Decent weight (194 lbs)
  • Acceptable noise (74 dBA)
WEAKNESSES:

The Cummins Onan P9500df doesn't have any notably low specs.

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 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
Features
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
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%
EmissionsCARB, 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 sizer.
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
4.6 Total Score
3 reviews
Add your review
Price
8
Value
3
Quality
3.7
Performance
3.7
3 Reviews
Show all Most Helpful Highest Rating Lowest Rating Add your review
  1. 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(22) Unhelpful(3)You have already voted this
  2. 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(1) Unhelpful(1)You have already voted this
  3. 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(0) Unhelpful(0)You have already voted this

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