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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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Description

Zoom on the Cummins Onan P9500df

In summary, the Cummins Onan P9500df is a portable generator especially useful for:

  • Food van owners who know that just a short power outage could lose them hundreds of dollars
  • Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • Professionals who want to be able to deliver results, even during a power failure

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

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 7500W along with a peak wattage of 9500W. While propane-powered, it provides 6750 rated watts and 8550 starting watts.

At a noise rating of 74 dBA (just slightly more noisy than a dishwasher), this generator can be started via a conventional pull-start mechanism, or a simple and elegant electric starter (battery included). The Onan P9500df can also be remotely started, offering further convenience (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 0.41 GPH). If propane is used, it can operate for up to 8 hours (on a 20 lbs tank - propane consumption around 0.59 GPH).

As the Onan P9500df has a relatively high THD (<23%), it is not recommended to use it to power 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 dimensions of the Cummins Onan P9500df, which are L27.3 x W26.3 x H26.3 in, and its typical, open frame design provides stability and enables the generator to be raised above ground level. The featured design is ideal for the outdoors and all tough environments.

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. 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.

Features

Panel of the Cummins Onan P9500df

The Onan P9500df's control panel

The Onan P9500df's status and activity may be monitored conveniently via the control panel, as it features 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 standpoint, the product offers an overload protection (circuit breaker) and an automatic low oil shut-off, allowing you to use it with a peace of mind.

Apart from the typical documentation and an owner's manual (opens in a new tab), which lets you start it right away, the Cummins Onan P9500df also is packed along with the following accessories: propane hose, key fob, funnel, tool kit, battery charger and oil.

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 wattage calculator.
ItemRunning WattsStarting Watts
At homeAC (10,000 BTU)15002200
Microwave (1000 watts)15001500
Electric fry pan15001500
Sump pump (1/2 hp)10502150
Refrigerator (energy star)1921192
Satelite receiver250250
Total5992 W7092 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
Grinder14002500
Bug zapper8080
Total4880 W9380 W

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Cummins Onan P9500df
2.3 Total Score
1 review
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1 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(4) Unhelpful(1)You have already voted this

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