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Cummins Onan P9500df Spec Review

The Cummins Onan P9500df is an open frame dual fuel portable 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 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 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

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 dishwasher), this generator can be started via a conventional pull-start mechanism, or a simple and elegant electric starter (battery included). Moreover, to offer you even more convenience, the Onan P9500df can also 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 0.41 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

Because the Onan P9500df is equipped with a twist-lock L14-30R receptacle, it is transfer switch ready: it can power your home during a power outage, as it can be easily connected to your breaker box to power your household.

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.

Since the generator weighs 194 lbs, it will be incredibly difficult to manually lift it and transport it, even though it is technically considered to 'be portable' (in the sense that it is 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

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.

The fuel level of the generator can be determined quickly, easily, and conveniently with the help of its built-in fuel gauge.

Security-wise, this product benefits from an overload protection (circuit breaker) and an automatic low oil shut-off, which gives you a complete peace of mind when using it.

Besides the classic documentation and an owner's manual (opens in a new tab) to get you promptly started, the Cummins Onan P9500df also comes with some accessories: tool kit, oil, funnel, key fob, battery charger and propane hose are included.

Emissions

The Cummins Onan P9500df is EPA-approved and CARB-compliant. Thus, selling and purchasing this generator is allowed in each of the 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 generators of similar power (between 7000 and 8000 W).

  • Since the generator weighs in at a dry weight of 194 lbs, the Cummins Onan P9500df belongs in the expected weight range for devices which can produce between 7000 and 8000 rated watts. 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.
  • As the Onan P9500df features an autonomy of up to 16 hours at 25% load, it has one of the highest run times in comparison to the other generators of its power range.
  • The run time is important, but also hugely depends on the capacity of the fuel tank and doesn't mean much if we don't talk about fuel consumption as well. This generator has an average fuel consumption among comparably powerful devices, as it reaches 0.41 GPH (gallon per hour) at a 25% load. If fuel consumption is your top priority, we suggest to check out the Champion 100520, which has a fuel consumption of only 0.4 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
AVERAGE SPECS:
  • Decent weight (194 lbs)
  • Acceptable noise (74 dBA)
  • Decent fuel efficiency
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
Peaks 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.

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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