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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 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 be able to deliver results, even during a power failure

In the sections ahead, the power characteristics, availability of various outlets, the portability, and any additional features of the device shall be discussed, including 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.

Enjoying a noise rating of 74 dBA (just slightly more noisy than a dishwasher), 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). For additional convenience, the Onan P9500df may also be remotely started (key fob included).

Regarding its running time, the Onan P9500df, with a 6.6 gallons fuel capacity can operate for up to 16 hours with a full tank of gasoline (fuel consumption around 0.41 GPH). When using propane, it can run 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 features 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

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. This type of design is ideal for tough environments and heavy outdoor use.

Although this generator is technically considered 'portable' (in the sense that it can be moved), its 194 lbs make it incredibly difficult to manually lift and transport. 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 control panel of the Onan P9500df includes a convenient meter showing you voltage, frequency and lifetime hours, helpful for 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 far as security is concerned, the generator can be used with a peace of mind, as it features an overload protection (circuit breaker) and an automatic low oil shut-off.

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

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, 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).

  • With a dry weight of 194 pounds, the Cummins Onan P9500df finds itself in the expected weight range for generators able to produce between 7000 and 8000 rated watts. In terms of weight, one of the champions in their power range is the Sportsman GEN85KIDF, standing at just 133 lbs.
  • Because this generator emits noise as low as 74 dBA, it can be considered to have a pretty average expected noise rating for a device of its power. If noise emissions are one of your priorities, you may be interested in the A-iPower SUA8000iSF, one of the least noisy generators similarly powerful as this one, rated for 65 dBA.
  • Since the Onan P9500df boasts with a run time of up to 16 hours at 25% load, it can be safely judged as one of the devices with the highest run time among those of a comparable output.
  • 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. Standing at an estimated 0.41 GPH (gallon per hour) at a 25% load, this generator is somewhat average in this area compared to other devices, within the aforementioned wattage range. If you are concerned with gasoline efficiency, having a fuel consumption of just 0.4 GPH, the Champion 100520 is a device you should look out for.

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 hN/A
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 and battery
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 size calculator.
ItemRunning WattsStarting Watts
At homeDish washer15003000
AC (10,000 BTU)15002200
Microwave (1000 watts)15001500
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
Grinder14002500
Bug zapper8080
Total4880 W9380 W

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