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Cummins Onan P2500i Spec Review

The Cummins Onan P2500i is a quiet, compact and lightweight portable inverter generator with a rated wattage of 2200 W and a starting wattage of 2500 W.

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Picture of the Cummins Onan P2500i
Note: This unit is a rebranded version of the Westinghouse iGen2500, with an additional DC outlet.
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Description

Zoom on the Cummins Onan P2500i

In summary, the Cummins Onan P2500i is a quiet, compact and lightweight portable inverter generator especially useful for:

  • Tailgating and campground aficionados with the desire of enjoying power anywhere they go
  • Handcrafting enthusiasts who wish to work on-the-go

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 P2500i in use

The Cummins Onan P2500i

The Cummins Onan P2500i's core is the 98 cc (3.4 hp) Ducar OHV 4-stroke engine, which runs on gasoline. With an output of 120V, it provides a running wattage of 2200W and a peak wattage of 2500W. In addition, the device is parallel capable (A058U945 parallel kit not included) and thus, can be linked to a similar or compatible unit for added power.

With a noise rating of 52 dBA (just slightly more noisy than a refrigerator), the inverter generator features a simple traditional pull-start mechanism.

With a full tank, the Onan P2500i can operate for up to 10 hours (fuel consumption around 0.1 GPH), thanks to its fuel capacity of 1 gallon.

The Onan P2500i produces a clean sine wave: thanks to a <3% Total Harmonic Disruption (THD), your sensitive electronics can be safely plugged in the AC outlets.

Outlets

The control panel features the upcoming 2 AC outlets:

Duplex 120V 20A (5-20R)

Furthermore, it has 3 DC outlets: there's two 5V USB ports with which you may charge electronics, for example mobile phones or tablets, conveniently and a 12V 8A receptacle with which charging your batteries is made easy.

Portability

As the Cummins Onan P2500i is an inverter generator, its encased design (L19.8 x W10.5 x H18.3 in) offers more aesthetics than a conventional, open frame product. The generator has a contemporary design, convenient for recreationally generating power.

Since the Onan P2500i weighs only 48 lbs, it can be labeled as a portable lightweight generator. The device can be easily moved by just one person and thus, its power may be enjoyed on-the-go. Further convenience is provided by its handle (molded in the case), as it allows you to carry it effortlessly.

Features

Panel of the Cummins Onan P2500i

The Onan P2500i's control panel

To help you monitor the Onan P2500i's status and activity, its control panel is equipped with a digital data center, giving you information on the fuel level, voltage, remaining run time and power output.

In addition to this info, some light indicators allow you to instantly see if the generator is ready, the generator is overloaded and the oil level is too low.

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

Besides the classic documentation and an owner's manual (opens in a new tab) to get you promptly started, the Cummins Onan P2500i also comes with some accessories: funnel, tool kit and oil are included.

Emissions

The Cummins Onan P2500i 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 P2500i versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Cummins Onan P2500i compare to generators of similar power (between 1500 and 2500 W).

  • As far as its dry weight is concerned, the Cummins Onan P2500i weighs just 48 pounds and thus, it is one of the lighter 1500 to 2500 rated wattage generators. In terms of weight, one of the champions in their power range is the Champion 200949, standing at just 38.6 lbs.
  • At a lowest noise rating of 52 dBA, this inverter generator is one of the quieter devices of similar power. If noise emissions are one of your priorities, you may be interested in the Honda EU2200i, one of the least noisy generators similarly powerful as this one, rated for 48 dBA.
  • The Onan P2500i, offering a run time of up to 10 hours with a full tank at a 25% load, falls within the average autonomy range when compared to its peers. If concerned with autonomy, one of the products of a comparable power output, which offers the highest run time, is the Westinghouse WGen2000, boasting with up to 26 hours.
  • Autonomy holds its importance, however, it is largely dependent on the generator’s fuel capacity and so, it is nonsensible to discuss it without mentioning fuel efficiency as well. This inverter generator, with an estimated fuel consumption of just 0.1 GPH (gallon per hour) at 25% load, is one of the more fuel efficient generators, for the previously mentioned wattage range. If you wish to acquire one of the most gasoline efficient products of this power range, the Predator 2000, with a fuel consumption of 0.08 GPH could be in your good books.
According to our stats, the following comparison is pretty popular: Cummins Onan P2500i vs Honda EU2200i.

Price comparison

As you can see from this interactive chart, when compared to other 1500-2500W generators, the Cummins Onan P2500i 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
  • Parallel capable
  • Inverter
  • Lightweight (48 lbs)
  • Quiet for its power (52 dBA)
  • Fuel efficient
AVERAGE SPECS:
  • Decent run time
WEAKNESSES:
  • No electric start

Do you own the Cummins Onan P2500i and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterYes
PortableYes
Parallel capableYes, cable not included
RV readyNo
FuelGasoline
Engine98 cc Ducar OHV 4-stroke
Starting systemRecoil
Power
VoltageAC: 120V 60 Hz, DC: 12V
Running watts2200 W
Starting watts2500 W
Running amps18.3 amps
Peaks amps20.8 amps
Run time @50% load8 h
Run time @25% load10 h
Features
GFCI outletsNo
Covered outletsYes
Automatic Voltage RegulationInverter
AC outlets1x Duplex 120V 20A (5-20R)
DC outlets2x 5V USB port
1x 12V 8A receptacle
Data centerPower output, fuel level, remaining run time and voltage
IndicatorsLow oil, overload and output ready
Fuel tankSteel, 1 gal
Fuel gaugeDigital
Misc
Weight48 lbs
Approx. dimensions (L x W x H)19.8 x 10.5 x 18.3 in
Noise (lower limit)52 dBA
THD< 3%
EmissionsCARB, EPA
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedOil, funnel, and tool kit
Warranty3 years
Other model numbersA058U944

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 P2500i 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 homeRefrigerator (energy star)1921192
Clothes iron12701270
Cell phone charger2020
Total1482 W2482 W
For campingRadiant heater13001300
RV refrigerator180600
Slow cooker270270
Total1750 W2170 W
For workDemolition hammer12601260
Drain cleaner250250
Bug zapper8080
Total1590 W1590 W

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Cummins Onan P2500i
1.4 Total Score
2 reviews
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  1. 0.75
    Price
    20
    Value
    20
    Quality
    10
    Performance
    10

    Bought this POS thinking Cummins and Onan were top of the line.
    I have yet to have it run long enough to get through even one tank of gas…

    + PROS:
    • Starts nice, quiet, small
    - CONS:
    • Runs for 30 minutes then shuts down with only 33 hours on it...
    • It would be great if it ran long enough to get through one tank of gas...
    Helpful(1) Unhelpful(0)You have already voted this
  2. 0.65
    Price
    20
    Value
    20
    Quality
    0
    Performance
    10

    Mine ran crappy right out of the box. It’s now at a cummins repair center where it was diagnosed with a bad carb, then a warped cylinder head….I’ve used it once. Very disappointed in this product. I bought it for the cummins name. I hope they come thru and make things right

    + PROS:
    • good looking unit
    • always started but...
    - CONS:
    • Ran bad out of the box. Service is slow. Defective
    Helpful(1) Unhelpful(0)You have already voted this

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