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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 a nutshell, the Cummins Onan P2500i is a quiet, compact and lightweight portable inverter generator mostly geared towards:

  • Camping and tailgating buffs looking to enhance their experience
  • 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 design includes a gasoline-fueled 98 cc (3.4 hp) Ducar OHV 4-stroke engine. With a 120V output, it gives a running wattage of 2200W and also 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.

At a noise rating of 52 dBA (just slightly more noisy than a refrigerator), the inverter generator is started via a conventional 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 includes the following 2 AC outlets:

Duplex 120V 20A (5-20R)

In addition, it provides 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 you may charge your batteries with ease.

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.

Weighing just 48 lbs, the Onan P2500i can be considered a lightweight portable generator. The device can be easily moved by just one person and thus, its power may be enjoyed on-the-go. Its handle (molded in the case) allows you to carry it easily, further enhancing its convenience.

Features

Panel of the Cummins Onan P2500i

The Onan P2500i's control panel

A digital data center, one of the features of the Onan P2500i’s control panel, gives you information on the power output, voltage, remaining run time and fuel level, and thus, is helpful for the monitoring of its activity and status.

In addition to this info, some light indicators allow you to instantly see if the generator is on overload, its oil levels are insufficient and the generator is ready.

From a security standpoint, the product offers an automatic low oil shut-off and an overload protection (circuit breaker), 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 P2500i also is packed along with the following accessories: oil, funnel and tool kit.

Emissions

The Cummins Onan P2500i 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, which makes it suitable for use 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).

  • Regarding its weight, the Cummins Onan P2500i only weighs in at 48 pounds, which means it's one of the lighter generators in the 1500-2500 rated wattage range. Regarding dry weight, one of the champions in the same power range is the Champion 200949, with a dry weight of only 38.6 lbs.
  • As its lowest possible noise is rated at 52 dBA, this inverter generator qualifies as one of the more quiet of the products of similar power. For those who are looking for a less noisy device, we suggest the Honda EU2200i. With just 48 dBA, it is one of the most quiet devices in this power range.
  • The Onan P2500i, falls within the average autonomy range compared to generators of a roughly same power, with a run time of up to 10 hours at a 25% load and a full tank. Furthermore, considering the run times, one of the generators which have a roughly same power output, with the highest autonomy, is the Westinghouse WGen2000, as it provides up to 26 hours.
  • While the run time is an important parameter, it is dependent on the fuel tank’s capacity and thus, doesn’t say much on its own unless we consider fuel consumption as well. At an estimated fuel consumption of 0.1 GPH (gallon per hour) at 25% load, this inverter generator is a rather fuel efficient one within its wattage category. 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.

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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 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
1.3 Total Score
4 reviews
Add your review
Price
2
Value
1.5
Quality
0.8
Performance
1
4 Reviews
Show all Most Helpful Highest Rating Lowest Rating Add your review
  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(2) 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(2) Unhelpful(0)You have already voted this
  3. 0.75
    Price
    30
    Value
    10
    Quality
    10
    Performance
    10

    We got this brand new out of the box and took it three hours away where it decided to completely take a poop on us and barely charged our battery so had to make a trip home around 10pm.

    + PROS:
    • Looks nice
    • Quiet
    - CONS:
    • Ran for a couple of hours and stopped working.
    • Unreliable.
    Helpful(0) Unhelpful(0)You have already voted this
  4. 0.5
    Price
    10
    Value
    10
    Quality
    10
    Performance
    10

    This is the worst generator I’ve ever came in contact with spills gas and oil all over the place never wants to start and shuts off when it wants to and this is brand new out-of-the-box. Would not ever recommend it

    + PROS:
    • No pros doesn’t work for any tools
    - CONS:
    • No pros doesn’t work for any tools
    Helpful(0) Unhelpful(0)You have already voted this

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