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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:

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

The following sections will present you in detail its power characteristics, the different outlets it offers, its overall portability, the extra features it benefits from, and any relevant emission compliance details.

Power & Run Time

The Cummins Onan P2500i in use

The Cummins Onan P2500i

The Cummins Onan P2500i is powered by a 98 cc (3.4 hp) Ducar OHV 4-stroke engine. It delivers 120V, runs on gasoline and offers a running wattage of 2200W as well as a peak wattage of 2500W. Moreover, since it is parallel capable (A058U945 parallel kit not included), its power may be doubled if linked to a second compatible unit.

The inverter generator features a conventional pull-start mechanism. It is rated for a noise of 52 dBA (just slightly more noisy than a quiet suburb).

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

Sensitive electronics can be safely plugged in the AC outlets, as the Onan P2500i produces a clean sine wave, with a <3% Total Harmonic Disruption (THD).

Outlets

The control panel features the following 2 AC outlets:

Duplex 120V 20A (5-20R)

Additionally, it features 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. This modern design aims to provide an ideal power solution to recreational users.

Labeled a lightweight portable generator, the Onan P2500i weighs just 48 lbs. As it can be moved by a single person without much effort, the generator and its power can be enjoyed on-the-go. It can also be carried without effort with a featured handle (molded in the case), further improving 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, fuel level and remaining run time, and thus, is helpful for the monitoring of its activity and status.

In addition to this info, the device’s light indicators will display if the generator is ready, the oil level is too low and the generator is overloaded.

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

While the standard documentation and an owner's manual (opens in a new tab), helpful for starting the device promptly, come with the Cummins Onan P2500i, the following accessories are also included: oil, tool kit and funnel.

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 and thus, may be used 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. In terms of weight, one of the champions in their power range is the WEN 56202i, 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.
  • As the Onan P2500i offers up to 10 hours run time on a full tank at a 25% load, it falls within the average autonomy range among the generators of a similar power. 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 Westinghouse WGen2000, 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 can be considered as fuel efficient, due to its low estimated fuel consumption of only 0.1 GPH (gallon per hour) at 25% load, within the aforementioned 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 sizer.
ItemRunning WattsStarting Watts
At homeMicrowave (1000 watts)15001500
Satelite receiver250250
Total1750 W1750 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Blender400850
LED TV150150
Total1740 W2330 W
For workDemolition hammer12601260
Drain cleaner250250
Bug zapper8080
Total1590 W1590 W

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Cummins Onan P2500i
1.5 Total Score
1 review
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1 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(0) Unhelpful(0)You have already voted this

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