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Cummins Onan P2500i - 2200/2500W Inverter Generator

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Description

Zoom on the Cummins Onan P2500i

To sum up, the Cummins Onan P2500i is a quiet, compact and lightweight portable inverter generator tailored for:

  • Camping and tailgating hobbyists looking for a portable power source
  • 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.

Power & Run Time

The Cummins Onan P2500i in use

The Cummins Onan P2500i

Running on gasoline, the Cummins Onan P2500i operates with a 98 cc (3.4 hp) Ducar OHV 4-stroke engine, delivering 120V, with a running wattage of 2,200W and a peak wattage of 2,500W. Furthermore, its parallel capability (A058U945 parallel kit not included) allows power output to double when connected to another similar or compatible unit, ensuring expanded energy capacity and reliability for various applications.

Rated for 52 dBA (just slightly more noisy than a quiet suburb), the inverter generator's starting mechanism relies on a standard recoil pull-rope starting mechanism.

Thanks to its 1 gallon fuel tank, the Onan P2500i can run continuously for up to 10 hours on a full tank (with an average fuel consumption of approximately 0.1 GPH).

Featuring a <3% Total Harmonic Distortion (THD), the Onan P2500i delivers a clean sine wave, guaranteeing the safety of your sensitive electronics plugged into its AC outlets.

Outlets

The control panel is equipped with the following 2 AC outlets:

Duplex 120V 20A (5-20R)

Moreover, it comes equipped with 3 DC outlets: there's two 5V USB ports ensuring convenient charging of devices like mobile phones and tablets, for connectivity on the go and a 12V 8A receptacle making battery charging a breeze.

Portability

The Cummins Onan P2500i's characteristic encased inverter generator design (L19.8 x W10.5 x H18.3 in) provides an aesthetic advantage and contributes to quieter operation compared to any ordinary, open frame product. The featured design follows the latest trends and is ideal for easy and recreational use.

Weighing just 48 lbs, the Onan P2500i can be considered a lightweight portable generator. The generator can be moved with ease by only one person and so it can be enjoyed on-the-go. Adding to its convenience, the handle (molded in the case) enables easy carrying.

Features

Panel of the Cummins Onan P2500i

The Onan P2500i's control panel

Featuring a digital data center on its control panel, the Onan P2500i offers you convenient access to essential information about the power output, fuel level, voltage and remaining run time, facilitating effective monitoring of its activity and status.

In addition to this info, several light indicators serve to show you when the generator is ready, the generator is overloaded and its oil levels are insufficient.

Regarding security, the generator comes with an automatic low oil shut-off and an overload protection (circuit breaker), providing peace of mind during operation.

In addition to the traditional documentation and an owner's manual (opens in a new tab) to help you get started promptly, the Cummins Onan P2500i also includes several accessories: oil, funnel and tool kit.

Product Videos

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 inverter generators of similar power (between 1500 and 2500 W).

  • With a dry weight of 48 lbs, the Cummins Onan P2500i sits comfortably within the expected weight range for inverters generating 1500 to 2500 rated watts. If you are mindful of weight, the Genmax GM2000i is among the top contenders in this power range, with a dry weight of 34.2 pounds.
  • Delivering a rated noise output as low as 52 dBA, this inverter generator is has a quieter operation that most units of similar type and power. If noise emissions are important to you, one of the least noisy generators of this power range is the Honda EU2200i with only 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 inverter generators of a similar power. If runtime is a priority for you, the DuroMax XP2300iH stands out as one of the generators with the longest run time in its power range, providing up to 13 hours of continuous use.
  • Run time is a key metric, but it's dependent on the generator's fuel capacity. Therefore, discussing fuel efficiency is necessary to get the full picture. This inverter generator has a better fuel efficiency than other units in the aforementioned output range, consuming approximately 0.1 GPH (gallon per hour) at 25% load. If you wish to get a unit of similar power, but with one of the best fuel efficiency, you could consider the DuroMax XP2300iH, which has an impressively low fuel consumption of 0.08 GPH.
According to our stats, the following comparison is pretty popular: Cummins Onan P2500i vs Honda EU2200i.

Price comparison

As you can see from these interactive charts, when compared to other 1500-2500W inverter 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
  • Quiet for its power (52 dBA)
  • Fuel efficient
AVERAGE SPECS:
  • Decent weight (48 lbs)
  • Decent run time
WEAKNESSES:

The Cummins Onan P2500i doesn't have any notably low specs.

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
Parallel capableYes, cable not included
RV readyNo
FuelGasoline
Engine98 cc Ducar OHV 4-stroke
Starting systemRecoil
Warranty3 years
Power
VoltageAC: 120V 60 Hz, DC: 12V
Running watts2,200 W
Starting watts2,500 W
Running amps18.3 amps
Peak 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%
ComplianceCARB, EPA
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedOil, funnel, and tool kit
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.

Spec Improvement×

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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 sizer.
ItemRunning WattsStarting Watts
At homeAC (10,000 BTU)15002200
Satelite receiver250250
Total1750 W2450 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Blender400850
Game console150150
Total1740 W2330 W
For workDemolition hammer12601260
Electric fence (25 miles)250250
Bug zapper8080
Total1590 W1590 W
what happens when you run your Onan P2500i generator out of gas? (Asked January 26, 2024)

The unit will stop producing electricity.

Couldn't find the right answer for you? Ask your own question.

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Cummins Onan P2500i
1.9 Total Score
11 reviews
Add your review
Price
3.6
Value
1.8
Quality
1.2
Performance
1.1

User Reviews

Most Recent Most Helpful Highest Rating Lowest Rating Add your review
  1. 1.4
    Price
    50
    Value
    40
    Quality
    10
    Performance
    10

    Bought two of these one is great the other is junk. Kept taking it back and they always said bad gas. Finally took it to Cummins it was past a year they would pay for parts but not the $187.00 an hour labor. They called tech online told them to replace electronics. Then told did not fix it now replace carburetor. Total labor cost would be more than buying a new one for $800. Found several similar online reviews about a fried electrical board and flawed carburetor. Now I am waiting for the other one to start breaking down. Over a dozen contacts with RV dealer that sells but does not work on it, Cummins National and the shop. The shop was up front saying not to put a lot of labor time in as it would cost so much. They were honest but their product stinks

    + PROS:
    • many reviews including mine on carb failures or electronics. Onan is somewhat new to this type but they did not get it right quiet though not as quiet as some
    - CONS:
    • poor starting flawed manufacturing fuel and electronic part failures
    Helpful(1) Unhelpful(0)You have already voted this
  2. 1.5
    Price
    60
    Value
    30
    Quality
    20
    Performance
    10

    Bought two one is fine other one junk. Both start on first pull but one works and the other can’t run 2 minutes with or without load . Had to take it to Cummins store 90 minutes a way and it is there being figured out as camper dealer that sold and warrantied it won’t attempt to fix it. They just like to say bad gas and send you away.

    + PROS:
    • Started on first pull out of box. Lightweight can carry two at a time like suitcases.
    - CONS:
    • Poor run time keeps killing won't tolerate any load multiple trips to dealer
    Helpful(1) Unhelpful(0)You have already voted this
  3. 0.5
    Price
    10
    Value
    10
    Quality
    10
    Performance
    10

    Bought one a couple years ago for work. Right out of the box it wouldn’t hold steady RPMs. It did ok under a load, but still not right. Took it to a Cummins dealer fall of 2020 and was treated horribly as if I had Leprosy or something. They wouldn’t let me in and said I would have to schedule an appointment. I asked if I could schedule one and was told they were backed up for a few months. I had to have it for the job I was on, so I kept running it. I probably put 30 hours on it or so then it sat around for a while, the warranty was up and I never got it fixed. The next time I went to use it, it started fine, but then gas started leaking out of the bowl seal on the carb. I really don’t know what to do with it now. I don’t want to invest much in to fixing it after reading all of the poor reviews. I would not buy one again.

    + PROS:
    • It has the Cummins name
    - CONS:
    • It was poorly built
    Helpful(2) Unhelpful(1)You have already voted this
  4. 1.65
    Price
    80
    Value
    20
    Quality
    20
    Performance
    10

    I bought the OnanP2500i new in 2020 & it was to be our rv generator, when it sits for a couple weeks without use it is hard to start. Worse thing is the generator shuts off randomly and I never know if it will work or not, when it acts up it will not run longer then 20 to 30 minutes. Sometimes it will run for hours without any issues, very unreliable. It has been this way since new and has let us down a couple times when we needed it most. I contacted Cummins and they were not much help, they told me to take it to a recommended dealer to be looked at, I called the 3 they recommended within 2 hours of my home and not a single one called me back. Another call to cummins and they were no help so now the warranty has ended and I am left to sort it out.
    Generator had 24 hours on it, I regret not buying a Honda or Yamaha as the money I saved buying this one was not well spent, I do not recommend the onan P2500i to anyone.

    + PROS:
    • the price point is good, the unit is very quiet and is easy to move around for 1 person
    - CONS:
    • hard to start, unreliable, poor warranty service
    Helpful(2) Unhelpful(1)You have already voted this
  5. 1
    Price
    50
    Value
    10
    Quality
    10
    Performance
    10

    I bought this generator as I though Cummins / Onan was a reputable company, and the price was lower than the comparable Honda. Well, turns out this thing is a giant POS. Right out of the box it would not start and continues to not start consistently. After calling support they said I would have to take it to a service center. Due to Covid the center was closed and the thing is now out of warranty! Now I’m stuck with a $800 boat anchor. I should have bought the Honda.

    + PROS:
    • Looks good
    • Decent price
    - CONS:
    • Made in China
    • Will not start
    Helpful(4) Unhelpful(1)You have already voted this
  6. 1.5
    Price
    60
    Value
    20
    Quality
    20
    Performance
    20

    Purchased because of the competitive price and Cummins/Onan reputation for building reliable generators. Didn’t realize this was a badge engineered product related to several other brands. This has been a camping generator for use with my travel trailer in the mountains of Montana, Wyoming, and Idaho. Like others, the generator performed as advertised out of the box, but gradually developed starting issues. Turning up the idle speed screw slightly seemed to help with many starting issues, but once running the generator would start loading up and run poorly. Was quite variable from trip to trip, we never knew if it would be reliable or not. Finally discovered these generators are shipped with carburetors jetted for operation between 0 and 2,000 feet above sea level. Seem to run OK up to 2,500, maybe 3,000 feet. At 4,000 to 5,000 feet performance is poor at best. Above 5,000′, you are lucky if it runs at all. One trip was at Beartooth Lake just outside Yellowstone N.P., elevation 8,000′. At this altitude, the Cummins 2500i is nothing more than an expensive boat anchor. There is a high altitude jet kit with 3 different jets, but I’ve yet to find it available from any vendor including Cummin’s mail order parts. In my opinion, buyer beware if investing in this generator.

    + PROS:
    • Competitive price, but that is about the only positive attribute.
    - CONS:
    • Poor design that cannot function in a wide range of environments.
    Helpful(4) Unhelpful(1)You have already voted this
  7. 0.5
    Price
    10
    Value
    10
    Quality
    10
    Performance
    10

    After research, thought I was making best decision of price to wattage for my 2019 purchase. Reality shows much the opposite. Purchased 2 units, as did my brother (total 4 units) early 2019. All 4 units have been back to Cummins for warranty repair due to non-starting and other issues. Broken spark plugs initial warranty assessment. Took weeks to obtain replacement spark plugs. Units will run for a bit, then die. Have to loosen/remove gas cap, then unit will start and remain running. Dies shortly after gas cap is reinstalled. When needed as power source, seems that one will run and the other not – same fuel in both. Very disappointed. Not recommended.

    + PROS:
    • size, weight, parallel capable
    - CONS:
    • won't start. not dependable.
    Helpful(5) Unhelpful(0)You have already voted this
  8. 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(4) Unhelpful(0)You have already voted this
  9. 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(4) Unhelpful(2)You have already voted this
  10. 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(7) Unhelpful(2)You have already voted this
  11. 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(12) Unhelpful(2)You have already voted this

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