Cummins Onan P4500i vs Westinghouse iGen4500: What’s The Difference

cummins onan p4500i vs westinghouse igen4500
cummins onan p4500i vs westinghouse igen4500

Are you looking for a portable generator to help you supply power to your RV or camper? Fortunately, we have the answers for you to choose the best generator between the Westinghouse iGen4500 and the Onan P4500I.

These generators are extremely similar, but you should pick the best one that suits your needs. Your best option depends on your lifestyle and how much energy supply you require for your RV or camper. You can also use these generators in your home as a backup portable power supply.

Please continue reading to learn the differences between the Cummins Onan P4500i and Westinghouse iGen4500. Our guide will help you select the best one and understand your generators better than ever before.

Cummins Onan P4500i VS Westinghouse iGen4500

Similarities Between Cummins Onan P4500i and Westinghouse iGen4500

There are plenty of similarities you can expect when you purchase these generators. In fact, these two are compared so often because of how similar they are as far as functionality and looks go. Below, we will detail the similarities so that you understand the benefits of both of these generators and how each generator can help you with your RV lifestyle.


manufactured by the same company

The Cummins Onan P4500i and Westinghouse iGen4500 are manufactured by the same company, despite being under different brand names. So, a lot of these generators are created in the same factory. That doesn’t necessarily mean that they’re created with the same materials, but it does mean that they have a similar build process.

Any generators you purchase from Westinghouse or Onan will come from the same manufacturer. Depending on your lifestyle situation, you can purchase portable or permanent generators through either brand.



You’ll also notice that these generators have extremely similar designs. They have the same dimensions and can fit into the same areas in your RV. However, people don’t purchase their generators for the designs. They purchase the generators for functionality instead.

For example, these generators have handles and wheels so that you can transport them easily without lifting them.

The durable design these generators offer can help you with outdoor activities. The Westinghouse is usually blue, but the Onan is typically Gray. Either way, you won’t notice these generators much in your RV because you can tuck them away.



You can find either a portable generator at a camping supplies store or an RV specialty shop. Fortunately, you don’t have to go out of your way to purchase an Onan or Westinghouse generator.

Due to the similar materials and availability of these products, they’re around the same price range. However, you may notice price fluctuations if something goes wrong with the supply and demand.

Several shipping situations globally can affect a generator’s supply and demand, which we recognized during the COVID-19 pandemic. Prices rose for generators and other battery-powered devices during the pandemic because there was a shortage of supplies.

Gasoline Powered

Gasoline Powered

Both generators are powered by gasoline, which is convenient because you can find this fuel anywhere you go. Gas stations are located everywhere to fill up your vehicle, and you can use the same gas in your portable generator. So, keep a gas tank in the back of your RV with your generator so that you can fill it up next time you stop to refuel.

If you’re camping for a few weeks in a remote area, you may want to bring a few gas cans with you to be prepared consistently. You don’t want to lose power to your RV, and you rely on your generator for electricity. You may be able to find shore power at the campsite, but generator power is also necessary if you want a consistent supply.



Although both generators offer plenty of electric supply to your RV, they are portable thanks to their design. They’re not lightweight because they weigh at least 98 pounds, but they’re easy to move around because they’re on wheels and they have a handle. So, you can move these generators just like you would a suitcase.

The only problem you may have when transporting these generators around is when something gets caught in your wheel . If something is caught, then your wheels will stop working, and you’ll need to take time to remove the obstruction.

These generators’ portability can also question when you’re moving up and down stairs. Use extreme caution when carrying these generators up and down the stairs, and ensure that you lift them instead of using them on the wheels. You may need two people to carry these generators up a flight of stairs comfortably.


quiet portable generator

People’s main problem when they bring portable generators along in their RV is noise complaints . You need to keep your electricity on at night to sleep comfortably at the temperature you prefer. Your generator supplies power to your electrical devices managed by your camper thermostat.

Fortunately, the Cummins Onan P4500i and Westinghouse iGen4500 are both extremely quiet portable generators, so you don’t have to worry about sleeping interruptions. Additionally, you can watch TV in your camper as you fall asleep without worrying about the generator noise overpowering your television.

Portable generators that offer quiet comfort cost more than generators that don’t have silencing mechanisms. However, you’ll appreciate the larger price once you use your generator because you’ll sleep better than ever.

Differences Between Cummins Onan P4500i and Westinghouse iGen4500

Despite all the similarities between these generators, there are plenty of differences you should consider before making a purchase. Understanding the differences will help you pick the best generator for your RV, home, or other recreational situation.

Portable generators are handy to have around, even if you’re not an RV owner. You never know when you could benefit from a backup power supply during a storm or other natural event.

Brand Name

Brand Name

Their brand names are the number one difference between the Cummins Onan P4500i and Westinghouse iGen4500. The Westinghouse company has been around since 1886 and has had a strong name in the electric industry since its genesis.

The Westinghouse company also plays a massive role in the production and distribution of nuclear fuel. This is one of the many ways people power their electronics and other devices, and there are few nuclear power plants around.

Meanwhile, the Onan brand is associated more with military and civilian engines. This company was made in 1925 and has specialized in electric engines since its founding. However, both of these companies manufacture their generators at Cummins Inc.


the colors

The most recognizable difference between these generators is the colors. The Westinghouse offers a navy-blue generator, but Onan offers a grey one. You can purchase the one that best correlates with the interior of your RV. Unfortunately, it can be difficult to hide your RV generator, and you don’t want it to clash.

Since both generators offer similar electrical outputs, you can choose which color best suits your interior. You’ll lean more toward grey if you have a neutral interior home or RV. However, if you love blue or love vibrant colors in general, the other option is best.


slight size difference

This difference might come as a surprise to most of you. There is a slight size difference between the Cummins Onan P4500i and the Westinghouse iGen4500. As you can see from our chart below, the Westinghouse option is slightly bigger and heavier.

Usually, this won’t be a deal breaker for people because the sizes are similar. However, when you live in a tight space, every inch counts.

Despite the slight size difference between these products, they’re almost equal in portability. They come with wheels and handles, so you have an easy time bringing them anywhere you go. Of course, carrying around 100 pounds is a hassle, but this is pretty lightweight for a generator.

A nonportable generator option will weigh more than double the amount of these generators. Plus, nonportable options won’t come with a wheel or handles, so you’ll need tons of assistance getting them where they need to go. So a portable option can be beneficial even if you’re looking for a generator at your house.

A nonportable generator

Cummins Onan P4500i Westinghouse iGen4500
Run Time 18 hrs. 18 hrs.
Weight 98 104.7 lb.
Size 24.5L x 18.25 W x 20.5 H 24.5L x 17.5W x 20H

Final Thoughts

portable generator

Now that you understand the similarities and differences between the Cummins Onan P4500i and Westinghouse iGen4500 generators, it’s time for you to decide. Fortunately, these generators are built extremely similarly, so you’ll be satisfied with your product no matter which one you choose.

The companies that make these generators also have a strong reputation in the electrical industry. The main factor you should consider before making your purchase is whether or not you have a brand preference or if the generator can fit in your space.

The Westinghouse generator is slightly larger and heavier than the Onan. Hopefully, this guide helps you select the best generator that fits your lifestyle.

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