Westinghouse iGen4500 vs Onan p4500i

The advantages of inverter generators over conventional portable generators is that they are more quiet, more compact, lightweight, more fuel efficient, also safe for sensitive electrical devices and usually more environmentally friendly. Seeing the advantages an inverter generator is more suitable for occasional use and specifically for outdoor activities like camping. An inverter generator is a good choice for when you don’t need a lot of power but do need convenient clean electricity that is easy to carry with you. Let us take a closer look at two inverter generators which are Westinghouse iGen4500 and Onan P4500i.

Westinghouse iGen4500

The Westinghouse iGen4500 is a portable inverter generator mostly geared towards RV travellers, homeowners who need emergency backup power for their essentials and of course for camping. This generator design includes a gasoline-fueled 224 cc Westinghouse OHV 4-stroke engine, which has an 120V output. It gives a running wattage of 3700W and also a peak wattage of 4500W. Read also: WEN 56380i vs Predator 3500.

A simple traditional pull-start mechanism is used for this inverter generator but there is also a convenient and easy-to-use electric starter, the battery included. Moreover the iGen4500 can be remotely started, key fob is also included. The noise rate for this generator is 52dBA and it can operate for up to 18 hours with a full tank, where the fuel capacity is 3.4 gallons. 

The control panel provides 3 AC outlets which are Duplex 120V 20A (5-20R) and 120V 30A (TT-30R) receptacle, TT as in Travel Trailer means that this Westinghouse generator is RV ready. In addition it features 2 DC outlets, which are two 5V USB ports allowing to charge electronics such as mobile phones and tablets.

 Westinghouse iGen4500 Onan p4500i
Product Dimensions18 x 10 x 15.5 inches
22.75 x 17.3 x 20 inches
Shipping Weight93 pounds
15 pounds
Best offerCheck priceCheck price

The iGen4500’s weight is 98lbs, it can fulfill your power needs anywhere. Once placed on the floor, effortless displacement is possible since it has a wheel kit and telescopic handle. A digital data center is available to assist you in monitoring its status and activity, it provides information on the voltage, lifetime, run hours, fuel level, power output and remaining run time. A light indicator lets you know if the generator is overloaded, to check the fuel level there is a built-in fuel gauge. The following accessories are included : tool kit, battery charger, key fob, oil and funnel.

Onan P4500i

The Onan P4500i which is produced by Cummins, has an 224cc OHV 4-Stroke Cummins engine it gives 3700 running watts and 4500 peak watts. This remote start model features a rotating digital display that shows the remaining fuel, run-time left on the tank, the power load and lifetime run hours.Beside the remote start with a push-button, this generator has a pull-cord backup. At 98lbs this generator has a wheel kit and a telescoping handle, it weighs less than many competing inverter generators of equal power.  

There are four outlets on this generator, one duplex 120V 20A (5-20R) AC outlet, two 5V USB ports which are DC outlets, and one 120V 30A (TT-30R) this means that the generator is RV ready. The fuel-efficient Cummins inverter model has a gasoline fuel gauge, it can run for 18 hours on 25% load and 15 hours on 50% load. Thanks to its double-insulated case the noise rate for this generator is 52 dBA. The Onan P4500i is capable of paralleling with another P4500 inverter generator to reach 50A of power. Onan has less than 3% Total Harmonic Distortion which provides clean power for sensitive electronics and everyday appliances. 

Westinghouse iGen4500 vs Onan p4500i

- 3700 Rated Watts and 4500 Peak Watts at Less Than 3% THD – Telescoping Handle – Gas Powered – Remote Start With Included Key Fob, Electric and Recoil Start
- Features a 5–20R 120V Duplex Household Outlet, an RV-Ready Tt-30R 30 Amp Outlet and Two USB Outlets – Great Choice for Travel Trailers or Home Use – Strong Enough to Run All Your Essentials
- Led Data Center: Rotating Digital Display Shows Fuel Level, Power Output, Remaining Run Time, Voltage Output, and Lifetime Hours
- Extremely Quiet, Extremely Fuel Efficient: as Low as 52 dBA Noise Output and Up to 18 Hour Run Time on a 3. 4 Gallon Gas Tank – Features “Economy Mode” for Maximum Fuel Efficiency
- Protect your Generator for The Weather and Dirt
- Fits like a Glove CUSTOM MADE
- Custom Fitted Cover for the Westinghouse 4500 igen4500 Watt Generator


The Westinghouse iGen4500 and Onan P4500i have similar type outlets with 120V 20A and 120V 30A (TT-30R) AC outlets, thanks to the TT-30R both generators are RV ready. Also there are 2 DC outlets of two 5V USB ports which you may charge electronics, like mobile phones, conveniently. These two generators have the exact same weight at 98lbs, in addition both companies offer wheel kits and telescopic handles to help you move your generator easily. 

The noise rate at 52 dBA is offered by both of these generators, this means you can have a normal conversation at a few feet away. With a full tank, iGen4500 and P4500i can reach up to 18 hours operation. For the THD both generators also share the same number at <3% this generates a clean sine wave. The LED Data Center makes two of these generators easy to monitor its activity and status on the lifetime, run hours, remaining run time, fuel level, voltage and power output. 

Finally we can see that the Westinghouse iGen4500 and Onan P4500i have big similarities, so we can say that they came to a draw. Through the outlet type, weigh, noise rate and even the LED data center shares the same numbers and features. These generators are perfect for RV travellers who wish to upgrade their experience, people who occasionally participate in outdoor fairs, festivals or events, homeowners and of course for tailgating and campground aficionados with the desire of enjoying power anywhere they go. 

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