Cummins Onan P4500i Portable Inverter Generator
- 3,700 running watts, 4,500 starting
- 224cc OHV, 7.3 HP engine
- TT-30R 30A RV outlet, dual 5V USB
- 3.4 gallon tank, up to 18 hours runtime
- Push button and remote start, pull cord backup
- Parallel capable for up to 50A
- 98 lb, 24.5 x 18.25 x 20.5 inches
- 3 year warranty
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
An inverter generator with RV-ready output and remote start for campers and home backup. Noise and distortion figures are not listed, and only the generator is listed in the box.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B081ZG9VLJModel: Onan P4500iCategory: Generators
Overview
Cummins builds this inverter generator around a mid size OHV engine with push button and remote start, plus a pull cord as backup. A travel trailer outlet and USB ports cover campers and phones, and a second unit can be paralleled for more power.
RV readiness and remote start make it easy to use from inside a camper. Long runtime on a tank suits overnight use. It is called super quiet, but no decibel figure is given.
Who it's for
Travel trailer owners and households backing up essentials. Larger homes with central air need more output than one unit gives.
Pros and cons
- Remote and push button start
- RV ready outlet
- Long runtime per tank
- USB charging ports
- Noise level not listed
- Only the generator listed in box
Performance notes
Running watts set continuous capacity, with the starting margin covering an RV air conditioner's surge. Inverter engines slow down at light load, which is how long runtime is reached. Pairing two units roughly doubles available output for bigger loads.
Where it stands among generators
- 18 hours runtime: longer than 96% of the generators we list.
From the specs of the 84 generators we list; not a test result.
Specifications
| Brand | Cummins |
|---|---|
| Model | Onan P4500i |
| Dimensions & fit | |
| Item weight | 98 pounds |
| Item Dimensions L x W x H | 24.5 x 18.25 x 20.5 inches |
| Capacity & performance | |
| Tank volume | 3.4 gallonslower than 50% of 29 generators |
| Power & efficiency | |
| Running Wattage | 3,700 watts |
| Starting Wattage | 4,500 watts |
| Fuel Type | Gasoline |
| Voltage | 120 volts |
| Total Power Outlets | 3, including TT-30R 30A and dual 5V USB |
| Warranty & support | |
| Warranty Description | 3 year |
| Other details | |
| Runtime | 18 hourshigher than 96% of 25 generators |
| Ignition System Type | Push button, remote and pull cord |
| Additional Features | Parallel capable up to 50A, overload protection |
| Engine Displacement | 224cc OHV, 4 stroke, 7.3 HP |
Closest rivals on specs
Westinghouse WGen3600cv Portable Generator- Tank volume 3.4 vs 4 gallons (-15%)
Frequently asked questions
Can two Cummins Onan P4500i generators run together?
Yes. It can parallel with another P4500 for up to 50A.
Can the Cummins Onan P4500i power a camper?
It has a 30A TT-30R outlet for camper use.