Cummins Onan P4500i Portable Inverter Generator
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At a glance
- Running Watts
- 3,700 W
- Peak Watts
- 4,500 W
- Fuel
- Gasoline
- Engine
- 7.4 hp OHV 4-stroke
- Tank Capacity
- 3.4 gal
- Runtime
- 18 hrs at 25% load / 15 hrs at 50%
- Noise Level
- 52 dBA
- Harmonic Distortion
- < 3% THD
- Outlets
- 2x 120V 20A, 1x TT-30R 120V 30A, 2x USB DC
- Weight
- 98 lb
- Start
- Remote / push-button electric
- Parallel Capable
- Yes (up to 50A)
- Warranty
- 3-year residential / 1-year commercial
Why this generator
- RV-ready with 30A TT-30R outlet
- Ultra-quiet 52 dBA operation
- Up to 18-hour runtime on a single tank
- Remote and push-button electric start
- Parallel capable up to 50A
- LED digital data center display
Everything you need to know
The Cummins Onan P4500i is a 4,500-watt portable inverter generator built for real-world power on the move — camping and RVs, tailgating, the jobsite, and emergency home backup for the essentials when the grid drops.
Clean Inverter Power for Sensitive Electronics
Inverter technology produces clean, stable sine-wave power (low total harmonic distortion) that's safe for laptops, phones, TVs, and other sensitive electronics — power a conventional open-frame generator can't guarantee. It also runs quieter and lighter than conventional units of similar output.
Efficient Gasoline Power
The P4500i runs on gasoline with the fuel efficiency inverter technology is known for — the engine throttles up and down to match your load instead of running flat-out, so a tank lasts longer at partial load.
Ready When You Need It
With 4,500 starting watts, the P4500i comfortably powers what matters in an outage — refrigerator or freezer, lights, fans, phone and laptop chargers, a window AC or sump pump — and on a job it keeps tools running where there's no outlet. Genuine Cummins Onan build quality means it starts when you ask it to, year after year.
Genuine Cummins Onan, Shipped Free
This is a genuine Cummins Onan portable, backed by the Cummins factory warranty. Total Generator Pros ships it free within the contiguous United States, with real generator experts a phone call away before or after the sale.
- 4,500 starting watts
- Inverter technology — clean, electronics-safe power
- Gasoline powered
- Genuine Cummins Onan — factory warranty
- Free shipping (contiguous US)
- Part Number: A058U955
Frequently asked questions
Does the price include installation?+
No — the online price covers the unit shipped free to the lower 48. Professional installation is available in NC & SC on a quote basis; outside that area we'll help you find a qualified local installer.
How fast does it ship?+
Free curbside / liftgate shipping to the contiguous 48 states. Most orders leave the warehouse in 3–5 business days.
What warranty is included?+
5-year limited factory warranty, registered and supported directly through Cummins.
Is financing available?+
Yes — 0% APR financing is available on qualifying orders. Ask us for details before checkout.
Free curbside shipping
Liftgate delivery to the lower 48. Most orders leave the warehouse in 3–5 business days.
Install help, no upsell
We size, spec, and connect you with a vetted local installer — or talk your contractor through it for free.
Real Cummins warranty
Full 5-year limited warranty — registered and supported through Cummins directly.