Westinghouse iGen2800 vs Cummins Onan P2500i

Comparison Overview

Key takeaways

• Both produce 2200 running watts and operate at a quiet 52 dB noise level
• Westinghouse iGen2800 delivers 2800 starting watts, 300 more than the Cummins
• Westinghouse runs up to 12 hours at 25% load versus 10 hours for the Cummins
• Both are inverter generators safe for laptops, phones, and sensitive electronics
• Westinghouse weighs 46.3 lbs, slightly lighter than the Cummins at 48 lbs
• Both carry a 3-year warranty for long-term peace of mind

Best use cases

Choose the Westinghouse iGen2800 if you plan to power appliances with higher startup demands. Its 2800 starting watts give you an extra 300 watts of surge capacity over the Cummins, which can be the difference between successfully kicking on a small RV air conditioner or tripping the overload protection. The iGen2800 is also the better pick for situations where you want to run the generator overnight without refueling. With 12 hours of runtime at 25% load, it can keep a few lights, a fan, and a phone charger going through a full night of sleep during a power outage or a weekend campsite stay. At 46.3 lbs, it is also marginally lighter, making it slightly easier to load into a truck bed or carry to a tailgate.

Choose the Cummins Onan P2500i if brand heritage and dealer support matter to you. Cummins is a name deeply rooted in the power generation industry, and the Onan line has a long track record in the RV world specifically. If you already own Cummins products or have a local dealer relationship, parts and service may be more convenient. The P2500i delivers the same 2200 running watts and the same 52 dB noise level, so for everyday tasks like charging devices, running a portable heater, or powering a small campsite, it performs identically to the Westinghouse in practice.

Both generators are well suited for camping, tailgating, RV supplemental power, and light home backup. Neither is designed for heavy construction use or whole-house backup. If your typical load stays well under 2000 watts, you honestly won't notice a performance difference between them, and the decision may come down to price and availability in your area.

Verdict & recommendation

These two inverter generators share the same running wattage, noise level, and warranty length, making this one of the closer comparisons you will find. The Westinghouse iGen2800 pulls slightly ahead on paper with 300 more starting watts and roughly two extra hours of runtime at quarter load. If your priority is maximizing surge capacity for motor-driven loads or stretching fuel as long as possible between fill-ups, the iGen2800 is the stronger choice.

If your priority is brand trust and you value the Cummins name and its established service network, the Onan P2500i is a solid, reliable option that handles the same everyday tasks equally well. For most buyers powering a campsite, tailgate, or a few essentials during an outage, either generator will get the job done quietly and efficiently. Let price, availability, and personal brand preference be your tiebreaker.