Westinghouse iGen2800c vs Cummins Onan P2500i

Comparison Overview

Key takeaways

• Both generators produce 2200 running watts and operate at a quiet 52 dB
• Westinghouse iGen2800c offers 2800 starting watts versus the Cummins' 2500 starting watts
• Westinghouse iGen2800c runs up to 12 hours at 25% load, two hours longer than the Cummins
• Both weigh under 50 pounds and include inverter technology for clean power output
• Both carry 3-year warranties and use gasoline fuel
• Cummins Onan brings a well-established brand reputation, especially among RV owners

Best use cases

Choose the Westinghouse iGen2800c if you want the most surge power and longest runtime in this weight class. Its 2800 starting watts give you a better shot at starting demanding appliances like a small window AC unit, a sump pump, or a full-size refrigerator without tripping the overload protection. The 12-hour runtime at 25% load also makes it a strong pick for overnight home backup during a power outage, since you can keep essential circuits running without waking up to refuel. Campers and tailgaters who want to run multiple devices simultaneously will appreciate the extra headroom. The iGen2800c also earned a higher overall score of 6.74, reflecting its edge in key performance categories.

Choose the Cummins Onan P2500i if brand reputation and service infrastructure matter to you. Cummins Onan has decades of experience building generators for RVs and commercial applications, and their dealer and service network is extensive. If you already own a Cummins-powered RV or are familiar with the brand, sticking within the ecosystem can simplify maintenance and warranty claims. The P2500i is a perfectly capable generator for camping, tailgating, and light home backup, and its 2500 starting watts will handle most common loads without issue. At 48 pounds, it's essentially the same portability as the Westinghouse.

Both generators produce clean inverter power safe for sensitive electronics like laptops and phones. Both run at a quiet 52 dB, roughly the volume of a normal conversation, making either one a considerate choice at a campground. The tradeoff really comes down to whether you prioritize the extra surge watts and runtime of the Westinghouse or the brand pedigree and service backing of the Cummins.

Verdict & recommendation

If your priority is getting the most power and the longest runtime for your money, the Westinghouse iGen2800c is the stronger pick. Its 300-watt surge advantage and two extra hours of runtime at quarter load give it a measurable edge in everyday performance. If you value an established brand with deep roots in the generator industry and a wide service network, the Cummins Onan P2500i is a solid, reliable choice that won't disappoint.

For most buyers focused purely on specs and performance per dollar, the Westinghouse makes a compelling case. But neither generator is a bad choice. They share the same running wattage, noise level, weight class, and warranty length. Your decision may ultimately come down to brand preference, availability, and which one you can find at a better price.