Cummins Onan P2500i vs Ford FG2500iSCO

Comparison Overview

Key takeaways

• Both deliver 2200 running watts and 2500 starting watts with inverter power.
• Onan P2500i is much quieter at 52 dB versus Ford at 64 dB.
• Onan P2500i runs up to 10 hours at 25% load, 8 hours at 50%.
• Ford FG2500iSCO lists 6 hours runtime at 50% load, no 25% figure provided.
• Both are similarly portable, Onan weighs 48 lb and Ford weighs 48.7 lb.
• Onan includes a 3-year warranty, Ford includes a 2-year warranty.

Best use cases

Choose the Cummins Onan P2500i if you expect to run a generator near people and want it to fade into the background. At 52 dB, it is better suited for camping, tailgating, and RV use where generator noise can be the main complaint. The longer published runtimes, up to 10 hours at 25% load and 8 hours at 50% load, also fit overnight basics like a fridge, CPAP, fans, device charging, and intermittent microwave use, with fewer fuel stops. The 3-year warranty is a nice fit if you want a little more long term coverage for occasional seasonal use.

Choose the Ford FG2500iSCO if your use is more tolerant of noise, or the generator will sit farther from where you are spending time. At 64 dB, it can feel more at home in driveway tasks, light job site support (battery chargers, small tools), or as a compact backup option when you mainly need to keep essentials going for shorter windows. It still matches the Onan on the numbers that matter for capability, 2200 running watts and 2500 starting watts, and it is essentially the same carry weight at 48.7 lb.

The tradeoff is that Ford provides a shorter published runtime picture (listed 6 hours at 50% load, no 25% figure) and a 2-year warranty, so if you are planning long, quiet runs, the Onan tends to fit that lifestyle better.

Verdict & recommendation

If your priority is a quieter generator for camping, RVing, or any situation where neighbors are close, the Cummins Onan P2500i is the more comfortable pick thanks to its 52 dB rating and longer stated runtimes (up to 10 hours at 25% load). If your priority is simply getting the same compact inverter power level, 2200 running watts and 2500 starting watts, and you can place the unit farther away or you are less sensitive to noise, the Ford FG2500iSCO can still cover the same basic appliances and charging needs.

Both are similarly portable at about 48 lb, so the decision mostly comes down to how much you value quiet operation, published runtime confidence, and the extra year of warranty coverage. Pick based on where you will use it and how long you need it to run between refuels.