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- Cummins Onan P9500DF EFI
- Powerhorse 2500i
Quick charts
Each chart uses its own Y-axis scale (so numbers are comparable within a chart).
Running watts
W
Starting watts
W
Noise
dB
Runtime @50%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
| Specification | Cummins Onan P9500DF EFI | Powerhorse 2500i |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Dual-Fuel | Gasoline |
| Inverter | No | Yes |
| Parallel capable | No | Yes |
| RV ready | No | No |
| Running watts | Winner: Winner: 7500 W | 1800 W |
| Starting watts | Winner: Winner: 9500 W | 2500 W |
| Noise (lower limit) | 74 dB | Winner: Winner: 62 dB |
| Weight | 211.6 lbs | Winner: Winner: 48.3 lbs |
| Run time @50% load | Winner: Winner: 9.6 h | 9.5 h |
| Run time @25% load | 14.4 h | 10.5 h |
| Fuel tank | 6.6 gal | 1.2 gal |
| Fuel gauge | Yes | No |
| Approx. dimensions (L × W × H) | 27.3 x 20.6 x 22.6 | 20.4 x 12.5 x 18.3 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120 |
| Voltage (DC) | 5 | Not available |
| GFCI outlets | Yes | No |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 23 % | 3 % |
| Engine | ||
| Engine | 420 cc OHV 4-stroke | 80 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric, Remote | Recoil |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 7500 W | Not available |
| Starting watts | 9500 W | 2500 W |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | 9.6 h | 9.5 h |
| Run time @25% load | 14.4 h | 10.5 h |
| Propane | Not available | Not available |
| Running watts | 6750 W | Not available |
| Starting watts | 8550 W | Not available |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | Not available | Not available |
| Run time @25% load | 10.8 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | false | true |
| Compliance | CARB, EPA, ANSI/PGMA G300-2023 | EPA, ANSI/PGMA G300-2023 |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | true | Floating |
| UPC | Not available | 840321763969 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 7500 | Not available |
| Running Watts (Propane) | 6750 | Not available |
| Starting Watts (Gasoline) | 9500 | 2500 |
| Starting Watts (Propane) | 8550 | Not available |
| Runtime @ 50% Load (Gasoline) | 9.6 | 9.5 |
| Runtime @ 25% Load (Gasoline) | 14.4 | 10.5 |
| Runtime @ 25% Load (Propane) | 10.8 | Not available |
| AC Outlet Types | 2x Duplex 120V 20A (5-20R) GFCI; 1x 120/240V 30A (L14-30R) | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke | 80 cc OHV 4-stroke |
| Engine Displacement | 420 | 80 |
| Engine Oil Type | SAE10W30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 14.4 | 10.5 |
| Runtime @ 50% Load (Gasoline) | 9.6 | 9.5 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Low oil and overload protection, CO monitoring |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Mobility Components | Yes | Not available |
| Included Accessories | Oil, funnel, tool kit, key fob, propane hose, battery, and wheel kit | Funnel and tool kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | 2 |
| Part Number | A075C509 | Not available |
| Additional specs | ||
| Summary | The Cummins Onan P9500DF EFI is a 7,500-watt dual-fuel generator built for users who need sustained power across multiple load types. On gasoline, it delivers 7,500 running watts and 9,500 peak watts. On propane, it drops to 6,750 running watts and 8,550 peak watts, which means propane users sacrifice roughly 10 percent of output but gain extended storage life and cleaner emissions. The electronic fuel injection engine handles high-altitude operation up to 13,123 feet without modification, making it viable for mountain jobsites, remote cabins, and RV camps where carbureted engines would struggle. At 211.6 pounds with an included wheel kit, this generator demands stationary placement or two-person handling, but the 6.6-gallon fuel tank stretches runtime to 14.4 hours at 25 percent load on gasoline. This is a workhorse for contractors, emergency backup, and off-grid scenarios where fuel flexibility and durability matter more than portability. | The Powerhorse 2500i is a portable inverter generator delivering 2,500 surge watts and 1,800 rated watts, featuring a quiet 52dB operation, CO shutdown function, and parallel-ready design for increased power needs. |
- Most PowerfulCummins Onan P9500DF EFI7500W running
- QuietestPowerhorse 2500i62 dB
- Longest RuntimeCummins Onan P9500DF EFI9.6h at 50% load
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Cummins Onan P9500DF EFI
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