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| Specification | Cummins Onan P9500df | NorthStar c8000s |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Dual-Fuel | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | No | No |
| Running watts | Winner: Winner: 7500 W | 6600 W |
| Starting watts | Winner: Winner: 9500 W | 8000 W |
| Noise (lower limit) | 74 dB | Winner: Winner: 73 dB |
| Weight | Winner: Winner: 194 lbs | 280 lbs |
| Run time @50% load | Winner: Winner: 11 h | 10.6 h |
| Run time @25% load | 16 h | Not available |
| Fuel tank | 6.6 gal | 8 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 27.3 x 26.3 x 26.3 | 41 x 32 x 29 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240 |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | Yes | Yes |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 23 % | < 5% % |
| Engine | ||
| Engine | 420 cc Ducar OHV 4-stroke | Honda GX390 OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric, Remote | Recoil, Electric |
| Warranty | ||
| Warranty | 3 years | 4 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 7500 W | 6600 W |
| Starting watts | 9500 W | 8000 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 | 11 h | 10.6 h |
| Run time @25% load | 16 h | Not available |
| 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 | 8 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | false | false |
| Compliance | EPA | CARB, EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | true | true |
| UPC | 690781007932 | 840321737618 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 7500 | 6600 |
| Running Watts (Propane) | 6750 | Not available |
| Starting Watts (Gasoline) | 9500 | 8000 |
| Starting Watts (Propane) | 8550 | Not available |
| Runtime @ 50% Load (Gasoline) | 11 | 10.6 |
| Runtime @ 25% Load (Gasoline) | 16 | Not available |
| Runtime @ 25% Load (Propane) | 8 | Not available |
| AC Outlet Types | 2x Duplex 120V 20A (5-20R); 1x 120/240V 30A (L14-30R) | 3x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | Ducar OHV 4-stroke | OHV 4-stroke |
| Engine Displacement | 420 | 389 |
| Engine Oil Type | SAE 10W-30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 16 | Not available |
| Runtime @ 50% Load (Gasoline) | 11 | 10.6 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Low oil and overload protection. |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Included Accessories | Oil, funnel, tool kit, key fob, battery charger, propane hose, battery, and wheel kit | Funnel, Battery, and Wheel Kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Part Number | A074Z438 | Not available |
| Additional specs | ||
| Summary | The Cummins Onan P9500df is a 7500-watt dual-fuel generator built for users who need sustained power across multiple scenarios. Running on either gasoline or propane, it delivers 9500 peak watts, enough to start large air conditioning units or power multiple job site tools simultaneously. The dual-fuel architecture means users can switch between fuel sources based on availability and storage constraints. Propane tanks store longer without degradation, while gasoline offers wider accessibility. This flexibility makes the unit valuable for both seasonal backup power and year-round work environments.
The 194-pound weight and 27.3 x 26.3 x 26.3 inch footprint define this as a semi-portable unit. The included wheel kit enables movement across job sites or between storage locations, but this is not a grab-and-go machine. Users planning frequent relocation should factor in the logistical demands. The three-year commercial warranty covers manufacturing defects, giving buyers defined ownership support across the critical early-use period. | The NorthStar c8000s is a commercial-grade portable generator designed for demanding job sites, featuring a Honda GX390 OHV engine and Quiet Armor Technology for reduced noise. |
