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| Specification | DuroStar DS11000DX | Ryobi RY909500 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Dual-Fuel | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | No |
| Running watts | Winner: Winner: 9000 W | 8000 W |
| Starting watts | Winner: Winner: 11000 W | 9500 W |
| Noise (lower limit) | Winner: Winner: 74 dB | 85 dB |
| Weight | 230 lbs | Winner: Winner: 198 lbs |
| Run time @50% load | Winner: Winner: 9 h | 7.5 h |
| Run time @25% load | 19 h | Not available |
| Fuel tank | 8.3 gal | 6 gal |
| Fuel gauge | Yes | No |
| Approx. dimensions (L × W × H) | 29 x 30 x 26 in | 31 x 29 x 24 |
| Electrical | ||
| Voltage (AC) | 120/240V 60 Hz | 120/240 |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | Yes | Yes |
| Covered outlets | No | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | Not available | <20% % |
| Engine | ||
| Engine | 457 cc OHV 4-stroke, cast iron sleeve | 500 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Recoil |
| Warranty | ||
| Warranty | 5 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 9000 W | 8000 W |
| Starting watts | 11000 W | 9500 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 h | 7.5 h |
| Run time @25% load | 19 h | Not available |
| Propane | Not available | Not available |
| Running watts | 8550 W | Not available |
| Starting watts | 10450 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 | 3.5 h | Not available |
| Run time @25% load | 7 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | false |
| Compliance | CARB, EPA | EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Not available | Bonded to frame |
| UPC | 811640016722 | 46396058553 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 9000 | 8000 |
| Running Watts (Propane) | 8550 | Not available |
| Starting Watts (Gasoline) | 11000 | 9500 |
| Starting Watts (Propane) | 10450 | Not available |
| Runtime @ 50% Load (Gasoline) | 9 | 7.5 |
| Runtime @ 50% Load (Propane) | 3.5 | Not available |
| Runtime @ 25% Load (Gasoline) | 19 | Not available |
| Runtime @ 25% Load (Propane) | 7 | Not available |
| AC Outlet Types | 2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R) | 2x Duplex 120V 20A (5-20R) GFCI1x 120/240V 30A (L14-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke, cast iron sleeve | 500 cc OHV 4-stroke |
| Engine Displacement | 457 | 500 |
| Cylinder Sleeve | cast iron sleeve | Not available |
| Alternator Winding Material | Copper windings | Not available |
| Engine Oil Type | 10W-30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 19 | Not available |
| Runtime @ 50% Load (Gasoline) | 9 | 7.5 |
| Runtime @ 50% Load (Propane) | 3.5 | Not available |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection, CO monitoring | Low oil and overload protection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Mobility Components | Wheel kit | Not available |
| Included Accessories | Funnel, tool kit, propane hose, battery, and wheel kit | Oil and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | Not available | 3 |
| Additional specs | ||
| Summary | The DuroStar DS11000DX is a 9,000-watt dual fuel generator built around a 457cc OHV engine with cast iron sleeves. This wattage places it squarely in the home backup and light job site category. On gasoline, it runs 9 hours at half load and 19 hours at quarter load. On propane, runtime drops to 3.5 hours at half load and 7 hours at quarter load, making gasoline the practical choice for extended outages. The dual fuel option gives users flexibility when propane is more accessible or economical, though gasoline delivers longer operating windows per tank. At 74 dB, the noise level sits in the moderate range for this power class, meaning it will be audible but not prohibitively loud in residential settings. The 8.3-gallon fuel tank combined with the quarter-load runtime means users can stretch a single fill to nearly a full day of light operation. | The Ryobi RY909500 is a 9500W Portable Gas Generator featuring a 500cc OHV engine, delivering 8000 running watts and 9500 starting watts. It offers a 7.5-hour runtime at 50% load, making it ideal for storm backup and jobsite use. |
