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| Specification | Firman T04073 | AIVOLT VS12000411 |
|---|---|---|
| General | ||
| Product type | Generator | Not available |
| Fuel | Tri-Fuel | Dual-Fuel |
| Inverter | No | Yes |
| Parallel capable | No | Yes |
| RV ready | No | No |
| Running watts | 4000 W | Winner: Winner: 9000 W |
| Starting watts | 5000 W | Winner: Winner: 11250 W |
| Noise (lower limit) | 67 dB | Winner: Winner: 60 dB |
| Weight | Winner: Winner: 123.4 lbs | 220 lbs |
| Run time @50% load | Winner: Winner: 12 h | Not available |
| Run time @25% load | 14 h | 19 h |
| Fuel tank | 5 gal | Not available |
| Fuel gauge | Yes | No |
| Approx. dimensions (L × W × H) | 29.8 x 27.5 x 26.1 | 28.43L x 26.38W x 29.65H |
| Electrical | ||
| Voltage (AC) | 120/240 | 120V/240V |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | Yes | Yes |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | Yes | No |
| THD | 11%-14% % | 3 % |
| Engine | ||
| Engine | 223 cc OHV 4-stroke, cast iron sleeve | 459cc 4-strokes OHV air-cooled |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Not available |
| Warranty | ||
| Warranty | 3 years | Not available |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 4000 W | 9000 W |
| Starting watts | 5000 W | 11250 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 | 14 h | Not available |
| Run time @25% load | Not available | 19 h |
| Natural gas | Not available | Not available |
| Running watts | 3200 W | Not available |
| Starting watts | 4000 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 | Not available | Not available |
| Propane | Not available | Not available |
| Running watts | 3600 W | 8450 W |
| Starting watts | 4500 W | 10570 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 | Not available |
| Run time @25% load | Not available | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | CARB, EPA, ANSI/PGMA G300-2023 | Approved by the EPA and CARB |
| Security | Not available | Not available |
| Spark arrestor | Yes | No |
| Neutral | true | Not available |
| UPC | 840876140734 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 4000 | 9000 |
| Running Watts (Propane) | 3600 | 8450 |
| Running Watts (Natural Gas) | 3200 | Not available |
| Starting Watts (Gasoline) | 5000 | 11250 |
| Starting Watts (Propane) | 4500 | 10570 |
| Starting Watts (Natural Gas) | 4000 | Not available |
| Runtime @ 50% Load (Gasoline) | 14 | Not available |
| Runtime @ 50% Load (Propane) | 9 | Not available |
| Runtime @ 25% Load (Gasoline) | Not available | 19 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R) | 2 120V 20A 5-20R GFCI outlets, 1 120V 30A L5-30R, 1 120V/240V 30A L14-30R, 1 120V/240V 50A 14-50R |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | 223 cc OHV 4-stroke | 4 Stroke |
| Engine Displacement | 223 | 459 |
| Cylinder Sleeve | cast iron | Not available |
| Alternator Winding Material | Not available | 100% copper |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | Not available | 19 |
| Runtime @ 50% Load (Gasoline) | 14 | Not available |
| Runtime @ 50% Load (Propane) | 9 | Not available |
| Outlets & connections | ||
| Transfer Switch Compatibility | Not available | Yes |
| Controls & display | ||
| Display Type | Not available | LED display |
| Idle Control System | Not available | Eco switch |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection, CO monitoring | Built-in overload protection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Starting Components | Recoil, Electric | Not available |
| Fuel Connection Components | Not available | LPG hose with regulator |
| Included Accessories | Oil, funnel, tool kit, propane hose, RV adapter, cover, battery, and wheel kit | Remote controller, battery charger, oil funnel, tool kits |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Additional specs | ||
| Summary | The Firman T04073 is a 4,000-watt tri-fuel generator that runs on gasoline, propane, or natural gas. On gasoline, it delivers 5,000 starting watts and 4,000 running watts, enough to power a refrigerator, microwave, and multiple household circuits simultaneously. On propane, output drops to 3,600 running watts, and on natural gas it falls to 3,200 running watts. This fuel flexibility means users can switch between sources based on availability and cost, a significant advantage during extended outages or in remote locations where one fuel type may be scarce.
The T04073 targets homeowners, RV owners, and job site operators who need reliable backup power without the commitment to a single fuel source. Its 5-gallon tank runs for 14 hours at 25% load on gasoline, translating to roughly one week of emergency backup if you run it a few hours per day. The unit includes a wheel kit, making it easier to position despite its 123.4-pound weight. | The AIVOLT VS12000411 is a dual-fuel generator with a rated wattage of 9000 and a peak wattage of 11250. It features a 459cc 4-stroke OHV engine and includes electric and remote start options. |