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- Firman WT05571
- Powerhorse s9500d
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 | Firman WT05571 | Powerhorse s9500d |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Tri-Fuel | Dual-Fuel |
| Inverter | Yes | No |
| Parallel capable | Yes | No |
| RV ready | Yes | No |
| Running watts | 5500 W | Winner: Winner: 7500 W |
| Starting watts | 6850 W | Winner: Winner: 9500 W |
| Noise (lower limit) | Winner: Winner: 67 dB | 97 dB |
| Weight | Winner: Winner: 131.4 lbs | 220 lbs |
| Run time @50% load | Not available | Winner: Winner: 10 h |
| Run time @25% load | 14.5 h | Not available |
| Fuel tank | 5.3 gal | 6.6 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 27.6 x 21.3 x 22.6 | 29.3 x 26.7 x 26.4 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240V 60 Hz |
| Voltage (DC) | 12 | 5V |
| GFCI outlets | Yes | Yes |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 3 % | <23% % |
| Engine | ||
| Engine | 322 cc OHV 4-stroke, cast iron sleeve. | 420 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Recoil, Electric |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 5500 W | 7500 W |
| Starting watts | 6850 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 | Not available | 10 h |
| Run time @25% load | 14.5 h | Not available |
| Natural gas | Not available | Not available |
| Running watts | 4500 W | Not available |
| Starting watts | 5500 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 | 5000 W | 6750 W |
| Starting watts | 6250 W | 8550 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 | Not available | 5 h |
| Run time @25% load | 9.5 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | Not available | true |
| Compliance | EPA, ANSI/PGMA G300-2023 | EPA, ANSI/PGMA G300-2023 |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Bonded to frame | Bonded to frame |
| UPC | 840876155714 | 840321763990 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 5500 | 7500 |
| Running Watts (Propane) | 5000 | 6750 |
| Running Watts (Natural Gas) | 4500 | Not available |
| Starting Watts (Gasoline) | 6850 | 9500 |
| Starting Watts (Propane) | 6250 | 8550 |
| Starting Watts (Natural Gas) | 5500 | Not available |
| Runtime @ 50% Load (Gasoline) | Not available | 10 |
| Runtime @ 50% Load (Propane) | Not available | 5 |
| Runtime @ 25% Load (Gasoline) | 14.5 | Not available |
| Runtime @ 25% Load (Propane) | 9.5 | Not available |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (TT-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R) | 2x 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 | OHV 4-stroke | 420 cc OHV 4-stroke |
| Engine Displacement | 322 | 420 |
| Cylinder Sleeve | cast iron sleeve | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 14.5 | Not available |
| Runtime @ 50% Load (Gasoline) | Not available | 10 |
| Runtime @ 50% Load (Propane) | Not available | 5 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection, CO monitoring | Not available |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Mobility Components | Not available | Yes |
| Starting Components | Oil, funnel, tool kit, propane hose, and battery | Starting Components |
| Fuel Connection Components | Not available | propane hose |
| Included Accessories | Oil, funnel, tool kit, propane hose, and battery | Funnel, tool kit, propane hose, and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | 2 |
| Additional specs | ||
| Summary | The Firman WT05571 is a 5,500-watt tri-fuel generator that runs on gasoline, propane, or natural gas. On gasoline, it delivers 6,850 starting watts and 5,500 running watts, enough to power a full home electrical panel during an outage or run multiple job site tools simultaneously. On propane, output drops to 6,250 starting and 5,000 running watts. On natural gas, it falls to 5,500 starting and 4,500 running watts. This fuel flexibility means users can switch between sources based on availability, cost, or storage preference without buying multiple generators.
The tri-fuel capability makes this unit valuable for homeowners in regions with natural gas infrastructure, RV owners who can refill propane at any campground, and contractors who need to adapt to job site fuel availability. The 3 percent THD rating protects laptops, televisions, and other sensitive electronics from voltage spikes that damage circuits. At 67 decibels, the noise level sits between a typical conversation and heavy traffic, making it suitable for residential neighborhoods but audible enough that neighbors will know it is running. | The Powerhorse s9500d is a dual-fuel portable generator offering 9,500 surge watts and 7,500 rated watts, suitable for various applications including emergency power and outdoor events. |
- Most PowerfulPowerhorse s9500d7500W running
- QuietestFirman WT0557167 dB
- Longest RuntimePowerhorse s9500d10h at 50% load
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Firman WT05571
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Powerhorse s9500d
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