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- Firman WT05571
- Honda EM6500SX
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 | Honda EM6500SX |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Tri-Fuel | Gasoline |
| Inverter | Yes | No |
| Parallel capable | Yes | No |
| RV ready | Yes | No |
| Running watts | Winner: Winner: 5500 W | Winner: Winner: 5500 W |
| Starting watts | Winner: Winner: 6850 W | 6500 W |
| Noise (lower limit) | 67 dB | Winner: Winner: 64 dB |
| Weight | Winner: Winner: 131.4 lbs | 231.7 lbs |
| Run time @50% load | Not available | Winner: Winner: 9.8 h |
| Run time @25% load | 14.5 h | Not available |
| Fuel tank | 5.3 gal | 6.2 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 27.6 x 21.3 x 22.6 | 41.4 x 27.8 x 28.3 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240 |
| Voltage (DC) | 12 | 12 |
| GFCI outlets | Yes | Yes |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 3 % | Not available |
| Engine | ||
| Engine | 322 cc OHV 4-stroke, cast iron sleeve. | Honda iGX390 OHV 4-stroke, cast iron sleeve |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Recoil, Electric, Remote |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 5500 W | 5500 W |
| Starting watts | 6850 W | 6500 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 | 9.8 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 | Not available |
| Starting watts | 6250 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 | 9.5 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | Not available | false |
| Compliance | EPA, ANSI/PGMA G300-2023 | EPA, ANSI/PGMA G300-2023 |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Bonded to frame | Floating |
| UPC | 840876155714 | 786102007429 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 5500 | 5500 |
| Running Watts (Propane) | 5000 | Not available |
| Running Watts (Natural Gas) | 4500 | Not available |
| Starting Watts (Gasoline) | 6850 | 6500 |
| Starting Watts (Propane) | 6250 | Not available |
| Starting Watts (Natural Gas) | 5500 | Not available |
| Runtime @ 50% Load (Gasoline) | Not available | 9.8 |
| 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) | AC outlets2x Duplex 120V 20A (5-20R) GFCI1x 120V 30A (L5-30R)1x 120/240V 30A (L14-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke | Honda iGX390 OHV 4-stroke, cast iron sleeve |
| Engine Displacement | 322 | 389 |
| Cylinder Sleeve | cast iron sleeve | Cast iron sleeve |
| Engine Oil Type | Not available | 10W-30 |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 14.5 | Not available |
| Runtime @ 50% Load (Gasoline) | Not available | 9.8 |
| 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 | ||
| Starting Components | Oil, funnel, tool kit, propane hose, and battery | Recoil, Electric, Remote |
| Included Accessories | Oil, funnel, tool kit, propane hose, and battery | Battery and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | 3 |
| Part Number | Not available | EM6500SXK2AN |
| 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 Honda EM6500SX is a 6500-watt generator equipped with an electric start, Bluetooth capability, and CO-MINDER for advanced carbon monoxide detection. It offers a long run time of up to 9.8 hours and can power a variety of household appliances. |
- Most PowerfulFirman WT055715500W running
- QuietestHonda EM6500SX64 dB
- Longest RuntimeHonda EM6500SX9.8h at 50% load
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Firman WT05571
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