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  • Firman WT05571
  • Powermate PM9400E
  • Model WT05571
    Model WT05571

    Firman 5,500W Tri-Fuel Generator

    5500W
    Running
    67 dB
    Noise
    View details
  • Model PM9400E
    Model PM9400E

    Powermate 7,500W Gas Generator

    7500W
    Running
    0 dB
    Noise
    View details
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).
Generator Specifications Comparison
SpecificationFirman WT05571Powermate PM9400E
General
Product type
Generator
Generator
Fuel
Tri-Fuel
Gasoline
InverterYesNo
Parallel capableYesNo
RV readyYesNo
Running watts
5500 W
Winner: Winner: 7500 W
Starting watts
6850 W
Winner: Winner: 9400 W
Noise (lower limit)
Winner: Winner: 67 dB
0 dB
Weight
Winner: Winner: 131.4 lbs
188 lbs
Run time @50% load
Not available
Winner: Winner: 10 h
Run time @25% load
14.5 h
13 h
Fuel tank
5.3 gal
8 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
27.6 x 21.3 x 22.6
31 x 27 x 26.4
Electrical
Voltage (AC)
120/240
120/240
Voltage (DC)
12
Not available
GFCI outletsYesYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
3 %
Not available
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
3 years
Power by fuel
GasolineNot availableNot available
Running watts
5500 W
7500 W
Starting watts
6850 W
9400 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
13 h
Natural gasNot availableNot 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
PropaneNot availableNot 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
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Bonded to frame
true
UPC
840876155714
696471077827
Core / High-priority specs
Running Watts (Gasoline)
5500
7500
Running Watts (Propane)
5000
Not available
Running Watts (Natural Gas)
4500
Not available
Starting Watts (Gasoline)
6850
9400
Starting Watts (Propane)
6250
Not available
Starting Watts (Natural Gas)
5500
Not available
Runtime @ 50% Load (Gasoline)
Not available
10
Runtime @ 25% Load (Gasoline)
14.5
13
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) GFCI; 1x 120/240V 30A (L14-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
OHV 4-stroke
Engine Displacement
322
420
Cylinder Sleeve
cast iron sleeve
Not available
Engine Oil Type
Not available
10W-30 / SAE 30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
14.5
13
Runtime @ 50% Load (Gasoline)
Not available
10
Safety & compliance
Overload Protection System
Low oil and overload protection, CO monitoring
Low oil and overload protection
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesNo
Included equipment
Starting Components
Oil, funnel, tool kit, propane hose, and battery
Oil, battery charger, battery, and wheel kit
Included Accessories
Oil, funnel, tool kit, propane hose, and battery
Oil, battery charger, battery, and wheel kit
Warranty & identification
Commercial Warranty
3
Not available
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 Powermate PM9400E is a portable generator offering 9,400 starting watts and 7,500 running watts, equipped with a Generac 420cc OHV engine and an 8-gallon fuel tank, providing up to 13 hours of runtime at 25% load.
  • Most Powerful
    Powermate PM9400E
    7500W running
  • Quietest
    Firman WT05571
    67 dB
  • Longest Runtime
    Powermate PM9400E
    10h at 50% load
Where to buy
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Firman WT05571
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Powermate PM9400E
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