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Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.

  • Firman WT05571
  • Predator 72920
  • Model WT05571
    Model WT05571

    Firman 5,500W Tri-Fuel Generator

    5500W
    Running
    67 dB
    Noise
    View details
  • Model 72920
    Model 72920

    Predator 5,500W Gas Generator

    5500W
    Running
    73.5 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 WT05571Predator 72920
General
Product type
Generator
Generator
Fuel
Tri-Fuel
Gasoline
InverterYesNo
Parallel capableYesNo
RV readyYesNo
Running watts
Winner: Winner: 5500 W
Winner: Winner: 5500 W
Starting watts
Winner: Winner: 6850 W
6500 W
Noise (lower limit)
Winner: Winner: 67 dB
73.5 dB
Weight
Winner: Winner: 131.4 lbs
165 lbs
Run time @50% load
Not available
Winner: Winner: 14.5 h
Run time @25% load
14.5 h
Not available
Fuel tank
5.3 gal
Not available
Fuel gaugeYesNo
Approx. dimensions (L × W × H)
27.6 x 21.3 x 22.6
26-7/8 x 22 x 22-3/4
Electrical
Voltage (AC)
120/240
120/240V
Voltage (DC)
12
Not available
GFCI outletsYesNo
Covered outletsYesNo
Automatic Voltage RegulationYesNo
THD
3 %
Not available
Engine
Engine
322 cc OHV 4-stroke, cast iron sleeve.
Not available
Alternator
Not available
Not available
Starting system
Recoil, Electric
Not available
Warranty
Warranty
3 years
Not available
Power by fuel
GasolineNot availableNot available
Running watts
5500 W
Not available
Starting watts
6850 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
14.5 h
Not available
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
Not available
Compliance
EPA, ANSI/PGMA G300-2023
Not available
Security
Not available
Not available
Spark arrestorYesNo
Neutral
Bonded to frame
Not available
UPC
840876155714
Not available
Core / High-priority specs
Running Watts (Gasoline)
5500
Not available
Running Watts (Propane)
5000
Not available
Running Watts (Natural Gas)
4500
Not available
Starting Watts (Gasoline)
6850
Not available
Starting Watts (Propane)
6250
Not available
Starting Watts (Natural Gas)
5500
Not available
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)
Not available
Electrical & power
Frequency
60
Not available
Engine & construction
Engine Type
OHV 4-stroke
Not available
Engine Displacement
322
301
Cylinder Sleeve
cast iron sleeve
Not available
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
14.5
Not available
Safety & compliance
Overload Protection System
Low oil and overload protection, CO monitoring
Not available
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesYes
Included equipment
Starting Components
Oil, funnel, tool kit, propane hose, and battery
Not available
Included Accessories
Oil, funnel, tool kit, propane hose, and battery
Not available
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 PREDATOR® 6500 Watt Portable Generator is designed for home backup during emergencies and powering tools at jobsites. It features a 301cc gas engine, GFCI outlets, and CO SECURE® carbon monoxide shutdown for safety.
  • Most Powerful
    Firman WT05571
    5500W running
  • Quietest
    Firman WT05571
    67 dB
  • Longest Runtime
    Predator 72920
    14.5h at 50% load
Where to buy
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Firman WT05571
Store links
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Predator 72920
Store links
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