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

  • Briggs & Stratton 30742
  • Firman P08008
  • Model 30742
    Model 30742

    Briggs & Stratton 8,000W Gas Generator

    8000W
    Running
    0 dB
    Noise
    View details
  • Model P08008
    Model P08008

    Firman 8,000W Gas Generator

    8000W
    Running
    74 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
SpecificationBriggs & Stratton 30742Firman P08008
General
Product type
Generator
Generator
Fuel
Gasoline
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyNoYes
Running watts
Winner: Winner: 8000 W
Winner: Winner: 8000 W
Starting watts
Winner: Winner: 10000 W
Winner: Winner: 10000 W
Noise (lower limit)
0 dB
Winner: Winner: 74 dB
Weight
246 lbs
Winner: Winner: 208 lbs
Run time @50% load
9 h
Winner: Winner: 12 h
Run time @25% load
Not available
Not available
Fuel tank
7.5 gal
8 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
28.4 x 30.5 x 29.1
27.1 x 27.5 x 26.8
Electrical
Voltage (AC)
120/240
120/240
Voltage (DC)
Not available
Not available
GFCI outletsYesYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
Not available
25 %
Engine
Engine
Briggs & Stratton OHV 4-stroke
439 cc Firman Max-Pro Series 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
GasolineNot availableNot available
Running watts
8000 W
8000 W
Starting watts
10000 W
10000 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
12 h
Run time @25% load
Not available
Not available
Other
Data center
Not available
Not available
Indicators
false
true
Compliance
EPA
EPA, ANSI/PGMA G300-2023
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Bonded to frame
true
UPC
11675307424
840876180082
Core / High-priority specs
Running Watts (Gasoline)
8000
8000
Starting Watts (Gasoline)
10000
10000
Runtime @ 50% Load (Gasoline)
9
12
AC Outlet Types
2x Duplex 120V 20A (5-20R) GFCI; 1x 120/240V 30A (L14-30R)
1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
Briggs & Stratton OHV 4-stroke
OHV 4-stroke, cast iron sleeve
Engine Displacement
420
439
Cylinder Sleeve
Not available
Cast iron sleeve
Runtime & fuel system
Runtime @ 50% Load (Gasoline)
9
12
Safety & compliance
Overload Protection System
Low oil and overload protection, CO monitoring
Low oil and overload protection
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesYes
Included equipment
Starting Components
Recoil, Electric
Recoil, Electric, Remote
Included Accessories
Oil, battery, and wheel kit
Oil, funnel, tool kit, key fob, RV adapter, battery, and wheel kit
Warranty & identification
Commercial Warranty
3
3
Additional specs
Summary
The Briggs & Stratton 30742 is an 8,000-watt gasoline generator built for job sites and home backup power. Its 10,000-watt peak output handles motor startup surges, while the dual-voltage 120/240V configuration powers both household circuits and heavy equipment like air compressors or welders.
The Firman P08008 is an 8,000-watt gas generator built for job sites, emergency backup, and outdoor events where sustained power matters more than portability. At 8,000 running watts and 10,000 peak watts, this unit can run a refrigerator, microwave, and power tools simultaneously, or handle the electrical load of a small RV. The 439cc cast-iron-sleeve engine burns gasoline, a fuel readily available at any gas station, and runs for 12 hours at half load on an 8-gallon tank. This runtime window means a single refueling cycle covers an overnight power outage or a full day of outdoor work.
  • Most Powerful
    Briggs & Stratton 30742
    8000W running
  • Quietest
    Firman P08008
    74 dB
  • Longest Runtime
    Firman P08008
    12h at 50% load
Where to buy
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Briggs & Stratton 30742
Store links
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Firman P08008
Store links
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