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Compare Generators Side-by-Side

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

  • Firman P03631
  • Predator 72912
  • Model P03631
    Model P03631

    Firman 3,650W Gas Generator

    3650W
    Running
    75 dB
    Noise
    View details
  • Model 72912
    Model 72912

    Predator 3,500W Gas Generator

    3500W
    Running
    72.5 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 P03631Predator 72912
General
Product type
Generator
Generator
Fuel
Gasoline
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyYesNo
Running watts
Winner: Winner: 3650 W
3500 W
Starting watts
Winner: Winner: 4450 W
4375 W
Noise (lower limit)
75 dB
Winner: Winner: 72.5 dB
Weight
119.5 lbs
Winner: Winner: 107 lbs
Run time @50% load
14 h
Winner: Winner: 16 h
Run time @25% load
Not available
Not available
Fuel tank
5 gal
Not available
Fuel gaugeYesNo
Approx. dimensions (L × W × H)
24.8 x 21.7 x 21.7
23.3 x 18.6 x 19.23
Electrical
Voltage (AC)
120/240
120/240V
Voltage (DC)
12
Not available
GFCI outletsYesNo
Covered outletsYesNo
Automatic Voltage RegulationYesNo
THD
<25% %
Not available
Engine
Engine
208 cc Firman Max-Pro Series OHV 4-stroke, cast iron sleeve
Not available
Alternator
Not available
Not available
Starting system
Recoil, Electric, Remote
Not available
Warranty
Warranty
3 years
Not available
Power by fuel
GasolineNot availableNot available
Running watts
3650 W
Not available
Starting watts
4450 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
14 h
Not available
Run time @25% load
Not available
Not available
Other
Data center
Not available
Not available
Indicators
true
true
Compliance
CARB, EPA, ANSI/PGMA G300-2023
Not available
Security
Not available
Not available
Spark arrestorYesNo
Neutral
true
Not available
UPC
840876136317
Not available
Core / High-priority specs
Running Watts (Gasoline)
3650
Not available
Starting Watts (Gasoline)
4450
Not available
Runtime @ 50% Load (Gasoline)
14
Not available
AC Outlet Types
1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (TT-30R); 1x 120/240V 30A (L14-30R)
Not available
Electrical & power
Frequency
60
Not available
Engine & construction
Engine Type
208 cc Firman Max-Pro Series OHV 4-stroke, cast iron sleeve
Not available
Engine Displacement
208
212
Cylinder Sleeve
cast iron sleeve
Not available
Runtime & fuel system
Runtime @ 50% Load (Gasoline)
14
Not available
Safety & compliance
Overload Protection System
Low oil and overload protection
Not available
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesYes
Included equipment
Mobility Components
Yes
Not available
Included Accessories
Oil, funnel, tool kit, key fob, battery, and wheel kit
Not available
Warranty & identification
Commercial Warranty
3
Not available
Additional specs
Summary
The Firman P03631 is a 3,650-watt gasoline generator built for homeowners, RV users, and outdoor enthusiasts who need reliable backup power without breaking portability limits. At this wattage, the unit can run a refrigerator, microwave, and several power tools simultaneously, or power an RV's air conditioning and appliances during camping trips. The 4,450-watt peak capacity handles the startup surge of compressors and air conditioners, which draw 2 to 3 times their running wattage on initial startup. The P03631 delivers 14 hours of runtime at 50% load from its 5-gallon tank, meaning a user can power essential devices through a full day and night without refueling. This runtime window makes it practical for weekend camping or a 24-hour power outage without the need for a second fuel run. The gasoline fuel type keeps refueling simple at any gas station, and the inclusion of a fuel gauge eliminates guesswork about tank level.
The PREDATOR® 4375 Watt Portable Generator is designed for home backup during emergencies and powering tools at jobsites. It features a 212cc engine, CO SECURE® carbon monoxide shutdown for safety, and offers a runtime of up to 16 hours at 50% load.
  • Most Powerful
    Firman P03631
    3650W running
  • Quietest
    Predator 72912
    72.5 dB
  • Longest Runtime
    Predator 72912
    16h at 50% load
Where to buy
Prices can change. We update these automatically.
Firman P03631
Store links
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Predator 72912
Store links
No links yet.
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