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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 H03655
  • Genmax GM3300i
  • Model H03655
    Model H03655

    Firman 3,650W Dual-Fuel Generator

    3650W
    Running
    67 dB
    Noise
    View details
  • Model GM3300i
    Model GM3300i

    Genmax 3,000W Gas Generator

    3000W
    Running
    62 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 H03655Genmax GM3300i
General
Product type
Generator
Generator
Fuel
Dual-Fuel
Gasoline
InverterNoYes
Parallel capableNoYes
RV readyYesYes
Running watts
Winner: Winner: 3650 W
3000 W
Starting watts
Winner: Winner: 4550 W
3300 W
Noise (lower limit)
67 dB
Winner: Winner: 62 dB
Weight
112 lbs
Winner: Winner: 47.4 lbs
Run time @50% load
Winner: Winner: 14 h
4.5 h
Run time @25% load
Not available
6 h
Fuel tank
5 gal
1 gal
Fuel gaugeYesNo
Approx. dimensions (L × W × H)
25.7 x 21.8 x 21.6
18.9 x 11.4 x 17.3
Electrical
Voltage (AC)
120V 60 Hz
120
Voltage (DC)
Not available
5
GFCI outletsNoNo
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
25 %
Not available
Engine
Engine
208 cc OHV 4-stroke, cast iron sleeve
145 cc Dinking OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil
Recoil
Warranty
Warranty
3 years
1 years
Power by fuel
GasolineNot availableNot available
Running watts
3650 W
3000 W
Starting watts
4550 W
3300 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
14 h
4.5 h
Run time @25% load
Not available
6 h
PropaneNot availableNot available
Running watts
3300 W
Not available
Starting watts
4100 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
Other
Data center
Not available
Not available
Indicators
false
true
Compliance
EPA, ANSI/PGMA G300-2023
EPA, ANSI/PGMA G300-2023
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Floating
Floating
UPC
840876136553
768494056087
Core / High-priority specs
Running Watts (Gasoline)
3650
3000
Running Watts (Propane)
3300
Not available
Starting Watts (Gasoline)
4550
3300
Starting Watts (Propane)
4100
Not available
Runtime @ 50% Load (Gasoline)
14
4.5
Runtime @ 25% Load (Gasoline)
Not available
6
AC Outlet Types
1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 30A (TT-30R)
1x Duplex 120V 20A (5-20R) 1x 120V 30A (TT-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
208 cc OHV 4-stroke, cast iron sleeve
Dinking OHV 4-stroke
Engine Displacement
208
145
Cylinder Sleeve
cast iron sleeve
Not available
Engine Oil Type
Not available
10W-30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
Not available
6
Runtime @ 50% Load (Gasoline)
14
4.5
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection, CO monitoring
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesYes
Included equipment
Starting Components
Oil, funnel, tool kit, propane hose, and wheel kit
Not available
Included Accessories
Oil, funnel, tool kit, propane hose, and wheel kit
Funnel and tool kit
Warranty & identification
Residential Warranty
3
Not available
Commercial Warranty
3
Not available
Part Number
Not available
GE-3300A
Additional specs
Summary
The Firman H03655 is a 3,650-watt dual-fuel generator built around a 208 cc OHV 4-stroke engine with a cast iron sleeve. Running on gasoline, it delivers 4,550 starting watts and 3,650 running watts. Switch to propane and output drops to 4,100 starting watts and 3,300 running watts. This power level runs a refrigerator, microwave, window air conditioner, or multiple power tools simultaneously. The dual-fuel flexibility means you can operate on whichever fuel is available, a practical advantage during extended outages or when propane storage is more convenient than gasoline. At 67 dB at quarter load, the H03655 operates quietly enough for residential neighborhoods without disturbing neighbors. The 5-gallon tank delivers 14 hours of runtime at 50 percent load on gasoline, translating to roughly one full day of moderate use before refueling. The RV-ready configuration and included wheel kit position this unit as a go-anywhere power source for camping, job sites, and home backup scenarios.
The Genmax GM3300i is a 3000-watt gasoline inverter generator built for portability and clean power. At 47.4 lbs, it moves easily between campsites, job sites, and homes. The 3300-watt peak output handles startup surges on power tools and appliances, while the inverter technology protects laptops and phones from voltage spikes.
  • Most Powerful
    Firman H03655
    3650W running
  • Quietest
    Genmax GM3300i
    62 dB
  • Longest Runtime
    Firman H03655
    14h at 50% load
Where to buy
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Firman H03655
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Genmax GM3300i
Store links
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