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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
  • Cat INV2000
  • Model H03655
    Model H03655

    Firman 3,650W Dual-Fuel Generator

    3650W
    Running
    67 dB
    Noise
    View details
  • Model INV2000
    Model INV2000

    Cat 1,800W Gas Generator

    1800W
    Running
    52 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 H03655Cat INV2000
General
Product type
Generator
Generator
Fuel
Dual-Fuel
Gasoline
InverterNoYes
Parallel capableNoNo
RV readyYesNo
Running watts
Winner: Winner: 3650 W
1800 W
Starting watts
Winner: Winner: 4550 W
2250 W
Noise (lower limit)
67 dB
Winner: Winner: 52 dB
Weight
112 lbs
Winner: Winner: 48.8 lbs
Run time @50% load
Winner: Winner: 14 h
6 h
Run time @25% load
Not available
10 h
Fuel tank
5 gal
1 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
25.7 x 21.8 x 21.6
19.6 x 12.5 x 18.1
Electrical
Voltage (AC)
120V 60 Hz
120V 60 Hz
Voltage (DC)
Not available
12
GFCI outletsNoYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
25 %
<3% %
Engine
Engine
208 cc OHV 4-stroke, cast iron sleeve
OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil
Recoil
Warranty
Warranty
3 years
2 years
Power by fuel
GasolineNot availableNot available
Running watts
3650 W
1800 W
Starting watts
4550 W
2250 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
6 h
Run time @25% load
Not available
10 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
CARB, EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Floating
true
UPC
840876136553
815683024881
Core / High-priority specs
Running Watts (Gasoline)
3650
1800
Running Watts (Propane)
3300
Not available
Starting Watts (Gasoline)
4550
2250
Starting Watts (Propane)
4100
Not available
Runtime @ 50% Load (Gasoline)
14
6
Runtime @ 25% Load (Gasoline)
Not available
10
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) GFCI
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
208 cc OHV 4-stroke, cast iron sleeve
OHV 4-stroke
Engine Displacement
208
79.7
Cylinder Sleeve
cast iron sleeve
Not available
Engine Oil Type
Not available
SAE 30 or 10W-30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
Not available
10
Runtime @ 50% Load (Gasoline)
14
6
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesNo
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
Tool kit
Warranty & identification
Residential Warranty
3
Not available
Commercial Warranty
3
2
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 Cat INV2000 is an 1800-watt inverter generator built for users who need portable, clean power without the noise. At 48.8 pounds and measuring 19.6 x 12.5 x 18.1 inches, this unit bridges the gap between lightweight portability and genuine load capacity. It runs on standard gasoline and produces less than 3% THD, meaning laptops, phones, and sensitive electronics stay safe from voltage spikes. The recoil start fires up quickly, and the 52 dBA noise level keeps it quiet enough for residential areas and campgrounds. With 10 hours of runtime at 25% load and 6 hours at 50% load, users can power essential devices through a full day or night without refueling. The 1-gallon fuel tank and automatic low-oil shutdown mean less maintenance worry. This is a grab-and-go generator for camping, tailgating, emergency backup, and light outdoor work where portability matters as much as power.
  • Most Powerful
    Firman H03655
    3650W running
  • Quietest
    Cat INV2000
    52 dB
  • Longest Runtime
    Firman H03655
    14h at 50% load
Where to buy
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Firman H03655
Store links
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Cat INV2000
Store links
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