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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 W03661OF
  • Pulsar PG4500iSR
  • Model W03661OF
    Model W03661OF

    Firman 3,650W Gas Generator

    3650W
    Running
    69 dB
    Noise
    View details
  • Model PG4500iSR
    Model PG4500iSR

    Pulsar 3,700W Gas Generator

    3700W
    Running
    64 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 W03661OFPulsar PG4500iSR
General
Product type
Generator
Generator
Fuel
Gasoline
Gasoline
InverterYesYes
Parallel capableYesYes
RV readyYesYes
Running watts
3650 W
Winner: Winner: 3700 W
Starting watts
Winner: Winner: 4500 W
Winner: Winner: 4500 W
Noise (lower limit)
69 dB
Winner: Winner: 64 dB
Weight
106 lbs
Winner: Winner: 102 lbs
Run time @50% load
Not available
Winner: Winner: 7 h
Run time @25% load
25 h
Not available
Fuel tank
6 gal
3.2 gal
Fuel gaugeYesNo
Approx. dimensions (L × W × H)
24.5 x 24.1 x 23
26 x 24 x 28
Electrical
Voltage (AC)
120
120
Voltage (DC)
12
12
GFCI outletsNoNo
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
3 %
Not available
Engine
Engine
208 cc OHV 4-stroke, cast iron sleeve.
224 cc OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil
Recoil, Electric, Remote
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
3650 W
Not available
Starting watts
4500 W
4500 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
Not available
7 h
Run time @25% load
25 h
Not available
Other
Data center
Not available
Not available
Indicators
true
true
Compliance
CARB, EPA
CARB, EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Floating
Floating
UPC
840876136614
814726026059
Core / High-priority specs
Running Watts (Gasoline)
3650
Not available
Starting Watts (Gasoline)
4500
4500
Runtime @ 50% Load (Gasoline)
Not available
7
Runtime @ 25% Load (Gasoline)
25
Not available
AC Outlet Types
1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 50A (14-50R)
1x Duplex 120V 20A (5-20R); 1x 120V 30A (TT-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
OHV 4-stroke
Engine Displacement
208
224
Cylinder Sleeve
Cast iron sleeve
Not available
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
25
Not available
Runtime @ 50% Load (Gasoline)
Not available
7
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection
Low Oil ProtectionYesNo
Carbon Monoxide MonitoringYesNo
Included equipment
Starting Components
Not available
Recoil, Electric, Remote
Included Accessories
Oil, funnel, tool kit, RV adapter, battery charging cables, and wheel kit
Key fob and battery
Warranty & identification
Commercial Warranty
3
3
Additional specs
Summary
The Firman W03661OF is a 3650-watt inverter generator built around a 208cc OHV 4-stroke engine. This wattage class powers most household circuits simultaneously, including refrigerators, microwaves, and power tools, making it suitable for home backup and job site work. The gasoline fuel type and 6-gallon tank give users a familiar refueling experience without special infrastructure. Because this unit runs on standard fuel, users can source power anywhere gasoline is sold, a major advantage over propane or dual-fuel models. The inverter technology produces clean power at 3 percent THD, which means laptops, phones, and sensitive electronics charge safely without risk of voltage spikes.
The Pulsar PG4500iSR is a 4,500-watt inverter generator featuring a 224cc OHV engine, capable of up to 11 hours of runtime at half load on 3.2 gallons of fuel. It offers a wireless remote start, push-button start, and operates at approximately 64 dB. Its compact design includes a telescopic handle and 5-inch never-flat wheels for easy handling and storage.
  • Most Powerful
    Pulsar PG4500iSR
    3700W running
  • Quietest
    Pulsar PG4500iSR
    64 dB
  • Longest Runtime
    Pulsar PG4500iSR
    7h at 50% load
Where to buy
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Firman W03661OF
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Pulsar PG4500iSR
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