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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
  • Generac #7723 iQ3500
  • Model W03661OF
    Model W03661OF

    Firman 3,650W Gas Generator

    3650W
    Running
    69 dB
    Noise
    View details
  • Model #7723 iQ3500
    Model #7723 iQ3500

    Generac 3,000W Gas Generator

    3000W
    Running
    0 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 W03661OFGenerac #7723 iQ3500
General
Product type
Generator
Generator
Fuel
Gasoline
Gasoline
InverterYesYes
Parallel capableYesYes
RV readyYesNo
Running watts
Winner: Winner: 3650 W
3000 W
Starting watts
Winner: Winner: 4500 W
3500 W
Noise (lower limit)
Winner: Winner: 69 dB
0 dB
Weight
Winner: Winner: 106 lbs
109.1 lbs
Run time @50% load
Not available
Winner: Winner: 8.9 h
Run time @25% load
25 h
14.1 h
Fuel tank
6 gal
2.6 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
24.5 x 24.1 x 23
23.7 x 18 x 21.7
Electrical
Voltage (AC)
120
120
Voltage (DC)
12
5
GFCI outletsNoNo
Covered outletsYesNo
Automatic Voltage RegulationYesYes
THD
3 %
<3% %
Engine
Engine
208 cc OHV 4-stroke, cast iron sleeve.
212 cc Generac OHV 4-stroke.
Alternator
Not available
Not available
Starting system
Recoil
Recoil, Electric
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
3650 W
Not available
Starting watts
4500 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
8.9 h
Run time @25% load
25 h
Not available
Other
Data center
Not available
Not available
Indicators
true
true
Compliance
CARB, EPA
EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Floating
Floating
UPC
840876136614
696471103922
Core / High-priority specs
Running Watts (Gasoline)
3650
Not available
Starting Watts (Gasoline)
4500
Not available
Runtime @ 50% Load (Gasoline)
Not available
8.9
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 (L5-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
OHV 4-stroke
Engine Displacement
208
212
Cylinder Sleeve
Cast iron sleeve
Not available
Engine Oil Type
Not available
10W-30 / SAE 30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
25
Not available
Runtime @ 50% Load (Gasoline)
Not available
8.9
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesYes
Included equipment
Starting Components
Not available
Oil, funnel, tool kit, and battery
Included Accessories
Oil, funnel, tool kit, RV adapter, battery charging cables, and wheel kit
Oil, funnel, tool kit, and battery
Warranty & identification
Commercial Warranty
3
3
Part Number
Not available
7723
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 Generac #7723 iQ3500 is a 3000-watt inverter generator that runs on gasoline and delivers 3500 starting watts. This mid-range unit powers essential household appliances, power tools, and recreational equipment without requiring a dedicated outlet adapter. The inverter technology keeps total harmonic distortion below 3%, making it safe for laptops and sensitive electronics.
  • Most Powerful
    Firman W03661OF
    3650W running
  • Quietest
    Firman W03661OF
    69 dB
  • Longest Runtime
    Generac #7723 iQ3500
    8.9h at 50% load
Where to buy
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Firman W03661OF
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Generac #7723 iQ3500
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