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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
  • Aceup Energy AI4500W
  • Model W03661OF
    Model W03661OF

    Firman 3,650W Gas Generator

    3650W
    Running
    69 dB
    Noise
    View details
  • Model AI4500W
    Model AI4500W

    Aceup Energy 3,600W Gas Inverter Generator

    3600W
    Running
    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 @25%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
Generator Specifications Comparison
SpecificationFirman W03661OFAceup Energy AI4500W
General
Product type
Generator
Not available
Fuel
Gasoline
Gasoline
InverterYesYes
Parallel capableYesYes
RV readyYesYes
Running watts
Winner: Winner: 3650 W
3600 W
Starting watts
Winner: Winner: 4500 W
Winner: Winner: 4500 W
Noise (lower limit)
Winner: Winner: 69 dB
Not available
Weight
Winner: Winner: 106 lbs
Not available
Run time @50% load
Not available
Not available
Run time @25% load
Winner: Winner: 25 h
10 h
Fuel tank
6 gal
2.65 gal
Fuel gaugeYesNo
Approx. dimensions (L × W × H)
24.5 x 24.1 x 23
Not available
Electrical
Voltage (AC)
120
120
Voltage (DC)
12
12
GFCI outletsNoNo
Covered outletsYesNo
Automatic Voltage RegulationYesNo
THD
3 %
Not available
Engine
Engine
208 cc OHV 4-stroke, cast iron sleeve.
223cc 4-stroke OHV engine
Alternator
Not available
Not available
Starting system
Recoil
Not available
Warranty
Warranty
3 years
2 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
Not available
Run time @25% load
25 h
10 h
Other
Data center
Not available
Not available
Indicators
true
true
Compliance
CARB, EPA
EPA compliant
Security
Not available
Not available
Spark arrestorYesNo
Neutral
Floating
Not available
UPC
840876136614
Not available
Core / High-priority specs
Running Watts (Gasoline)
3650
Not available
Starting Watts (Gasoline)
4500
Not available
Runtime @ 25% Load (Gasoline)
25
10
AC Outlet Types
1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 50A (14-50R)
Two 120V AC 20A outlets and one 30A RV outlet
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
Not available
Engine Displacement
208
223
Cylinder Sleeve
Cast iron sleeve
Not available
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
25
10
Controls & display
Idle Control System
Not available
Economic mode to save fuel
Safety & compliance
Overload Protection System
Low oil and overload protection
Not available
Low Oil ProtectionYesNo
Carbon Monoxide MonitoringYesNo
Included equipment
Included Accessories
Oil, funnel, tool kit, RV adapter, battery charging cables, and wheel kit
Car charger adapter (two 5V USB ports)
Warranty & identification
Residential Warranty
Not available
2
Commercial Warranty
3
Not available
Part Number
Not available
AI4500W
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 Aceup Energy AI4500W is a gasoline-powered inverter generator with a rated wattage of 3600 and a peak wattage of 4500. It features recoil start and EPA compliance.
  • Most Powerful
    Firman W03661OF
    3650W running
  • Quietest
    Firman W03661OF
    69 dB
  • Longest Runtime
    h at 50% load
Where to buy
Prices can change. We update these automatically.
Firman W03661OF
Store links
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Aceup Energy AI4500W
Store links
No links yet.
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