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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 WH03662OF
  • Aceup Energy AI4500
  • Model WH03662OF
    Model WH03662OF

    Firman 3,650W Dual-Fuel Generator

    3650W
    Running
    69 dB
    Noise
    View details
  • Model AI4500
    Model AI4500

    Aceup Energy 3,600W 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 WH03662OFAceup Energy AI4500
General
Product type
Generator
Not available
Fuel
Dual-Fuel
Not available
InverterYesYes
Parallel capableYesYes
RV readyYesNo
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
119 lbs
Winner: Winner: 62.7 lbs
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
120V
Voltage (DC)
12
12V
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, Electric
Not available
Warranty
Warranty
3 years
2 years
Power by fuel
GasolineNot availableNot available
Running watts
3650 W
3600 W
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
Not available
Run time @25% load
25 h
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
19 h
Not available
Other
Data center
Not available
Not available
Indicators
true
true
Compliance
CARB, EPA, ANSI/PGMA G300-2023
EPA compliant
Security
Not available
Not available
Spark arrestorYesNo
Neutral
Floating
Not available
UPC
840876136621
Not available
Core / High-priority specs
Running Watts (Gasoline)
3650
3600
Running Watts (Propane)
3300
Not available
Starting Watts (Gasoline)
4500
4500
Starting Watts (Propane)
4100
Not available
Runtime @ 25% Load (Gasoline)
25
10
Runtime @ 25% Load (Propane)
19
Not available
AC Outlet Types
1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 50A (14-50R)
Two 20A outlets and one 30A Twist-Lock
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
4-stroke OHV
Engine Displacement
208
223
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
25
10
Controls & display
Display Type
Not available
Intelligent gauge
Idle Control System
Not available
Economic mode to save fuel
Safety & compliance
Low Oil ProtectionYesNo
Carbon Monoxide MonitoringYesNo
Included equipment
Starting Components
Not available
5-in-1 knob: fuel on/shut-off, engine on/off, choke
Included Accessories
Oil, funnel, tool kit, propane hose, RV adapter, battery charging cables, battery, and wheel kit
Not available
Warranty & identification
Residential Warranty
Not available
2
Commercial Warranty
3
2
Part Number
Not available
AI4500
Additional specs
Summary
The Firman WH03662OF is a 3,650-watt dual-fuel inverter generator built for both home backup and job site work. On gasoline, it delivers 4,500 starting watts and 3,650 running watts. On propane, output drops to 4,100 starting and 3,300 running watts. This wattage range powers most household appliances, mid-size power tools, and multiple devices simultaneously. The dual-fuel option gives users flexibility during fuel shortages or when propane's longer shelf life matters. Because the WH03662OF runs at 69 dBA, placement within 20 to 30 feet of living spaces remains practical for residential use. The inverter produces less than 3% THD, which protects laptops, TVs, and other sensitive electronics from voltage spikes. A 6-gallon tank delivers 25 hours of runtime at 25% load on gasoline and 19 hours on propane. At 50% load, runtime drops to zero hours, meaning users refuel frequently under moderate-to-heavy demand.
The Aceup Energy AI4500 is a 3,600-watt inverter generator built around a 223cc 4-stroke OHV engine. It produces 3,600 running watts and 4,500 peak watts, making it suitable for home backup of essentials, jobsite tools with moderate surge needs, and applications where clean power matters. As an inverter model, it delivers stable electricity to sensitive electronics like laptops, chargers, and networking gear while handling traditional household loads and motor starts. The 2.65-gallon fuel tank and 10-hour runtime at 25 percent load support overnight run windows for light to moderate demand. Parallel capability lets users connect two units later to increase total output without replacing the generator entirely.
  • Most Powerful
    Firman WH03662OF
    3650W running
  • Quietest
    Firman WH03662OF
    69 dB
  • Longest Runtime
    h at 50% load
Where to buy
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Firman WH03662OF
Store links
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Aceup Energy AI4500
Store links
No links yet.
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