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Compare Generators Side-by-Side

Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.

  • Firman W03661OF
  • Ryobi RYi6522
  • Model W03661OF
    Model W03661OF

    Firman 3,650W Gas Generator

    3650W
    Running
    69 dB
    Noise
    View details
  • Model RYi6522
    Model RYi6522

    Ryobi 5,500W Gas Generator

    5500W
    Running
    72.3 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 W03661OFRyobi RYi6522
General
Product type
Generator
Generator
Fuel
Gasoline
Gasoline
InverterYesYes
Parallel capableYesNo
RV readyYesYes
Running watts
3650 W
Winner: Winner: 5500 W
Starting watts
4500 W
Winner: Winner: 6500 W
Noise (lower limit)
Winner: Winner: 69 dB
72.3 dB
Weight
Winner: Winner: 106 lbs
118 lbs
Run time @50% load
Not available
Winner: Winner: 8.5 h
Run time @25% load
25 h
Not available
Fuel tank
6 gal
4 gal
Fuel gaugeYesNo
Approx. dimensions (L × W × H)
24.5 x 24.1 x 23
24.4 x 20.9 x 22.5
Electrical
Voltage (AC)
120
120
Voltage (DC)
12
5
GFCI outletsNoYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
3 %
5 %
Engine
Engine
208 cc OHV 4-stroke, cast iron sleeve.
298 cc OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil
Recoil
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
3650 W
5500 W
Starting watts
4500 W
6500 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
8.5 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
true
UPC
840876136614
46396052193
Core / High-priority specs
Running Watts (Gasoline)
3650
5500
Starting Watts (Gasoline)
4500
6500
Runtime @ 50% Load (Gasoline)
Not available
8.5
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)
2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (TT-30R); 1x 120/240V 30A (L14-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
OHV 4-stroke
Engine Displacement
208
298
Cylinder Sleeve
Cast iron sleeve
Not available
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
25
Not available
Runtime @ 50% Load (Gasoline)
Not available
8.5
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection
Low Oil ProtectionYesNo
Carbon Monoxide MonitoringYesYes
Included equipment
Included Accessories
Oil, funnel, tool kit, RV adapter, battery charging cables, and wheel kit
Oil, tool kit, and wheel kit
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 Ryobi RYi6522 is a 6500-watt open frame inverter generator designed to provide reliable power for various applications, including RVs, home backup, and job sites. It features a 298cc OHV engine delivering 6500 starting watts and 5500 running watts, CO Detect carbon monoxide shutdown sensor for added safety, and Pure Sine Wave Technology to safely power sensitive electronics.
  • Most Powerful
    Ryobi RYi6522
    5500W running
  • Quietest
    Firman W03661OF
    69 dB
  • Longest Runtime
    Ryobi RYi6522
    8.5h at 50% load
Where to buy
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Firman W03661OF
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Ryobi RYi6522
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