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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 P03628
  • Yamaha EF5500D
  • Model P03628
    Model P03628

    Firman 3,650W Gas Generator

    3650W
    Running
    75 dB
    Noise
    View details
  • Model EF5500D
    Model EF5500D

    Yamaha 4,500W Gas Generator

    4500W
    Running
    74.1 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 P03628Yamaha EF5500D
General
Product type
Generator
Generator
Fuel
Gasoline
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyYesNo
Running watts
3650 W
Winner: Winner: 4500 W
Starting watts
4550 W
Winner: Winner: 5500 W
Noise (lower limit)
75 dB
Winner: Winner: 74.1 dB
Weight
Winner: Winner: 119.5 lbs
216.1 lbs
Run time @50% load
Winner: Winner: 14 h
13.5 h
Run time @25% load
Not available
Not available
Fuel tank
5 gal
6.9 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
23.2 x 21.7 x 21.7
29.1 x 29 x 31.5 in
Electrical
Voltage (AC)
120
120/240V 60 Hz
Voltage (DC)
Not available
Not available
GFCI outletsNoYes
Covered outletsYesNo
Automatic Voltage RegulationYesYes
THD
25 %
Not available
Engine
Engine
Firman Max-Pro Series OHV 4-stroke, cast iron sleeve
Yamaha MZ360 OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil, Electric, Remote
Recoil
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
3650 W
4500 W
Starting watts
4550 W
5500 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
14 h
13.5 h
Run time @25% load
Not available
Not available
Other
Data center
Not available
Not available
Indicators
true
true
Compliance
EPA, ANSI/PGMA G300-2023
CARB, EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Floating
true
UPC
840876136287
Not available
Core / High-priority specs
Running Watts (Gasoline)
3650
4500
Starting Watts (Gasoline)
4550
5500
Runtime @ 50% Load (Gasoline)
14
13.5
AC Outlet Types
1x Duplex 120V 20A (5-20R) 1x 120V 30A (TT-30R) 1x 120V 30A (L5-30R)
2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
OHV 4-stroke
Engine Displacement
208
358
Cylinder Sleeve
Cast iron sleeve
Not available
Runtime & fuel system
Runtime @ 50% Load (Gasoline)
14
13.5
Safety & compliance
Overload Protection System
Low oil and overload protection, CO monitoring
Not available
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesYes
Included equipment
Mobility Components
Wheel kit
Yes
Included Accessories
Oil, funnel, tool kit, key fob, battery, and wheel kit
Tool kit and wheel kit
Warranty & identification
Commercial Warranty
3
Not available
Part Number
Not available
EF55DZ1
Additional specs
Summary
The Firman P03628 is a 3,650-watt running generator built on a 208cc OHV 4-stroke engine with cast iron sleeves. This wattage class handles mid-range household loads: refrigerators, window air conditioners, well pumps, and power tools, but not simultaneous heavy-draw appliances like central AC or electric ranges. The 4,550-watt peak gives it startup headroom for motors and compressors. Gasoline fuel means easy refueling at any station, and the 5-gallon tank stretches to 14 hours at half load, reducing refueling frequency on job sites or during extended outages. The RV-ready outlet configuration and remote start make this a practical choice for both emergency backup and recreational use.
The Yamaha EF5500D is a 5500-watt generator designed for emergency backup, recreational use, and DIY projects. It features a 358cc OHV engine, dual voltage output, and offers up to 9 hours of continuous operation at rated load.
  • Most Powerful
    Yamaha EF5500D
    4500W running
  • Quietest
    Yamaha EF5500D
    74.1 dB
  • Longest Runtime
    Firman P03628
    14h at 50% load
Where to buy
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Firman P03628
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Yamaha EF5500D
Store links
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