Skip to content

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 P03631
  • Yamaha EF5500D
  • Model P03631
    Model P03631

    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 P03631Yamaha EF5500D
General
Product type
Generator
Generator
Fuel
Gasoline
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyYesNo
Running watts
3650 W
Winner: Winner: 4500 W
Starting watts
4450 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)
24.8 x 21.7 x 21.7
29.1 x 29 x 31.5 in
Electrical
Voltage (AC)
120/240
120/240V 60 Hz
Voltage (DC)
12
Not available
GFCI outletsYesYes
Covered outletsYesNo
Automatic Voltage RegulationYesYes
THD
<25% %
Not available
Engine
Engine
208 cc 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
4450 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
CARB, EPA, ANSI/PGMA G300-2023
CARB, EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
true
true
UPC
840876136317
Not available
Core / High-priority specs
Running Watts (Gasoline)
3650
4500
Starting Watts (Gasoline)
4450
5500
Runtime @ 50% Load (Gasoline)
14
13.5
AC Outlet Types
1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (TT-30R); 1x 120/240V 30A (L14-30R)
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
208 cc Firman Max-Pro Series OHV 4-stroke, cast iron sleeve
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
Not available
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesYes
Included equipment
Mobility Components
Yes
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 P03631 is a 3,650-watt gasoline generator built for homeowners, RV users, and outdoor enthusiasts who need reliable backup power without breaking portability limits. At this wattage, the unit can run a refrigerator, microwave, and several power tools simultaneously, or power an RV's air conditioning and appliances during camping trips. The 4,450-watt peak capacity handles the startup surge of compressors and air conditioners, which draw 2 to 3 times their running wattage on initial startup. The P03631 delivers 14 hours of runtime at 50% load from its 5-gallon tank, meaning a user can power essential devices through a full day and night without refueling. This runtime window makes it practical for weekend camping or a 24-hour power outage without the need for a second fuel run. The gasoline fuel type keeps refueling simple at any gas station, and the inclusion of a fuel gauge eliminates guesswork about tank level.
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 P03631
    14h at 50% load
Where to buy
Prices can change. We update these automatically.
Firman P03631
Store links
No links yet.
Yamaha EF5500D
Store links
No links yet.
Disclosure: Some links may be affiliate links. Specs and comparisons are never hidden.