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

  • Sportsman GENMAX1500
  • Cat RP5500
  • Model GENMAX1500
    Model GENMAX1500

    Sportsman 900W Gas Generator

    900W
    Running
    65 dB
    Noise
    View details
  • Model RP5500
    Model RP5500

    Cat 5,500W Gas Generator

    5500W
    Running
    0 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
SpecificationSportsman GENMAX1500Cat RP5500
General
Product type
Generator
Generator
Fuel
Gasoline
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyNoNo
Running watts
900 W
Winner: Winner: 5500 W
Starting watts
1500 W
Winner: Winner: 6875 W
Noise (lower limit)
Winner: Winner: 65 dB
0 dB
Weight
Winner: Winner: 45 lbs
178 lbs
Run time @50% load
8 h
Winner: Winner: 15 h
Run time @25% load
Not available
Not available
Fuel tank
1 gal
7.9 gal
Fuel gaugeNoYes
Approx. dimensions (L × W × H)
16 x 14 x 16
32.9 x 27.4 x 24.7
Electrical
Voltage (AC)
120
120/240
Voltage (DC)
12
Not available
GFCI outletsNoYes
Covered outletsNoYes
Automatic Voltage RegulationNoYes
THD
Not available
Not available
Engine
Engine
72 cc 2-stroke
300 cc OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil
Recoil
Warranty
Warranty
1 years
2 years
Power by fuel
GasolineNot availableNot available
Running watts
900 W
5500 W
Starting watts
1500 W
6875 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
8 h
15 h
Run time @25% load
Not available
Not available
Other
Data center
Not available
Not available
Indicators
false
false
Compliance
EPA
CARB, EPA
Security
Not available
Not available
Spark arrestorNoYes
Neutral
Not available
Not available
UPC
27077805444
815683020036
Core / High-priority specs
Running Watts (Gasoline)
900
5500
Starting Watts (Gasoline)
1500
6875
Runtime @ 50% Load (Gasoline)
8
15
AC Outlet Types
1x Duplex 120V 20A (5-20R)
2x Duplex 120V 20A (5-20R) GFCI, 1x 120/240V 30A (L14-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
2-stroke
OHV 4-stroke
Engine Displacement
72
300
Engine Oil Type
Not available
SAE 30 or 10W-30
Runtime & fuel system
Runtime @ 50% Load (Gasoline)
8
15
Safety & compliance
Overload Protection System
Not available
Low oil and overload protection
Low Oil ProtectionNoYes
Included equipment
Included Accessories
Tool kit and battery charging cables
Oil, funnel, tool kit, and wheel kit
Warranty & identification
Part Number
Not available
502-3686
Additional specs
Summary
The Sportsman GENMAX1500 is a portable 2-cycle gasoline generator offering 1,500 surge watts and 900 running watts, suitable for powering common household appliances and power tools.
The Cat RP5500 is a 5500-watt gasoline generator built for homeowners, contractors, and outdoor enthusiasts who need reliable backup power without the complexity of larger units. This wattage tier handles most household circuits simultaneously, meaning you can run a refrigerator, well pump, and power tools at the same time, but not your entire home's air conditioning system. The 6875-watt peak capacity gives it the muscle to start high-inrush devices like compressors and sump pumps without stalling. Because the RP5500 runs on gasoline, fuel is available at any gas station, eliminating the supply chain friction of propane or diesel models. The 7.9-gallon tank paired with 15-hour runtime at half load means you refuel roughly once per day under typical use, not every few hours.
  • Most Powerful
    Cat RP5500
    5500W running
  • Quietest
    Sportsman GENMAX1500
    65 dB
  • Longest Runtime
    Cat RP5500
    15h at 50% load
Where to buy
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Sportsman GENMAX1500
Store links
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Cat RP5500
Store links
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