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.

  • DuroMax XP12000HX
  • Cat RP5500
  • Model XP12000HX
    Model XP12000HX

    DuroMax 9,500W Dual-Fuel Generator

    9500W
    Running
    74 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
SpecificationDuroMax XP12000HXCat RP5500
General
Product type
Generator
Generator
Fuel
Dual-Fuel
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyYesNo
Running watts
Winner: Winner: 9500 W
5500 W
Starting watts
Winner: Winner: 12000 W
6875 W
Noise (lower limit)
Winner: Winner: 74 dB
0 dB
Weight
230 lbs
Winner: Winner: 178 lbs
Run time @50% load
9 h
Winner: Winner: 15 h
Run time @25% load
19 h
Not available
Fuel tank
8.3 gal
7.9 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
29 x 30 x 26
32.9 x 27.4 x 24.7
Electrical
Voltage (AC)
120/240
120/240
Voltage (DC)
Not available
Not available
GFCI outletsYesYes
Covered outletsNoYes
Automatic Voltage RegulationYesYes
THD
Not available
Not available
Engine
Engine
457 cc OHV 4-stroke, cast iron sleeve
300 cc OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil, Electric
Recoil
Warranty
Warranty
5 years
2 years
Power by fuel
GasolineNot availableNot available
Running watts
9500 W
5500 W
Starting watts
12000 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
9 h
15 h
Run time @25% load
19 h
Not available
PropaneNot availableNot available
Running watts
9025 W
Not available
Starting watts
11400 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
3.5 h
Not available
Run time @25% load
7 h
Not available
Other
Data center
Not available
Not available
Indicators
true
false
Compliance
CARB, EPA
CARB, EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Not available
Not available
UPC
811640016227
815683020036
Core / High-priority specs
Running Watts (Gasoline)
9500
5500
Running Watts (Propane)
9025
Not available
Starting Watts (Gasoline)
12000
6875
Starting Watts (Propane)
11400
Not available
Runtime @ 50% Load (Gasoline)
9
15
Runtime @ 50% Load (Propane)
3.5
Not available
Runtime @ 25% Load (Gasoline)
19
Not available
Runtime @ 25% Load (Propane)
7
Not available
AC Outlet Types
2x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
2x Duplex 120V 20A (5-20R) GFCI, 1x 120/240V 30A (L14-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
OHV 4-stroke
Engine Displacement
457
300
Cylinder Sleeve
Cast iron sleeve
Not available
Alternator Winding Material
Copper windings
Not available
Engine Oil Type
Not available
SAE 30 or 10W-30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
19
Not available
Runtime @ 50% Load (Gasoline)
9
15
Runtime @ 50% Load (Propane)
3.5
Not available
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesNo
Included equipment
Starting Components
Recoil, Electric
Not available
Included Accessories
Funnel, tool kit, propane hose, battery, and wheel kit
Oil, funnel, tool kit, and wheel kit
Warranty & identification
Residential Warranty
5
Not available
Commercial Warranty
5
Not available
Part Number
Not available
502-3686
Additional specs
Summary
The DuroMax XP12000HX is a 9,500-watt dual-fuel generator built for job sites, home backup, and RV use. Its 12,000-watt peak capacity handles the startup surge of air conditioners, compressors, and welders, while the 9,500-watt running output sustains multiple heavy tools or household circuits simultaneously. Gasoline delivers 19 hours of runtime at quarter load, making this unit suitable for extended outages or multi-day events without constant refueling. The dual-fuel design means users can switch between gasoline and propane depending on fuel availability and storage constraints. On propane at 25% load, runtime drops to 7 hours, trading endurance for cleaner emissions and longer shelf life. The 457 cc cast iron engine is built for durability on job sites where generators take abuse. This is a stationary workhorse, not a portable grab-and-go unit.
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
    DuroMax XP12000HX
    9500W running
  • Quietest
    DuroMax XP12000HX
    74 dB
  • Longest Runtime
    Cat RP5500
    15h at 50% load
Where to buy
Prices can change. We update these automatically.
DuroMax XP12000HX
Store links
No links yet.
Cat RP5500
Store links
No links yet.
Disclosure: Some links may be affiliate links. Specs and comparisons are never hidden.