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  • DuroStar DS11000DX
  • Cat RP12000 E
  • Model DS11000DX
    Model DS11000DX

    DuroStar 9,000W Dual-Fuel Generator

    9000W
    Running
    74 dB
    Noise
    View details
  • Model RP12000 E
    Model RP12000 E

    Cat 12,000W Gas Generator

    12000W
    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
SpecificationDuroStar DS11000DXCat RP12000 E
General
Product type
Generator
Generator
Fuel
Dual-Fuel
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyYesYes
Running watts
9000 W
Winner: Winner: 12000 W
Starting watts
11000 W
Winner: Winner: 15000 W
Noise (lower limit)
Winner: Winner: 74 dB
0 dB
Weight
Winner: Winner: 230 lbs
350 lbs
Run time @50% load
9 h
Winner: Winner: 11.7 h
Run time @25% load
19 h
Not available
Fuel tank
8.3 gal
13.2 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
29 x 30 x 26 in
35.7 x 32.7 x 35.8
Electrical
Voltage (AC)
120/240V 60 Hz
120/240
Voltage (DC)
Not available
12
GFCI outletsYesYes
Covered outletsNoYes
Automatic Voltage RegulationYesYes
THD
Not available
5 %
Engine
Engine
457 cc OHV 4-stroke, cast iron sleeve
670 cc Rato OHV V-Twin
Alternator
Not available
Not available
Starting system
Recoil, Electric
Electric
Warranty
Warranty
5 years
2 years
Power by fuel
GasolineNot availableNot available
Running watts
9000 W
12000 W
Starting watts
11000 W
15000 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
11.7 h
Run time @25% load
19 h
Not available
PropaneNot availableNot available
Running watts
8550 W
Not available
Starting watts
10450 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
true
UPC
811640016722
815683023891
Core / High-priority specs
Running Watts (Gasoline)
9000
12000
Running Watts (Propane)
8550
Not available
Starting Watts (Gasoline)
11000
15000
Starting Watts (Propane)
10450
Not available
Runtime @ 50% Load (Gasoline)
9
11.7
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) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
2x Duplex 120V 20A (5-20R) GFCI; 2x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke, cast iron sleeve
670 cc Rato OHV V-Twin
Engine Displacement
457
670
Cylinder Sleeve
cast iron sleeve
Not available
Alternator Winding Material
Copper windings
Not available
Engine Oil Type
10W-30
Not available
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
19
Not available
Runtime @ 50% Load (Gasoline)
9
11.7
Runtime @ 50% Load (Propane)
3.5
Not available
Safety & compliance
Overload Protection System
Low oil and overload protection, CO monitoring
Low oil and overload protection
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesNo
Included equipment
Mobility Components
Wheel kit
Not available
Starting Components
Not available
Battery, Battery Charger, Wheel Kit
Included Accessories
Funnel, tool kit, propane hose, battery, and wheel kit
Oil, funnel, tool kit, battery charger, battery, and wheel kit
Warranty & identification
Part Number
Not available
502-3700
Additional specs
Summary
The DuroStar DS11000DX is a 9,000-watt dual fuel generator built around a 457cc OHV engine with cast iron sleeves. This wattage places it squarely in the home backup and light job site category. On gasoline, it runs 9 hours at half load and 19 hours at quarter load. On propane, runtime drops to 3.5 hours at half load and 7 hours at quarter load, making gasoline the practical choice for extended outages. The dual fuel option gives users flexibility when propane is more accessible or economical, though gasoline delivers longer operating windows per tank. At 74 dB, the noise level sits in the moderate range for this power class, meaning it will be audible but not prohibitively loud in residential settings. The 8.3-gallon fuel tank combined with the quarter-load runtime means users can stretch a single fill to nearly a full day of light operation.
The Cat RP12000 E is a 12,000-watt gasoline generator built for job sites, construction crews, and homeowners who need sustained power for multiple heavy tools or appliances simultaneously. The 15,000-watt peak output handles startup surges from air compressors, circular saws, and welders without stalling. At 350 pounds, this is a stationary or semi-portable unit. It ships with a wheel kit, battery charger, and full tool set, meaning users can operate it immediately without additional purchases.
  • Most Powerful
    Cat RP12000 E
    12000W running
  • Quietest
    DuroStar DS11000DX
    74 dB
  • Longest Runtime
    Cat RP12000 E
    11.7h at 50% load
Where to buy
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DuroStar DS11000DX
Store links
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Cat RP12000 E
Store links
No links yet.
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