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

  • Cummins Onan P4500i
  • Generac #8063 GP9500ETF
  • Model Onan P4500i
    Model Onan P4500i

    Cummins 3,700W Gas Generator

    3700W
    Running
    52 dB
    Noise
    View details
  • Model #8063 GP9500ETF
    Model #8063 GP9500ETF

    Generac 9,500W Tri-Fuel Generator

    9500W
    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
SpecificationCummins Onan P4500iGenerac #8063 GP9500ETF
General
Product type
Generator
Generator
Fuel
Gasoline
Tri-Fuel
InverterYesNo
Parallel capableYesNo
RV readyYesYes
Running watts
3700 W
Winner: Winner: 9500 W
Starting watts
4500 W
Winner: Winner: 12500 W
Noise (lower limit)
Winner: Winner: 52 dB
0 dB
Weight
Winner: Winner: 98 lbs
219 lbs
Run time @50% load
Winner: Winner: 15 h
9.5 h
Run time @25% load
18 h
14 h
Fuel tank
3.4 gal
7.5 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
24.5 x 18.3 x 20.5
27.5 x 27.1 x 27.6
Electrical
Voltage (AC)
120
120/240
Voltage (DC)
5
Not available
GFCI outletsNoYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
3 %
Not available
Engine
Engine
224 cc Ducar OHV 4-stroke
OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil; Electric; Remote
Recoil, Electric
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
3700 W
9500 W
Starting watts
4500 W
12500 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
15 h
9.5 h
Run time @25% load
18 h
14 h
Natural gasNot availableNot available
Running watts
Not available
7000 W
Starting watts
Not available
9000 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
Not available
Not available
Run time @25% load
Not available
Not available
PropaneNot availableNot available
Running watts
Not available
8550 W
Starting watts
Not available
11250 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
Not available
4.5 h
Run time @25% load
Not available
6 h
Other
Data center
Not available
Not available
Indicators
true
false
Compliance
CARB, EPA
EPA, ANSI/PGMA G300-2023
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Floating
true
UPC
690781007925
696471104523
Core / High-priority specs
Running Watts (Gasoline)
3700
9500
Running Watts (Propane)
Not available
8550
Running Watts (Natural Gas)
Not available
7000
Starting Watts (Gasoline)
4500
12500
Starting Watts (Propane)
Not available
11250
Starting Watts (Natural Gas)
Not available
9000
Runtime @ 50% Load (Gasoline)
15
9.5
Runtime @ 50% Load (Propane)
Not available
4.5
Runtime @ 25% Load (Gasoline)
18
14
Runtime @ 25% Load (Propane)
Not available
6
AC Outlet Types
1x Duplex 120V 20A (5-20R); 1x 120V 30A (TT-30R)
1x Duplex 120V 20A (5-20R) GFCI; 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
Ducar OHV 4-stroke
OHV 4-stroke
Engine Displacement
224
400
Engine Oil Type
10W30
10W-30 / SAE 30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
18
14
Runtime @ 50% Load (Gasoline)
15
9.5
Runtime @ 50% Load (Propane)
Not available
4.5
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection, CO monitoring
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringNoYes
Included equipment
Mobility Components
Not available
Yes
Starting Components
Not available
Recoil, Electric
Fuel Connection Components
Not available
propane hose
Included Accessories
Oil, funnel, tool kit, key fob, battery charger, and battery
Oil, propane hose, battery, and wheel kit
Warranty & identification
Residential Warranty
Not available
3
Commercial Warranty
3
Not available
Part Number
A058U955
Not available
Additional specs
Summary
The Cummins Onan P4500i is a 3700-watt inverter generator built for users who need reliable power without the noise penalty. Its 4500-watt peak capacity handles startup surges for air conditioners, power tools, and RV air conditioning units. The gasoline engine runs clean enough for sensitive electronics like laptops and phones, thanks to a 3 percent THD rating that protects against voltage spikes. This unit bridges the gap between portable camping generators and stationary backup power, making it useful for RV owners, homeowners facing extended outages, and contractors working near occupied spaces.
The Generac GP9500ETF is a 9,500-watt tri-fuel generator built for whole-house backup and job site power. Its ability to run on gasoline, propane, or natural gas means users gain real fuel flexibility when one source becomes scarce during extended outages. The 12,500 starting watts provide enough surge capacity to handle motor-driven loads like well pumps and air handler fans without tripping breakers. This is a stationary workhorse, not a portable unit.
  • Most Powerful
    Generac #8063 GP9500ETF
    9500W running
  • Quietest
    Cummins Onan P4500i
    52 dB
  • Longest Runtime
    Cummins Onan P4500i
    15h at 50% load
Where to buy
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Cummins Onan P4500i
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Generac #8063 GP9500ETF
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