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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
  • Westinghouse iGen8200TFc
  • Model Onan P4500i
    Model Onan P4500i

    Cummins 3,700W Gas Generator

    3700W
    Running
    52 dB
    Noise
    View details
  • Model iGen8200TFc
    Model iGen8200TFc

    Westinghouse 6,600W Tri-Fuel Generator

    6600W
    Running
    60 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 P4500iWestinghouse iGen8200TFc
General
Product type
Generator
Generator
Fuel
Gasoline
Tri-Fuel
InverterYesYes
Parallel capableYesYes
RV readyYesYes
Running watts
3700 W
Winner: Winner: 6600 W
Starting watts
4500 W
Winner: Winner: 8200 W
Noise (lower limit)
Winner: Winner: 52 dB
60 dB
Weight
Winner: Winner: 98 lbs
134.5 lbs
Run time @50% load
Winner: Winner: 15 h
8.5 h
Run time @25% load
18 h
17 h
Fuel tank
3.4 gal
3.96 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
24.5 x 18.3 x 20.5
27 x 20.9 x 21.7
Electrical
Voltage (AC)
120
120/240V 60 Hz
Voltage (DC)
5
5
GFCI outletsNoYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
3 %
3 %
Engine
Engine
224 cc Ducar OHV 4-stroke
298 cc OHV 4-stroke, cast iron sleeve.
Alternator
Not available
Not available
Starting system
Recoil; Electric; Remote
Recoil, Electric, Remote
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
3700 W
6600 W
Starting watts
4500 W
8200 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
Not available
Run time @25% load
18 h
17 h
Natural gasNot availableNot available
Running watts
Not available
5280 W
Starting watts
Not available
6560 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
5940 W
Starting watts
Not available
7380 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
9.8 h
Other
Data center
Not available
Not available
Indicators
true
true
Compliance
CARB, EPA
EPA, ANSI/PGMA G300-2023
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Floating
true
UPC
690781007925
850060639784
Core / High-priority specs
Running Watts (Gasoline)
3700
6600
Running Watts (Propane)
Not available
5940
Running Watts (Natural Gas)
Not available
5280
Starting Watts (Gasoline)
4500
8200
Starting Watts (Propane)
Not available
7380
Starting Watts (Natural Gas)
Not available
6560
Runtime @ 50% Load (Gasoline)
15
Not available
Runtime @ 25% Load (Gasoline)
18
17
Runtime @ 25% Load (Propane)
Not available
9.8
AC Outlet Types
1x Duplex 120V 20A (5-20R); 1x 120V 30A (TT-30R)
1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (TT-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
298
Cylinder Sleeve
Not available
Cast iron
Alternator Winding Material
Not available
Copper windings
Engine Oil Type
10W30
SAE 10W-30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
18
17
Runtime @ 50% Load (Gasoline)
15
Not available
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringNoYes
Included equipment
Included Accessories
Oil, funnel, tool kit, key fob, battery charger, and battery
Oil, funnel, tool kit, key fob, battery charger, propane hose, and battery
Warranty & identification
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 Westinghouse iGen8200TFc is a 6,600-watt tri-fuel inverter generator built for homeowners and RV users who need flexible fuel sourcing and clean power for sensitive electronics. Its 8,200-watt starting capacity handles motor loads and air conditioning startup surges, while 3 percent THD protects laptops, TVs, and medical equipment from voltage spikes.
  • Most Powerful
    Westinghouse iGen8200TFc
    6600W 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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Westinghouse iGen8200TFc
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