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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 P2500i
  • Generac #8947 iQ5200DF
  • Model Onan P2500i
    Model Onan P2500i

    Cummins 2,200W Gas Generator

    2200W
    Running
    52 dB
    Noise
    View details
  • Model #8947 iQ5200DF
    Model #8947 iQ5200DF

    Generac 3,900W Dual-Fuel Generator

    3900W
    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 P2500iGenerac #8947 iQ5200DF
General
Product type
Generator
Generator
Fuel
Gasoline
Dual-Fuel
InverterYesYes
Parallel capableYesYes
RV readyNoNo
Running watts
2200 W
Winner: Winner: 3900 W
Starting watts
2500 W
Winner: Winner: 5200 W
Noise (lower limit)
Winner: Winner: 52 dB
0 dB
Weight
Winner: Winner: 48 lbs
107 lbs
Run time @50% load
8 h
Winner: Winner: 9 h
Run time @25% load
10 h
15 h
Fuel tank
1 gal
3.2 gal
Fuel gaugeYesNo
Approx. dimensions (L × W × H)
19.8 x 10.5 x 18.3
24.6 x 20.3 x 22.5
Electrical
Voltage (AC)
120
120
Voltage (DC)
12
5
GFCI outletsNoYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
<3% %
<3% %
Engine
Engine
98 cc Ducar OHV 4-stroke engine
223 cc OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil
Recoil, Electric
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
2200 W
3900 W
Starting watts
2500 W
5200 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
9 h
Run time @25% load
10 h
15 h
PropaneNot availableNot available
Running watts
Not available
3500 W
Starting watts
Not available
4700 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
11 h
Run time @25% load
Not available
20 h
Other
Data center
Not available
Not available
Indicators
true
false
Compliance
CARB, EPA
CARB, EPA, ANSI/PGMA G300-2023
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Floating
true
UPC
690781007918
696471104509
Core / High-priority specs
Running Watts (Gasoline)
2200
3900
Running Watts (Propane)
Not available
3500
Starting Watts (Gasoline)
2500
5200
Starting Watts (Propane)
Not available
4700
Runtime @ 50% Load (Gasoline)
8
9
Runtime @ 50% Load (Propane)
Not available
11
Runtime @ 25% Load (Gasoline)
10
15
Runtime @ 25% Load (Propane)
Not available
20
AC Outlet Types
1x Duplex 120V 20A (5-20R)
2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
Ducar OHV 4-stroke
OHV 4-stroke
Engine Displacement
98
223
Engine Oil Type
SAE 10W30
10W-30 / SAE 30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
10
15
Runtime @ 50% Load (Gasoline)
8
9
Runtime @ 50% Load (Propane)
Not available
11
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
Starting Components
Not available
Oil, funnel, tool kit, propane hose, and battery
Included Accessories
Oil, funnel, and tool kit
Oil, funnel, tool kit, propane hose, and battery
Warranty & identification
Part Number
Not available
8947, 8945
Additional specs
Summary
The Cummins Onan P2500i is a 2200-watt inverter generator built for users who need portable power without sacrificing runtime or noise control. At 48 pounds and measuring 19.8 by 10.5 by 18.3 inches, this unit bridges the gap between true portability and practical capacity. It can run a microwave, small refrigerator, or circular saw continuously, making it suitable for camping trips, job sites, tailgating, and emergency backup. The 1-gallon fuel tank delivers 10 hours at 25 percent load and 8 hours at 50 percent load, meaning most users refuel once per day rather than multiple times. The inverter topology produces clean power with less than 3 percent THD, which protects laptops, phone chargers, and sensitive electronics from voltage spikes. Cummins backs this unit with a 3-year warranty, longer than the 2.4-year average for comparable inverter generators. The 52 dBA noise level sits between a normal conversation and light traffic, allowing operation in noise-restricted campgrounds and residential neighborhoods without drawing complaints.
The Generac iQ5200DF is a 3,900-watt dual-fuel inverter generator that bridges emergency home backup and recreational use. At this output level, it powers essential circuits like refrigerators, sump pumps, and window air conditioners simultaneously, but not a full house or central HVAC. The dual-fuel design lets owners switch between gasoline and propane based on availability, a genuine advantage when supply chains break down during extended outages. Because the iQ5200DF produces electronically regulated current with less than 3% THD, laptops, flat-screen TVs, CPAP machines, and smart home devices run safely without voltage-related risk.
  • Most Powerful
    Generac #8947 iQ5200DF
    3900W running
  • Quietest
    Cummins Onan P2500i
    52 dB
  • Longest Runtime
    Generac #8947 iQ5200DF
    9h at 50% load
Where to buy
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Cummins Onan P2500i
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Generac #8947 iQ5200DF
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