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ReaLoadREVIEWS
ReaLoad Engineering Benchmark

Cummins Onan P2500i vs. Honda EU2200i Companion

Fuel Benchmark:
Elevation:

ReaLoad Technical Verdict & Engineering Dossier

Motor Surge & HVAC Starting

Cummins Onan P2500i delivers 2,500W surge, sufficient for a 3.5-Ton central A/C with soft-starter. Inverters under 7,500W surge will trip breaker overcurrent protection on direct compressor starts.

72-Hour Fuel Logistics

At 50% load over 72 hours, continuous gasoline generators consume ~56 gallons (11x 5-gallon cans). Direct utility Natural Gas hookup eliminates fuel storage degradation, winter freezing, and gas station queues.

NEC 250.20 Neutral Bonding

Cummins has factory floating neutral, safely compliant with 3-pole transfer switches and manual panel interlocks without ground loop faults.

Natural Gas Leader
Cummins Onan P2500i
0 W running on NG (+0 W lead)
Acoustic Winner
Honda EU2200i Companion
48 dBA at 23ft (-4 dBA quieter)
Easiest Home Hookup
Cummins Onan P2500i
Floating Neutral (Home Interlock Ready)
Best $/Running Watt
Cummins Onan P2500i
$0.32/W ($699)
Technical Specification
Enclosed Inverter
Cummins Onan P2500i
$699Read Review
Enclosed Inverter
Honda EU2200i Companion
$1,299Read Review
Running Watts
Power Output
2,200 WBest
1,800 W
Peak Starting Surge
Power Output
2,500 WBest
2,200 W
240V Output Amps
Power Output
9.2 ABest
7.5 A
Sine Wave Purity
Power Quality
<1.7% THD (Pure Sine)
<1.5% THD (Pure Sine)Best
Fuel Burn (25%)
Fuel Consumption
0.16 GPH
0.10 GPHBest
Fuel Burn (50%)
Fuel Consumption
0.28 GPH
0.22 GPHBest
Runtime (25% Load)
Fuel Consumption
10 HoursBest
8.1 Hours
Fuel Tank Capacity
Fuel Consumption
1 GallonsBest
0.95 Gallons
14-50R 50A Outlet
Outlets & Receptacles
None (Use Adapter)Best
None (Use Adapter)Best
L14-30R 30A Outlet
Outlets & Receptacles
NoneBest
NoneBest
TT-30R RV Outlet
Outlets & Receptacles
NoneBest
NoneBest
5-20R Duplex Outlets
Outlets & Receptacles
1x NEMA 5-20R DuplexBest
1x NEMA 5-20R DuplexBest
Engine Start Method
Starting & Safety
Electric Push-Button & Recoil Pull
Electric Push-Button & Recoil Pull
Carbon Monoxide Sensor
Starting & Safety
CO Watchdog / Shield Sensor (ANSI/PGMA G300)
CO Watchdog / Shield Sensor (ANSI/PGMA G300)
Noise Level (23ft)
Acoustics & Physical
52 dBA
48 dBABest
Chassis Dimensions
Acoustics & Physical
19.7" L × 11.8" W × 18.1" H
20" L × 11.4" W × 16.7" H
Dry Weight
Acoustics & Physical
48 lbs
46.5 lbsBest
Neutral Bonding
NEC 2026 Hookup
Floating Neutral (Ready for Home Interlock)
Floating Neutral (Ready for Home Interlock)
Verified Street Price
Cost & Value
$699.00Best
$1,299.00