The Cummins Onan C125 N6 generator is listed with standby output of 125 kW, Natural Gas fuel, and 60 Hz operation.
Cummins Onan Generator Specifications
Generator • Natural Gas • 60 Hz
Standby power: 125 kWDry weight: 3,483 lb (1,580 kg)
Key specifications
125 kW Standby power
Natural Gas Fuel
3,483 lb (1,580 kg) Dry weight
60 Hz Frequency
Useful generator charts
Charts are shown only when this model has enough usable source data.
Power-to-weight
Standby output per 1,000 lb of dry weight versus similar-output Cummins Onan models.
This model
35.9 kW
Peer average
31.8 kW
64th percentile
Power output
Low 125 kW High 125 kW
Standby
125 kW
Prime
125 kW
Model spec snapshot
Representative numeric specifications from this generator.
125 kWStandby
3,483.3 lbWeight
How the Cummins Onan C125 N6 compares
This compares the supplied numeric specification with Cummins Onan generators in the same broad standby-power class where enough comparable data exists.
Standby power
125 kW
34% above avg
82nd percentile
Dry weight
3,483 lb
In line with avg
81st percentile
Standby power125 kW
Low 60 kWAverage 93 kWHigh 144.5 kW
About 34% above the similar-output Cummins Onan average. Around the 82nd percentile for this field.
Dry weight3,483 lb
Low 1,881 lbAverage 3,569 lbHigh 6,592 lb
Very close to the similar-output Cummins Onan average. Around the 81st percentile for this field.
This model Peer average
Generator information
| Manufacturer | Cummins Onan |
|---|---|
| Model | C125 N6 |
| Generator type | Generator |
| Fuel | Natural Gas |
| Frequency | 60 Hz |
Electrical output
| Standby power | 125 kW |
|---|---|
| Prime power | 125 kW |
| Standby kVA | 156.0 |
Engine, cooling and controls
| Engine model | Cummins/Onan QSJ8.9G |
|---|---|
| Engine displacement | 543 cu in (8.9 L) |
| Aspiration / cooling | in-line, spark-ignition (SI) |
| Rated engine speed | 1800 rpm |
| Coolant capacity | 125 kW – 50° C (122° F) ambient cooling system / 150 kW – 45° C (113° F) ambient cooling system L |
| Controller | PowerCommand 2.3 |
| Emissions | EPA |
Physical specifications
| Dry weight | 3, 483 lb (1, 580 kg) |
|---|---|
| Dimensions (L × W × H) | 112.9 × 40 × 55.7 in (2867 × 1016 × 1415 mm) |
Battery
| Battery cranking | 850 CCA |
|---|
Maintenance and service parts
| Engine oil | Interval: 250 hr; Specification: Replace engine oil and filters. Refer to the Engine Oil section for the procedure. |
|---|---|
| Fuel filter | Interval: 24 hr; Specification: Check fuel lines and hoses: Visually check for leaks, worn or damaged hoses. To replace, contact your authorized distributor. |
| Air filter | Interval: 250 hr |
| Coolant | Interval: 500 hr; Specification: Starts to open within 2 °F (1 °C) of 180 °F (82 °C); Fully open within 2 °F (1 °C) of 203 °F (95 °C); Flow valve and flange clearance (minimum): 0.26 in (6.6 mm) |
| Belt | Interval: 24 hr; Specification: Checking drive belt condition and tension: Visually check belt for evidence of wear or slippage. To replace, contact your authorized distributor. |
Disclaimer: Specifications should be verified against the official owner’s or service manual and confirmed on the Cummins North America generator website.