The Cummins Onan C1250 N6 generator is listed with standby output of 1250 kW, Natural Gas fuel, 60 Hz operation, 8 available voltage configurations, and Three phase Line – Neutral / Line – Line.
Generator • Natural Gas • 60 Hz • Three phase Line – Neutral / Line – Line
Key specifications
Useful generator charts
Charts are shown only when this model has enough usable source data.
40.7 kW
55.6 kW
1,250 kW
1,250 kW
How the Cummins Onan C1250 N6 compares
This compares the supplied numeric specification with Cummins Onan generators in the same broad standby-power class where enough comparable data exists.
About 32% below the similar-output Cummins Onan average. Around the 20th percentile for this field.
Very close to the similar-output Cummins Onan average. Around the 51st percentile for this field.
About 93% above the similar-output Cummins Onan average. Around the 91st percentile for this field.
Generator information
| Manufacturer | Cummins Onan |
|---|---|
| Model | C1250 N6 |
| Generator type | Generator |
| Fuel | Natural Gas |
| Frequency | 60 Hz |
Electrical output
| Standby power | 1250 kW |
|---|---|
| Prime power | 1250 kW |
| Standby kVA | 1250.0 |
| Voltage options | 1247 V, 1380 V, 4160 V, 480 V, 600 V, 440 V, 380 V, 416 V |
| Phase | Three phase Line – Neutral / Line – Line |
| Power factor | 1 |
Engine, cooling and controls
| Engine model | Cummins/Onan QSK60G |
|---|---|
| Engine displacement | 3, 661 cu in (60 L) |
| Aspiration / cooling | Turbocharged (1) |
| Rated engine speed | 1500 rpm |
| Engine oil capacity | 100.4 gal (380 L) |
| Engine coolant capacity | 47.8 gal (181 L) |
| Oil capacity | 100.4 gal (380 L) |
| Maximum ambient | 140 °F (60 °C) |
| Controller | PowerCommand 3.3 |
| Emissions | EPA NSPS & Non-Road Mobile Factory Certified |
Physical specifications
| Dry weight | 30, 697 lb (13, 924 kg) |
|---|---|
| Dimensions (L × W × H) | 91.7 × 196.9 × 116.9 in (2330 × 5000 × 2970 mm) |
Battery
| Battery cranking | 450 CCA |
|---|---|
| Battery voltage | 24 V |
Fuel consumption
| Standby | 50%; 75%; 90%; 100% |
|---|
Maintenance and service parts
| Engine oil | Interval: 500 hr; Specification: Cummins InPower PC-based service tool; Capacity: 297 |
|---|---|
| Oil filter | Part number: F60-1500; Interval: 240 hr; Specification: Cummins OE filter |
| Fuel filter | Interval: 1680 hr; Specification: Cummins InPower PC-based service tool |
| Air filter | Interval: 1000 hr; Specification: Cummins InPower PC-based service tool |
| Coolant | Interval: 7304 hr; Specification: Cummins InPower PC-based service tool; Capacity: 4000 |
| Belt | Part number: B60-1500; Interval: 3360 hr; Specification: Cummins OE belt |
Disclaimer: Specifications should be verified against the official owner’s or service manual and confirmed on the Cummins North America generator website.