Cummins Onan CS1250-6 Specs (Power | Fuel Consumption)

The Cummins Onan CS1250-6 generator is listed with standby output of 1020 kW, Diesel fuel, 60 Hz operation, 220 V, 480 V output, and Single phase.

Cummins Onan Generator Specifications

Generator • Diesel • 60 Hz • Single phase

Standby power: 1020 kWVoltage options: 220 V, 480 VDry weight: 4,872 lb (2,210 kg)

Key specifications

1020 kW Standby power

Diesel Fuel

220 V, 480 V Voltage options

Single phase Phase

4,872 lb (2,210 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

209.4 kW

Peer average

55.6 kW

99th percentile

Model spec snapshot

Representative numeric specifications from this generator.

1,020 kWStandby

4,872.22 lbWeight

How the Cummins Onan CS1250-6 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

1,020 kW

44% below avg

9th percentile

Dry weight

4,872 lb

84% below avg

14th percentile

Oil capacity

35.66 gal

31% below avg

36th percentile

Standby power1,020 kW

Low 1,000 kWAverage 1,831.9 kWHigh 3,562 kW

About 44% below the similar-output Cummins Onan average. Around the 9th percentile for this field.

Dry weight4,872 lb

Low 71 lbAverage 30,152 lbHigh 65,094 lb

About 84% below the similar-output Cummins Onan average. Around the 14th percentile for this field.

Oil capacity35.66 gal

Low 0.28 galAverage 51.88 galHigh 105.14 gal

About 31% below the similar-output Cummins Onan average. Around the 36th percentile for this field.

This model Peer average

Generator information

Manufacturer	Cummins Onan
Model	CS1250-6
Generator type	Generator
Fuel	Diesel
Frequency	60 Hz

Electrical output

Standby power	1020 kW
Standby kVA	1276.0
Voltage options	220 V, 480 V
Phase	Single phase

Engine, cooling and controls

Engine model	Cummins/Onan KTA38-G4
Engine displacement	2, 301 cu in (37.7 L)
Aspiration / cooling	Turbocharged and Aftercooled
Rated engine speed	1800 rpm
Engine oil capacity	34 gal (128.7 L)
Oil capacity	35.7 gal (135 L)
Coolant capacity	81.1 gal (307 L)
Maximum ambient	104 °F (40 °C)
Controller	PCL

Physical specifications

Dry weight	4, 872 lb (2, 210 kg)

Disclaimer: Specifications should be verified against the official owner’s or service manual and confirmed on the Cummins North America generator website.