Cummins Onan C300D6 Specs (Power | Fuel Consumption)

The Cummins Onan C300D6 generator is listed with standby output of 300 kW, diesel fuel, 60 Hz operation, 4 available voltage configurations, Three phase, and sound level of 72 dBA @ 23 ft (7 m).

Cummins Onan Generator Specifications

Generator • diesel • 60 Hz • Three phase

Standby power: 300 kWVoltage options: 4 configurationsDry weight: 10,538 lb (4,780 kg)

Key specifications

300 kW Standby power

diesel Fuel

4 configurations Voltage options

Three phase Phase

10,538 lb (4,780 kg) Dry weight

72 dBA @ 23 ft (7 m) Sound level

60 Hz Frequency

Useful generator charts

Charts are shown only when this model has enough usable source data.

Fuel consumption by load

How fuel use changes as generator load increases.

25% load

7.2 gal/hr

50% load

11.8 gal/hr

75% load

17 gal/hr

100% load

23 gal/hr

Estimated runtime by load

Calculated from the listed 400 gal fuel capacity and fuel-consumption data.

25% load

55.5 hr

50% load

33.9 hr

75% load

23.5 hr

100% load

17.4 hr

Power-to-weight

Standby output per 1,000 lb of dry weight versus similar-output Cummins Onan models.

This model

28.5 kW

Peer average

45.1 kW

18th percentile

Power output

Low 270 kW High 300 kW

Standby

300 kW

Prime

270 kW

How the Cummins Onan C300D6 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

300 kW

29% above avg

77th percentile

Dry weight

10,538 lb

78% above avg

94th percentile

Sound level

72 dBA

10% below avg

15th percentile

Oil capacity

9.7 gal

27% above avg

74th percentile

Standby power300 kW

Low 150 kWAverage 232.8 kWHigh 354.6 kW

About 29% above the similar-output Cummins Onan average. Around the 77th percentile for this field.

Dry weight10,538 lb

Low 2,199 lbAverage 5,923 lbHigh 12,467 lb

About 78% above the similar-output Cummins Onan average. Around the 94th percentile for this field.

Sound level72 dBA

Low 69.7 dBAAverage 79.8 dBAHigh 97 dBA

About 10% below the similar-output Cummins Onan average. Around the 15th percentile for this field.

Oil capacity9.7 gal

Low 1.81 galAverage 7.66 galHigh 13.73 gal

About 27% above the similar-output Cummins Onan average. Around the 74th percentile for this field.

This model Peer average

Generator information

Manufacturer	Cummins Onan
Model	C300D6
Generator type	Generator
Fuel	diesel
Frequency	60 Hz

Electrical output

Standby power	300 kW
Prime power	270 kW
Standby kVA	375.0
Voltage options	208/120 V, 240/120 V, 480/277 V, 600/347 V
Phase	Three phase
Power factor	0.8
Circuit breaker	1200 A

Engine, cooling and controls

Engine model	Cummins/Onan QSM11-G4
Engine displacement	659 cu in (10.8 L)
Aspiration / cooling	turbocharged and after-cooled
Rated engine speed	1800 rpm
Engine oil capacity	9.7 gal (36.7 L)
Engine coolant capacity	2.51 gal (9.5 L)
Oil capacity	9.7 gal (36.7 L)
Maximum ambient	122 °F (50 °C)
Controller	PowerCommand
Alternator	Stamford/AvK HCI434E
Emissions	Tier III

Physical specifications

Dry weight	10, 538 lb (4, 780 kg)
Dimensions (L × W × H)	165 × 62 × 96 in (4191 × 1575 × 2439 mm)
Sound level	72 dBA @ 23 ft (7 m)

Battery

Battery group	GR31
Battery cranking	1000 CCA
Battery voltage	24V V

Fuel system and runtime

Fuel tank	400 gal (1, 514 L)
Tank runtime	26 hr

Fuel consumption

Standby	7.2 gal/h (27.3 L/h) @ 25%; 11.8 gal/h (44.7 L/h) @ 50%; 17.0 gal/h (64.4 L/h) @ 75%; 23.0 gal/h (87.1 L/h) @ 100%
Prime	6.5 gal/h (24.6 L/h) @ 25%; 10.8 gal/h (40.9 L/h) @ 50%; 15.0 gal/h (46.8 L/h) @ 75%; 19.8 gal/h (75.0 L/h) @ 100%

Maintenance and service parts

Engine oil	Interval: 12000 hr
Oil filter	Interval: 2000 hr
Fuel filter	Interval: 500 hr
Air filter	Interval: 1000 hr
Coolant	Interval: 50 hr

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