Cummins Onan GFJB Specs (Power | Fuel Consumption)

The Cummins Onan GFJB generator is listed with standby output of 500 kW, natural gas fuel, 60 Hz operation, 8 available voltage configurations, and Three phase.

Cummins Onan Generator Specifications

Generator • natural gas • 60 Hz • Three phase

Standby power: 500 kWVoltage options: 8 configurationsDry weight: 18,746 lb (8,503 kg)

Key specifications

500 kW Standby power

natural gas Fuel

8 configurations Voltage options

Three phase Phase

18,746 lb (8,503 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

26.7 kW

Peer average

58 kW

11th percentile

Power output

Low 500 kW High 515 kW

Standby

500 kW

Prime

515 kW

Model spec snapshot

Representative numeric specifications from this generator.

500 kWStandby

18,745.91 lbWeight

How the Cummins Onan GFJB 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

500 kW

25% below avg

15th percentile

Dry weight

18,746 lb

21% above avg

80th percentile

Oil capacity

34.08 gal

26% above avg

64th percentile

Standby power500 kW

Low 400 kWAverage 665.2 kWHigh 921.6 kW

About 25% below the similar-output Cummins Onan average. Around the 15th percentile for this field.

Dry weight18,746 lb

Low 4,643 lbAverage 15,485 lbHigh 39,573 lb

About 21% above the similar-output Cummins Onan average. Around the 80th percentile for this field.

Oil capacity34.08 gal

Low 8.83 galAverage 27 galHigh 54.53 gal

About 26% above the similar-output Cummins Onan average. Around the 64th percentile for this field.

This model Peer average

Generator information

Manufacturer	Cummins Onan
Model	GFJB
Generator type	Generator
Fuel	natural gas
Frequency	60 Hz

Electrical output

Standby power	500 kW
Prime power	515 kW
Standby kVA	562.0
Voltage options	120/208 V, 127/220 V, 139/240 V, 220/380 V, 240/416 V, 254/440 V, 277/480 V, 347/600 V
Phase	Three phase
Power factor	0.8

Engine, cooling and controls

Engine model	Cummins/Onan GTA38
Engine displacement	2, 301 cu in (37.7 L)
Aspiration / cooling	Spark Ignited
Rated engine speed	1800 rpm
Engine oil capacity	34.1 gal (129 L)
Engine coolant capacity	71.9 gal (272 L)
Oil capacity	34.1 gal (129 L)
Coolant capacity	40.9 gal (155 L)
Maximum ambient	104 °F (40 °C)
Controller	PowerCommand, PowerCommand 1.1
Emissions	EPA SI NSPS Compliant Capable

Physical specifications

Dry weight	18, 746 lb (8, 503 kg)
Dimensions (L × W × H)	188 × 108 × 90 in (4775 × 2743 × 2286 mm)

Battery

Battery group	8D
Battery cranking	1800 CCA
Battery voltage	24 V

Fuel consumption

Standby	0%; 1%
Prime	8268 L/h @ 1%

Maintenance and service parts

Engine oil	Capacity: 4.0 gal

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