Cummins Onan GFGA Specs (Power | Fuel Consumption)

The Cummins Onan GFGA generator is listed with standby output of 250 kW, Natural Gas fuel, 60 Hz operation, 4 available voltage configurations, Three phase, and rated current of 1734 / 1640 / 1503 / 949 / 867 / 820 / 752 / 601 A.

Cummins Onan Generator Specifications

Generator • Natural Gas • 60 Hz • Three phase

Standby power: 250 kWVoltage options: 4 configurationsRated current: 1734 / 1640 / 1503 / 949 / 867 / 820…Dry weight: 12,498 lb (5,669 kg)

Key specifications

250 kW Standby power

Natural Gas Fuel

4 configurations Voltage options

Three phase Phase

1734 / 1640 / 1503 / 949 / 867 / 820… Rated current

12,498 lb (5,669 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

20 kW

Peer average

45.1 kW

1st percentile

Power output

Low 250 kW High 450 kW

Standby

250 kW

Prime

450 kW

Model spec snapshot

Representative numeric specifications from this generator.

250 kWStandby

12,498.01 lbWeight

How the Cummins Onan GFGA 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

250 kW

7% above avg

62nd percentile

Dry weight

12,498 lb

111% above avg

98th percentile

Oil capacity

1.45 gal

81% below avg

2nd percentile

Standby power250 kW

Low 150 kWAverage 232.8 kWHigh 354.6 kW

About 7% above the similar-output Cummins Onan average. Around the 62nd percentile for this field.

Dry weight12,498 lb

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

About 111% above the similar-output Cummins Onan average. Around the 98th percentile for this field.

Oil capacity1.45 gal

Low 1.81 galAverage 7.66 galHigh 13.73 gal

About 81% below the similar-output Cummins Onan average. Around the 2nd percentile for this field.

This model Peer average

Generator information

Manufacturer	Cummins Onan
Model	GFGA
Generator type	Generator
Fuel	Natural Gas
Frequency	60 Hz

Electrical output

Standby power	250 kW
Prime power	450 kW
Standby kVA	562.0
Voltage options	110/190 V, 220/380 V, 120/240 V, 277/480 V
Phase	Three phase
Rated current	1734 / 1640 / 1503 / 949 / 867 / 820 / 752 / 601 A
Power factor	0.8

Engine, cooling and controls

Engine model	Cummins/Onan GTA28
Engine displacement	1, 709 cu in (28 L)
Aspiration / cooling	Turbocharged & Aftercooled
Rated engine speed	1800 rpm
Engine oil capacity	18 gal (68 L)
Engine coolant capacity	43.1 gal (163 L)
Oil capacity	1.45 gal (5.5 L)
Coolant capacity	44.9 gal (170 L)
Maximum ambient	100 °F (38 °C)
Controller	Detector 12 Controls, PowerCommand 1.1, PowerCommand digital electronic
Alternator	Cummins/Onan Revolving field, single bearing, 4-pole, brushless, drip-proof construction
Emissions	EPA SI NSPS Compliant Capable

Physical specifications

Dry weight	12, 498 lb (5, 669 kg)
Dimensions (L × W × H)	168 × 95 × 98 in (4267 × 2413 × 2489 mm)

Battery

Battery group	8D
Battery cranking	850 CCA
Battery voltage	24 V

Fuel consumption

Standby	37.0 gal/h @ 0%; 50.0 gal/h @ 1%; 63.0 gal/h

Maintenance and service parts

Engine oil	Specification: Multi-viscosity or straight weight single viscosity NATURAL GAS ENGINE OIL that meets Mil-2104A(CB), Mil-2104B (CC), Mil-2104C (CD/SC), CE and CF-4 specification. Ash Content between .15 and .85 of one percent.; Capacity: 102.0 gal
Oil filter	Specification: Full Flow Filter Capacity – Replaceable Element Type – U.S. gal.
Air filter	Specification: IMPCO High Altitude, Low Pressure Gas System (Std)
Coolant	Capacity: 170

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