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Cummins/Onan GFGA Generator Set

The Cummins/Onan GFGA is a 250 kW (562 kVA) Natural Gas standby generator set powered by a Cummins/Onan GTA28 engine. It is available at 110/190 V, 220/380 V, 120/240 V and 277/480 V, 3-phase, 60 Hz and rated 1734 A. It holds about 5.5 L (1.5 gal) of oil and 170 L (44.9 gal) of coolant, with a maximum ambient rating of 38 °C. Starting uses group-8 battery rated 850 CCA at 24 V. The set measures 4267×2413×2489 mm (168.0×95.0×98.0 in) and weighs about 5669 kg (12498 lb).

250 kW
Standby
28.0 L
Displacement
5.5 L
Oil capacity
1
Document types

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Specifications

FuelNatural Gas
Frequency60.0 Hz
Standby power250 kW
Standby kVA562
Prime power450 kW
EmissionsEPA SI NSPS Compliant Capable
ControllerDetector 12 Controls, PowerCommand 1.1, PowerCommand digital electronic
Oil capacity5.5 L
AlternatorCummins/Onan Revolving field, single bearing, 4-pole, brushless, drip-proof construction
Voltage options110/190 V, 220/380 V, 120/240 V, 277/480 V
Phase3-phase
Rated current[1734, 1640, 1503, 949, 867, 820, 752, 601] A
Power factor0.8
Battery group8D
Battery cranking850 CCA
Battery voltage24 V
Coolant capacity170 L
Max ambient38 °C
Dimensions (L×W×H)4267×2413×2489 mm
Dry weight5669 kg

Engine

Cummins/Onan GTA28
Oil capacity68.0 L
Coolant capacity163.0 L
Displacement28.0 L
AspirationTurbocharged & Aftercooled
Rated speed1800 rpm

Maintenance & consumables

for the Cummins/Onan GTA28
ItemSpecCapacityPart #Interval
Air filterIMPCO High Altitude, Low Pressure Gas System (Std)— find
Fuel filter— find
Oil filterFull Flow Filter Capacity – Replaceable Element Type - U.S. gal.— find
Belt— find
Coolant170.0—
Coolant filter— find
OilMulti-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.102.0 gal—

Common questions

What is the power rating of the Cummins/Onan GFGA?

The Cummins/Onan GFGA is rated 250 kW standby (562.0 kVA).

What engine does the Cummins/Onan GFGA use?

The Cummins/Onan GFGA is powered by the Cummins/Onan GTA28 engine.

What fuel does the Cummins/Onan GFGA use?

The Cummins/Onan GFGA runs on Natural Gas.

What is the oil capacity of the Cummins/Onan GFGA?

The Cummins/Onan GTA28 engine in the Cummins/Onan GFGA has an oil capacity of 68.0 liters.

What alternator does the Cummins/Onan GFGA use?

The Cummins/Onan GFGA uses a Cummins/Onan Revolving field, single bearing, 4-pole, brushless, drip-proof construction alternator.

Fuel consumption

RatingLoadL/hgal/h
Prime
Standby
Standby0%37.0
Standby0%50.0
Standby1%63.0

Available documents

Spec sheet — Cummins-485-GFGA GTA28 (Cummins/Onan)Spec sheet — GFGA (480-500) (Cummins/Onan)Spec sheet — GTA28GGFGA (Cummins/Onan)