Generac · SG Series (Industrial Gaseous)

Generac SG230

230 kW standby / 207 kW prime · Natural Gas · Liquid-cooled

230 kW standby natural gas generator with Generac 14.2L inline-6 turbocharged/aftercooled spark-ignited engine. EPA certified stationary emergency and non-emergency. Demand response ready.

Generac Generac SG230 generator — specifications and details
Standby power
230 kW / 207 kW prime
Voltage options
120/208V, 120/240V, 277/480V, 346/600V
Frequency / Phase
60 Hz · 3-phase
Engine
Generac 14.2L Inline-6 SI · 14.2L
Alternator
Generac K0250124Y21
CommercialManufacturingdemand-responseHealthcareData Centers
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Overview#

The Generac SG230 is a 230 kW standby (207 kW prime) demand response ready industrial natural gas generator set powered by Generac's 14.2L inline-6 turbocharged and aftercooled spark-ignited engine. Rated at 288 kVA standby at 60 Hz, it is EPA certified for both stationary emergency and non-emergency applications. Available in three-phase configurations only, it features the Generac Power Zone Pro Sync controller with a 7-inch color touchscreen display, Modbus RTU/TCP/IP, and Ethernet communications.

Engine and alternator#

The Generac 14.2L inline-6 turbocharged/aftercooled engine delivers 230 kW standby at 1,800 RPM with a 9.5:1 compression ratio. Key construction features include a ductile iron crankshaft and cylinder liners, cast iron cylinder head, 7 main bearings, solid lifters, and high-temperature steel alloy exhaust valves with hardened valve seats. The 24V DC electrical system uses dual 12V batteries. Oil capacity is 36.2 quarts.

The standard alternator is the Generac K0250124Y21, a 4-pole revolving-field design with Class H insulation on both rotor and stator. It features permanent magnet excitation, full digital voltage regulation with plus or minus 0.25% steady-state accuracy, and total harmonic distortion below 5%.

Power ratings and fuel consumption#

At 277/480V three-phase and 0.8 power factor, the SG230 delivers 230 kW standby / 207 kW prime. No single-phase configuration is available on this model.

Natural gas consumption at standby/demand response ratings: 3,000 scfh at 100% load, 2,400 scfh at 75%, 1,560 scfh at 50%, and 990 scfh at 25% load.

Physical dimensions#

The open set measures 136.0 x 57.1 x 67.9 inches, weighing approximately 5,883 lbs. Weather protected, Level 1, Level 2, and Level 3 sound attenuated enclosure options are available.

Our service experience#

The SG230 shares the same 14.2L inline-6 platform and physical footprint as the SG250 — the two models differ only in output tuning (BMEP) and fuel consumption. Exhaust temperature at 1,340 degrees F is moderate for this displacement class. The transition to a three-phase-only configuration at this output level reflects the commercial and industrial installation profile of the model. The Power Zone Pro Sync controller enables paralleling for larger load requirements.

Engineering specifications

Physical

Length
136 in
Width
57.1 in
Height
67.9 in
Dry weight
5,883 lb

Thermal & ventilation

Exhaust temp
1340 °F

Documents & downloads

Spec sheets & manuals

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Estimate runtime for the Generac SG230

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Fuel demand at 75% load

2,415,000 BTU/hr≈ 2415.0 cf/min @ 1,000 BTU/cf

On utility natural gas the runtime is generally unlimited provided the supply line and meter can deliver this BTU/hr at the engine's required inlet pressure (typically 5–14" WC residential, up to 5 psi commercial). Confirm against the OEM's published fuel-pressure spec.

Service intervals

Manufacturer-recommended intervals for the Generac SG230 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter
Every 500 hours or 12 months
Coolant change
Every 4000 hours
Air filter
Every 500 hours
Spark plugs
Every 1000 hours
Major overhaul
≈ 15,000 hours
Load bank test
Every 12 months

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

ComponentSymptomTypical hoursSeverity
Spark plugs / ignitionMisfire, rough running, reduced power from plug fouling or gap wear on 6-cylinder platform1,000+moderate
TurbochargerPower loss from turbo bearing wear at high BMEP operation on the 14.2L platform10,000+moderate
Coolant systemOverheating from coolant degradation — exhaust temp reaches 1,340 F at rated output4,000+moderate
Exhaust valvesValve seat recession from high exhaust temperatures in turbocharged NG service12,000+severe
Fuel regulatorFrequency instability or fuel starvation from regulator diaphragm failure8,000+moderate

Frequently Asked Questions

What engine does the Generac SG230 use?
The SG230 uses a Generac-manufactured 14.2L inline-6 turbocharged and aftercooled spark-ignited engine. Compression ratio is 9.5:1, with a ductile iron crankshaft, 7 main bearings, solid lifters, and cast iron cylinder head. The engine operates at 1,800 RPM standby.
Is the SG230 demand response rated?
Yes. The SG230 is EPA certified for stationary emergency and non-emergency (demand response) applications. The standby and demand response rating is 230 kW / 288 kVA.
What voltages does the SG230 support?
The SG230 is three-phase only. It supports 120/208V, 120/240V, 277/480V, and 346/600V configurations at 0.8 pf standby.
What is the natural gas consumption at full load?
At 100% standby/demand response load, the SG230 consumes 3,000 scfh of natural gas. At 75% load: 2,400 scfh; at 50%: 1,560 scfh; at 25%: 990 scfh.
What are the dimensions of the SG230 open set?
The SG230 open set measures 136.0 x 57.1 x 67.9 inches, weighing approximately 5,883 lbs.

Compatible equipment

Engine

Transfer switches

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