What engine does the Generac SG1000 use?

The SG1000 uses a Generac-built 49.0-liter V12 spark-ignited engine with turbocharged and aftercooled aspiration running at 1800 RPM. The engine has a bore of 6.69 inches (170 mm), stroke of 7.09 inches (180 mm), and 10.0:1 compression ratio. It produces 1,467 horsepower at standby rating with BMEP of 216 psi. It uses MotorTech electronic ignition, cast aluminum alloy pistons, and a chromium molybdenum steel (SCM440H) crankshaft with a variable venturi carburetor.

What is the fuel consumption of the Generac SG1000?

On natural gas at standby/demand response rating (at standard conditions of 68 degrees F and 14.7 psi), the SG1000 consumes 11,243 scfh at 100% load, 8,655 scfh at 75%, 6,021 scfh at 50%, and 3,418 scfh at 25% load. Operating fuel pressure required is 14-28 inches of water column (3.5-7.0 kPa). Gas supply infrastructure must be sized to accommodate the full 11,243 scfh consumption.

What voltages are available for the SG1000?

The SG1000 is available in two three-phase configurations: 277/480 VAC (1,505 amps) and 346/600 VAC (1,204 amps), both at 0.8 power factor. The standard alternator K1248064N22 provides 3,300 skVA motor starting capability at 277/480V with 30% voltage dip. Optional larger alternators K1344064N22 (4,000 skVA) and K1500064N22 (4,500 skVA) are available for higher motor starting requirements.

What are the dimensions and weight of the SG1000?

The open-set SG1000 measures 220.3 x 102.0 x 108.1 inches (over 18 feet long) and weighs approximately 22,798-24,495 lbs. Sound-attenuated enclosures (Levels 0, 1, and 2) all measure 329.3 x 105.8 x 136.9 inches -- nearly 27.5 feet long. Level 2 steel enclosure weight is 29,697-31,394 lbs. Both steel and aluminum enclosure options are available.

What oil capacity does the SG1000 require?

The SG1000 crankcase holds 285 quarts (270 liters) of oil with filter -- significantly more than the 33.9L platform used in the SG625 and SG750. This large oil volume requires careful planning for oil changes, including adequate drain containers and used oil disposal. The engine uses gear-driven oil pump with full-flow spin-on cartridge filtration.

Generac · SG Series (Industrial Gaseous)

Generac SG1000

Name: Generac SG1000
Brand: Generac
Availability: PreOrder

1000 kW standby · Natural Gas · Liquid-cooled

1000 kW natural gas industrial standby generator. Generac 49.0L V12 spark-ignited, turbocharged/aftercooled, EPA Certified Stationary Emergency and Non-Emergency.

Standby power: 1000 kW
Voltage options: 277/480V, 346/600V
Frequency / Phase: 60 Hz · 3-phase
Engine: Generac 49.0L SI · 49L
EPA / Emissions: EPA Stationary Spark Ignition
Alternator: Generac K1248064N22

Commercial Manufacturing Healthcare Data Centersdemand-response

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Overview#

The Generac SG1000 is the flagship of Generac's SG Series industrial gaseous generator lineup, delivering 1,000 kilowatts of standby power from a Generac-built 49.0-liter V12 spark-ignited engine with turbocharged and aftercooled aspiration. EPA Certified for both Stationary Emergency and Non-Emergency operation, the SG1000 is Demand Response Ready and targets hospitals, data centers, large campuses, and heavy industrial facilities.

At the megawatt class, the SG1000 uses the K1248064N22 alternator with Class H insulation, permanent magnet excitation, and flexible plate coupling. The Power Zone Pro Sync controller provides NFPA 110 Level 1 compliance, arc flash maintenance mode, Modbus RTU/TCP-IP communication, Ethernet-based generator-to-generator paralleling communications, and a 7-inch sunlight-readable color touchscreen display with built-in diagnostics.

The Generac 49.0L V12 platform#

The 49.0-liter engine is Generac's largest spark-ignited platform, stepping up from the 33.9L used in the SG625/SG750. With a 6.69-inch bore and 7.09-inch stroke, this engine produces 1,467 horsepower at BMEP of 216 psi and piston speed of 2,126 ft/min. The MotorTech electronic ignition system, variable venturi carburetor, and chromium molybdenum steel (SCM440H) crankshaft distinguish this engine from the smaller SG Series platforms. The 285-quart (270-liter) oil capacity is substantial, and the 76-inch (1,930 mm) diameter pusher fan provides airflow of 57,846 cfm across the radiator. The 80-gallon coolant system capacity supports operation up to 122 degrees F ambient.

Our service experience#

The SG1000 is a significant installation. At over 18 feet long in open set configuration and nearly 27.5 feet in an enclosure, site planning must account for clearances, rigging, and foundation requirements for the 22,800+ pound unit. Gas supply engineering is critical -- at 11,243 scfh full-load consumption with 14-28 in WC supply pressure requirement, a dedicated commercial gas meter and regulator station is mandatory. The 270-liter oil changes require logistical planning. We recommend maintaining a dedicated service contract with an industrial generator dealer for units at this scale. The MotorTech ignition system and variable venturi carburetor require specialized expertise -- ensure your service provider has specific experience with the 49.0L platform, not just the smaller SG Series engines.

Engineering specifications

Physical

Length: 220.3 in
Width: 102 in
Height: 108.1 in
Dry weight: 22,798 lb

Fuel system & runtime

NG required pressure: 14 in WC

Thermal & ventilation

Exhaust flow: 8,500 CFM
Exhaust temp: 1458 °F
Combustion air: 2,205 CFM

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

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Estimate runtime for the Generac SG1000

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

Estimate runtime on this tank

Generator size

Fuel

Load

Fuel demand at 75% load

10,500,000 BTU/hr≈ 10500.0 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 SG1000 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter: Every 250 hours or 12 months
Coolant change: Every 4000 hours
Air filter: Every 1000 hours
Spark plugs: Every 1500 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.

Component	Symptom	Typical hours	Severity
Spark plugs / ignition system (MotorTech)	Misfire under load, rough running, elevated exhaust temps	1,500+	minor
Turbocharger / aftercooler	Loss of power, elevated intake air temperatures, oil consumption	12,000+	moderate
Coolant system	High coolant temperature alarm, coolant leak at hoses	10,000+	moderate
Battery (4x 12V required)	Failed to start, slow cranking	8,760+	minor
Fuel regulator / variable venturi carburetor	Unstable power output, frequency hunting under varying loads	15,000+	moderate

Frequently Asked Questions

What engine does the Generac SG1000 use?: The SG1000 uses a Generac-built 49.0-liter V12 spark-ignited engine with turbocharged and aftercooled aspiration running at 1800 RPM. The engine has a bore of 6.69 inches (170 mm), stroke of 7.09 inches (180 mm), and 10.0:1 compression ratio. It produces 1,467 horsepower at standby rating with BMEP of 216 psi. It uses MotorTech electronic ignition, cast aluminum alloy pistons, and a chromium molybdenum steel (SCM440H) crankshaft with a variable venturi carburetor.
What is the fuel consumption of the Generac SG1000?: On natural gas at standby/demand response rating (at standard conditions of 68 degrees F and 14.7 psi), the SG1000 consumes 11,243 scfh at 100% load, 8,655 scfh at 75%, 6,021 scfh at 50%, and 3,418 scfh at 25% load. Operating fuel pressure required is 14-28 inches of water column (3.5-7.0 kPa). Gas supply infrastructure must be sized to accommodate the full 11,243 scfh consumption.
What voltages are available for the SG1000?: The SG1000 is available in two three-phase configurations: 277/480 VAC (1,505 amps) and 346/600 VAC (1,204 amps), both at 0.8 power factor. The standard alternator K1248064N22 provides 3,300 skVA motor starting capability at 277/480V with 30% voltage dip. Optional larger alternators K1344064N22 (4,000 skVA) and K1500064N22 (4,500 skVA) are available for higher motor starting requirements.
What are the dimensions and weight of the SG1000?: The open-set SG1000 measures 220.3 x 102.0 x 108.1 inches (over 18 feet long) and weighs approximately 22,798-24,495 lbs. Sound-attenuated enclosures (Levels 0, 1, and 2) all measure 329.3 x 105.8 x 136.9 inches -- nearly 27.5 feet long. Level 2 steel enclosure weight is 29,697-31,394 lbs. Both steel and aluminum enclosure options are available.
What oil capacity does the SG1000 require?: The SG1000 crankcase holds 285 quarts (270 liters) of oil with filter -- significantly more than the 33.9L platform used in the SG625 and SG750. This large oil volume requires careful planning for oil changes, including adequate drain containers and used oil disposal. The engine uses gear-driven oil pump with full-flow spin-on cartridge filtration.

Compatible equipment

Transfer switches

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