What engine does the Generac SD2250/MD2250 use?

The SD2250/MD2250 uses a Baudouin 65.6-liter V12 turbocharged and aftercooled diesel engine running at 1800 RPM. The engine has a bore of 7.08 inches (180 mm), stroke of 8.46 inches (215 mm), and 16.5:1 compression ratio with a 4-valve cylinder head. It produces 3,571 horsepower at standby rating. The engine uses high-pressure common rail electronic fuel injection and is EPA Tier 2 Certified for Stationary Emergency applications.

What is the fuel consumption of the Generac SD2250/MD2250?

At standby rating on ultra-low-sulfur diesel #2, the SD2250/MD2250 consumes 162.9 gallons per hour at 100% load, 129.2 gph at 75%, 90.2 gph at 50%, and 49.8 gph at 25% load. Total fuel pump flow (combustion plus return) is 739 gph (2,800 Lph). Fuel pump lift is rated at 13.6 feet (4.1 m). ASTM fuel specifications apply with 4-micron fuel filtering required.

What voltages are available for the SD2250/MD2250?

The SD2250/MD2250 is available in two three-phase configurations: 277/480 VAC (3,386.9 amps) and 346/600 VAC (2,709.5 amps), both at 0.8 power factor. The standard alternator 764RSL4063 provides 8,400 skVA motor starting capability at 277/480V with 30% voltage dip. Alternator upsizing options are available from multiple models for different motor starting requirements.

What are the dimensions and weight of the SD2250/MD2250?

The open-set SD2250/MD2250 (without base tank) measures 267 x 113 x 123 inches -- over 22 feet long and nearly 10 feet wide -- and weighs approximately 44,729 lbs (over 20 metric tons). This is a substantial installation requiring engineered foundations, heavy rigging equipment, and careful site planning for delivery and placement access.

What controller does the SD2250/MD2250 use?

The SD2250/MD2250 uses the DSE G8601 controller with advanced PLC functionality, multi-purpose PIDs, virtual inputs, on-screen mimic (SLDs), and an enhanced high-resolution 240x128 pixel display with integral heater and IP65 protection. The controller provides comprehensive protections including ground fault, over/under speed/voltage/frequency/current, and I2T short circuit protection. It supports SNMP, DSENet expansion, and PC configuration.

Generac · SD/MD Series (Industrial Diesel)

Generac SD2250/MD2250

Name: Generac SD2250/MD2250
Brand: Generac
Availability: PreOrder

2250 kW standby · Diesel · Liquid-cooled

2250 kW diesel industrial standby generator. Baudouin 65.6L V12 turbocharged/aftercooled, EPA Tier 2 Certified Stationary Emergency.

Standby power: 2250 kW
Voltage options: 277/480V, 346/600V
Frequency / Phase: 60 Hz · 3-phase
Engine: Baudouin 65.6L · 65.6L
EPA / Emissions: Tier 2
Alternator: Generac 764RSL4063

Commercial Manufacturing Healthcare Data Centers

Configure & Quote Download spec sheet

Overview#

The Generac SD2250/MD2250 is a 2,250-kilowatt industrial diesel generator powered by a Baudouin 65.6-liter V12 turbocharged and aftercooled diesel engine. This unit is EPA Tier 2 Certified for Stationary Emergency applications and represents the upper end of Generac's industrial diesel lineup. The SD2250 and MD2250 designations share the same spec sheet and power platform.

Generac pairs the Baudouin engine with the 764RSL4063 alternator featuring Class H insulation, permanent magnet excitation, sealed ball bearings, and direct-drive coupling with bearing and winding temperature monitoring as a standard feature. The DSE G8601 controller provides comprehensive generator management with advanced PLC functionality, SNMP integration, and IP65-rated display.

The Baudouin 65.6L platform#

The 65.6-liter V12 Baudouin diesel is selected for its proven record in heavy-duty industrial applications. At standby rating, it produces 3,571 horsepower with BMEP of 368 psi and piston speed of 2,538 ft/min. The high-pressure common rail electronic injection system with 4-micron fuel filtering delivers precise fuel metering. The 402-quart (380-liter) oil capacity with gear-driven pump and full-flow spin-on cartridge filtration supports the heavy-duty operating requirements. The 72-inch pusher fan provides 90,000 cfm airflow across the radiator, and the coolant system holds 174.3 gallons.

Our service experience#

The SD2250/MD2250 is a mission-critical installation typically specified for large hospitals, data center campuses, and heavy industrial complexes. At nearly 45,000 lbs and over 22 feet long, site logistics -- including foundation engineering, crane access, and delivery routing -- are a major consideration. Fuel consumption of 162.9 gph at full load demands substantial bulk fuel storage and reliable fuel supply logistics. The high-pressure common rail injection system requires ultra-clean fuel; we strongly recommend duplex fuel-water separators (available as a configurable option) and regular fuel quality testing for standby applications where fuel sits for extended periods. The 380-liter oil system requires commercial-scale fluid handling equipment for oil changes. Given the critical nature of facilities served at this capacity, we recommend comprehensive service contracts with guaranteed emergency response times.

Engineering specifications

Physical

Length: 267 in
Width: 113 in
Height: 123 in
Dry weight: 44,729 lb

Fuel system & runtime

Fuel use @ full load: 162.9 GPH
Fuel use @ 75% load: 129.2 GPH
Fuel use @ 50% load: 90.2 GPH

Thermal & ventilation

Exhaust flow: 21,700 CFM
Exhaust temp: 1022 °F
Combustion air: 6,861 CFM

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

Ready to order this model?

Configure your Generac SD2250/MD2250

Lock the enclosure, fuel system, transfer switch, and add-ons — we'll confirm pricing, availability, and lead time within one business day. Prefer a free-form quote? That option is still here.

Configure & Quote →Just request a quote Download datasheet

Estimate runtime for the Generac SD2250/MD2250

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

Fuel tank capacity

gal

Load

Override full-load GPH (optional)

GPH

Estimated runtime

1.6 hours(0.1 days)

Fuel consumption ≈ 125.67 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Generac SD2250/MD2250 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 1000 hours
Fuel filter: Every 500 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
Fuel quality / degradation	Hard starting, injector fouling, filter clogging, reduced power output	4,380+	moderate
Turbocharger	Power loss, excessive smoke under load, oil consumption	15,000+	moderate
High pressure common rail injection system	Rough running, misfiring cylinders, fuel rail pressure faults	20,000+	severe
Battery (24 VDC system)	Failed to start, slow cranking	8,760+	minor
Coolant heater	Low coolant temperature alarm, slow start in cold weather	20,000+	minor

Frequently Asked Questions

What engine does the Generac SD2250/MD2250 use?: The SD2250/MD2250 uses a Baudouin 65.6-liter V12 turbocharged and aftercooled diesel engine running at 1800 RPM. The engine has a bore of 7.08 inches (180 mm), stroke of 8.46 inches (215 mm), and 16.5:1 compression ratio with a 4-valve cylinder head. It produces 3,571 horsepower at standby rating. The engine uses high-pressure common rail electronic fuel injection and is EPA Tier 2 Certified for Stationary Emergency applications.
What is the fuel consumption of the Generac SD2250/MD2250?: At standby rating on ultra-low-sulfur diesel #2, the SD2250/MD2250 consumes 162.9 gallons per hour at 100% load, 129.2 gph at 75%, 90.2 gph at 50%, and 49.8 gph at 25% load. Total fuel pump flow (combustion plus return) is 739 gph (2,800 Lph). Fuel pump lift is rated at 13.6 feet (4.1 m). ASTM fuel specifications apply with 4-micron fuel filtering required.
What voltages are available for the SD2250/MD2250?: The SD2250/MD2250 is available in two three-phase configurations: 277/480 VAC (3,386.9 amps) and 346/600 VAC (2,709.5 amps), both at 0.8 power factor. The standard alternator 764RSL4063 provides 8,400 skVA motor starting capability at 277/480V with 30% voltage dip. Alternator upsizing options are available from multiple models for different motor starting requirements.
What are the dimensions and weight of the SD2250/MD2250?: The open-set SD2250/MD2250 (without base tank) measures 267 x 113 x 123 inches -- over 22 feet long and nearly 10 feet wide -- and weighs approximately 44,729 lbs (over 20 metric tons). This is a substantial installation requiring engineered foundations, heavy rigging equipment, and careful site planning for delivery and placement access.
What controller does the SD2250/MD2250 use?: The SD2250/MD2250 uses the DSE G8601 controller with advanced PLC functionality, multi-purpose PIDs, virtual inputs, on-screen mimic (SLDs), and an enhanced high-resolution 240x128 pixel display with integral heater and IP65 protection. The controller provides comprehensive protections including ground fault, over/under speed/voltage/frequency/current, and I2T short circuit protection. It supports SNMP, DSENet expansion, and PC configuration.

Compatible equipment

Transfer switches

More in the SD/MD Series (Industrial Diesel)

Generac's largest diesel platform — 2250 to 3000 kW on Baudouin V-engines for mission-critical facilities.

View all 3models in this series →

Similar models

Generac

Generac SD1500

1500 kW industrial diesel with Mitsubishi engine. Cost-effective alternative to CAT 3512 class. Multi-MW paralleling.

1.5 MW standby · Diesel · Liquid-cooled

1500 kW diesel standby for Tier IV data centers, university campuses, and major industrial plants.

1,500 kW standby diesel generator with Mitsubishi S16R-Y2PTAW-1 65.4L V16 engine. EPA Tier 2 certified. Three-phase 277/480V and 346/600V. UL2200 listed.

Tier 23-phasecommercial-standbyindustrial-standby

Generac

Generac SD2500/MD2500

2500 kW diesel in SD/MD platform with Baudouin engine. Cost-competitive with CAT 3516B at lower acquisition cost.

2.5 MW standby · Diesel · Liquid-cooled

2500 kW diesel standby for Tier IV data centers, critical infrastructure, and utility peaking.

2500 kW diesel industrial standby generator. Baudouin 65.6L V12 turbocharged/aftercooled, EPA Tier 2 Certified Stationary Emergency. Data Center Ready.

Tier 23-phasecommercial-standbyindustrial

Generac

Generac SD3000/MD3000

3000 kW diesel -- Generac largest unit. Baudouin engine. Competitive with CAT 3516E at lower acquisition cost.

3 MW standby · Diesel · Liquid-cooled

3000 kW diesel standby for hyperscale data centers, campus microgrids, and utility peak shaving.

3000 kW diesel industrial standby generator. Baudouin 87.5L V16 turbocharged/aftercooled, EPA Tier 2 Certified Stationary Emergency.

Tier 23-phasecommercial-standbyindustrial

Need service or parts for the Generac SD2250/MD2250?

We service every major OEM and stock genuine parts for the most common models.

Get A Quote Or call (209) 229-1990