2025 Generac Mobile Stationary Generators SD1250
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- Model Stationary Generators
2025 Generac Mobile Stationary Generators SD1250
2025 Generac Mobile Stationary Generators SD1250
The Generac D46L diesel generator delivers dependable backup power for facilities that can’t compromise on uptime. Engineered around the modern Perkins D46L EPEAK 12-cylinder engine and paired with the Deep Sea G8601 controller, this platform simplifies installation, reduces complexity, and meets the newest UL2200 3rd Edition safety standards. With shared enclosure components, complete exhaust system, and flexible runtime options, the D46L is the smarter, streamlined solution for 1250–1500 kW applications.
Features may include:
The Generac D46L diesel generator delivers dependable backup power for facilities that can’t compromise on uptime. Engineered around the modern Perkins D46L EPEAK 12-cylinder engine and paired with the Deep Sea G8601 controller, this platform simplifies installation, reduces complexity, and meets the newest UL2200 3rd Edition safety standards. With shared enclosure components, complete exhaust system, and flexible runtime options, the D46L is the smarter, streamlined solution for 1250–1500 kW applications.- Perkins D46L EPEAK 12-cylinder diesel engine provides strong transient response, improved serviceability, and global parts availability. Turbocharged / aftercooled design ensures stable power output under heavy loads.
- Advanced control platform with PLC functionality, Modbus® RTU/TCP, SNMP, integrated data logging, and on-screen system mimic (SLDs).
- Configurable exhaust collector with Hospital and Critical Grade options, providing flexibility on installtions and soundwhile creating a cleaner, more compact installation footprint.
- Generac’s MPS architecture allows multiple units to operate in parallel for up to 99.999 % reliability, easy scalability, and simplified serviceability.
- Flexible breaker configurations (left/right positioning, full-rated amperage) support a wide range of site conditions.
- Cooling System: Pressurized closed-loop with 50/50 ethylene glycol; high-ambient engineered
- Alternator System: Robust built utilizing permanent magnet excitation, low reactance, and both dedicated and re-strapable applications support a versitile offering
- Power Nodes: 1250 kW & 1500 kW
- Ideal For: Data centers, industrial campuses, large commercial buildings, healthcare, utilities, and infrastructure operations.
- Applications: Standby and mission-critical backup power where simplified installation, platform standardization, and long-term reliability matter.
- Footprint: Approx. 219 in L × 95 in W × 99 in H (open set, tank optional)
- Operating Temperature: Designed for high ambient conditions to operate in the most extreme enviornments
- Certifications: UL2200 (3rd Edition), EPA Certified Stationary Emergency, NFPA 110
Engine
Engine Manufacturer
Perkins
Emissions
EPA Emissions Compliance: Tier 2 | EPA Emissions Reference: Contact Factory
Cylinder Liners
12
Engine Type
V Arrangement
Displacement
2,797 in3 (45.84 L)
Bore
6.3 in (160 mm)
Stroke
7.48 in (190 mm)
Compression Ratio
13:8:1
Intake Design
Air Method: Turbocharged/Intercooled
Governor
Electronic
Cooling
Type: Pressurized Closed | Closed Coolant Recovery System | UV/Ozone Resistant Hoses | Factory-Installed Radiator | 50/50 Ethylene Glycol Antifreeze | Radiator Drain Extension | Coolant Catch Can | Finger Guard
Engine Power
Horsepower at Rated kW: 1,853 hp | Three-Phase 277/480 VAC @0.8pf: 1250 kW/1,562.5 kVA / 1,879.4 Amps | Three-Phase 346/600 VAC @0.8pf: 1250 kW/1,562.5 kVA / 1,503.5 Amps
Rated Engine Speed
1,800 RPM
Fuel System
Fuel Type
Ultra Low Sulfur Diesel #2 | Specifications: ASTM
Fuel System
Filtering (Microns): 4 | Flexible Fuel Lines | Primary and Secondary Fuel Filter
Fuel Injection
Type: Electronic
Fuel Usage, 100% Load
25%: 27.4 gph (103.6 Lph) | 50%: 48.1 gph (182.1 Lph) | 75%: 70.2 gph (265.8 Lph) | 100%: 90.2 gph (341.5 Lph)
Battery
Battery
Size: See Battery Index 0161970SBY | Voltage: 12 VDC
Battery Charger Input
Alternator: Standard
Electric
Electrical
System Voltage: 24 VDC | Ground Polarity: Negative
Alternator
Standard Model: K1260064N2M4 | Poles: 4 | Field Type: Revolving | Insulation Class - Rotor: H | Insulation Class - Stator: H | Total Harmonic Distortion: <5% | Telephone Interference Factor (TIF): <50 | Standard Excitation: Permanent Magnet | Bearings: Sealed Ball | Coupling: Direct Drive | Voltage Regulator Type: Digital | Regulation Accuracy (Steady State): ±0.25% | Main Line Circuit Breaker | Class H Insulation Material | 2/3 Pitch | Skewed Stator | Permanent Magnet Excitation | Sealed Bearing | Full Load Capacity Alternato | Drip Cover
Operational
Operating Conditions
Frequency Regulation (Steady State): ±0.25%
Operating Speed
Piston: 2,244 ft/min (683.9 m/min)
Operating Temperature, Maximum
Maximum Operating Ambient Temperature: 122 °F (50 °C) | Maximum Operating Ambient Temperature (Before Derate): Contact Factory | Exhaust Temperature (Rated Output - Post Turbo): 847.4 °f (453 °C)
Run Time Per Tankful
No Tank
Hydraulics
Pump Type
Oil: Gear Driven
Oil Filter
Type: Full Flow Spin-On Cartridge
Injection Pump Type
Fuel: MEUI
Hydraulic Flow
Total Fuel Pump Flow (Combustion + Return): 693 gph (2,622 Lph) | Coolant Flow: 317gpm (1200 Lpm)
Airflow
Air Flow (Fan Air Flow Across Radiator): 64,000 cfm (1812.3 m3/min) | Flow at Rated Power: 4241.3 cfm (120.1 m3/min) | Exhaust Flow (Rated Output): 9831.6 cfm (278.4 m3/min)
Maximum Pressure
Maximum Additional Radiator Backpressure: 0.5 in H2O (0.124 kPa) | BMEP: (291.4 kPa) 2009 psi | Maximum Allowable Back Pressure (Post Turbo): 2.9 inHg (10 kPa)
Dimensions
Dimensions
Fan Diameter: 65 in (1651 mm) | Fuel Supply Line ID. Minimum: 0.75 in (19 mm) | Fuel Return Line ID. Minimum: 0.75 in (19 mm) | Fuel Pump Lift: 78.2 ft (2.5 m)
Length
Open Set: 218.9 in (5,560 mm)
Width
Open Set: 94.4 in (2,398 mm)
Height
Open Set: 98.6 in (2,506 mm)
Capacities
Oil capacity
Crankcase Capacity: 166.4 qt (157.5 L)
Cooling System
Coolant Capacity: 59 gal (223 L)
Weights
Weight
Open Set: 23,488 - 24,987 lbs (10,654 - 11,334 kg)
Features
Features
Cylinder Head: 4–Valve | Fan Type: Pusher | Oil Drain Extension | Air Filter Restriction Indicator | Air Cleaner | Level 1 Fan and Belt Guards | Factory Filled Oil and Coolant | Engine Coolant Heater | Radiator Stone Guard | Oil Cooler | Battery Charging Alternato | Battery Cables | Battery Tray | Solenoid Activated Starter Motor | 20A UL Listed Battery Charger | Separation of Circuits - High/Low Voltage | Separation of Circuits - Multiple Breakers | Standard Factory Testing
Construction Material
Stainless Steel Flexible Exhaust Connection | Rubber-Booted Engine Electrical Connections | Rubber Encapsulated Isolator
Warranty
Warranty
2 Year Limited Warranty (Standby Rated Units)