2025 Generac Mobile Stationary Generators MG400
- Year 2025
- Make Generac Mobile
- Model Stationary Generators
2025 Generac Mobile Stationary Generators MG400
2025 Generac Mobile Stationary Generators MG400
Keep all your business’s essentials up and running with a Generac 400kW generator. It provides longer run times so everything can continue to operate effortlessly until power is restored. All of our industrial gas generators are completely cost effective and give you the best value for the output so you can afford more of what you need for your business. Generac is one of North America’s largest suppliers of power generation equipment. For more than five decades, Generac has designed and manufactured diesel, natural gas, and bi-fuel generators that meet the demands of any application.
Features may include:
GENERATOR ENCLOSURE- Generac manufactures its own enclosures, ensuring each unit combines the highest level of durability, noise reduction, weather resistance, and streamlined design.
- Generac builds its spark-ignited engines from the block up utilizing advanced engineering expertise.
- Generac industrial alternators are machine wound, machine inserted, and machine varnished for the ultimate in consistency.
- The Generac Power Zone® Digital Control Platform is a fully integrated and multipurpose family of controllers for Generac’s single genset and Modular Power Systems (MPS) applications.
- Generac's Modular Power Systems (MPS) boast a rate of up to 99.999% reliability, and are more cost-effective and flexible than single generators with the same load capacity.
Engine
Engine Manufacturer
Generac
Cylinder Liners
12
Engine Type
12
Displacement
1,336.4 in3 (21.9 L)
Bore
5.03 in (128 mm)
Stroke
5.60 in (142 mm)
Compression Ratio
10.0:1
Intake Design
Air Method: Turbocharged/Aftercooled
Ignition
Electronic
Governor
Electronic
Cooling
Pressurized Closed Recovery | Closed Coolant Recovery System | UV/Ozone Resistant Hoses | Factory-Installed Radiator | 50/50 Ethylene Glycol Antifreeze | Radiator Drain Extension
Engine Power
Standby-Demand Response/Prime Horsepower at Rated kW: 589 hp/ 530 hp | Standby-Demand Response/Prime Three-Phase 277/480 VAC @0.8pf: 400 kW/500 kVA, 602 Amps / 360 kW/450 kVA, 542 Amps | Standby-Demand Response/Prime Three-Phase 346/600 VAC @0.8pf: 400 kW/500 kVA, 482 Amps / 360 kW/450 kVA, 434 Amps
Rated Engine Speed
Standby-Demand Response/Prime: 1,800 RPM/ 1,800 RPM
Fuel System
Fuel Type
Natural Gas
Fuel System
Carburetor: Down Draft | NPT Fuel Connection on Frame | Primary and Secondary Fuel Shutoff
Fuel Usage, 100% Load
Standby-Demand Response/Prime 25%: 1,680 scfh (47.6 m3/hr) / 1,620 scfh (45.9 m3/hr) | Standby-Demand Response/Prime 50%: 2,640 scfh (74.8 m3/hr) / 2,460 scfh (69.7 m3/hr) | Standby-Demand Response/Prime 75%: 3,600 scfh (101.9 m3/hr) / 3,300 scfh (93.4 m3/hr) | Standby-Demand Response/Prime 100%: 4,620 scfh (130.8 m3/hr) / 4,200 scfh (118.9 m3/hr)
Battery
Battery
Size: See Battery Index 0161970SBY | Voltage: (2) - 12 VDC
Battery Charger Input
Alternator: 57 A
Electric
Electrical
System Voltage: 24 VDC | Ground Polarity: Negative
Alternator
Standard Model: K0400124Y21 | Poles: 4 | Field Type: Revolving | Insulation Class - Rotor: H | Insulation Class - Stator: H | Total Harmonic Distortion: <5% (3-Phase) | Telephone Interference Factor (TIF): <52 | Standard Excitation: Permanent Magnet | Bearings: Sealed Ball | Coupling: Direct via Flexible Disc | Voltage Regulator Type: Full Digital | Regulation Accuracy (Steady State): ±0.25% | UL2200 GENprotect™ | Class H Insulation Material | 2/3 Pitch | Skewed Stator | Permanent Magnet Excitation | Sealed Bearing | Amortisseur Winding | Full Load Capacity Alternator
Operational
Operating Conditions
Frequency Regulation (Steady State): ±0.25%
Operating Speed
Fan: 1,404 RPM | Piston: 1,680 ft/min (512 m/min) / 1,680 st/min (512 m/min)
Operating Temperature, Maximum
Operating Fuel Pressure: 11 - 14 in H2O (2.7 - 3.5 kPa) | Maximum Operating Ambient Temperature: 122 °F (50 °C) / 122 °F (50 °C) | Maximum Operating Ambient Temperature (Before Derate): See Bulletin No. 0199270SSD | Exhaust Temp (Rated Output - Post Silencer): 1,297 °F (702.8 °C) / 1,277 °f (691.7 °C)
Hydraulics
Pump Type
Oil: Gear
Oil Filter
Type: Full-Flow Spin-On Cartridge
Hydraulic Flow
Standby-Demand Response/Prime Coolant Flow: 211 gpm (799 Lpm) / 211 gpm (799 Lpm)
Airflow
Standby-Demand Response/Prime Air Flow (Fan Air Flow Across Radiator): 28,004 scfm (793 m3/min) / 28,004 scfm (793 m3/min) | Standby-Demand Response/Prime Flow at Rated Power: 731 scfm (20.7 m3/min) / 666 scfm (18.9 m3/min) | Standby-Demand Response/Prime Exhaust Flow (Rated Output): 2,378 scfm (67.3 m3/min) / 2,142 scfm (60.7 m3/min)
Maximum Pressure
Standby-Demand Response/Prime Maximum Radiator Backpressure: 0.5 in H2O (0.12 kPa) / 0.5 in H2O (0.12 kPa) | Max. Backpressure (Post Silencer): 0.75 in Hg(2.54 kPa) / 0.75 in Hg(2.54 kPa)
Dimensions
Dimensions
Fan Diameter: 44 in (1,118 mm)
Length
Open Set (Includes Exhaust Flex): 154.4 in (3,922 mm) | Weather Protected Enclosure: 207.4 in (5,268 mm) | Level 1 Sound Attenuated Enclosure: 207.4 in (5,268 mm) | Level 3 Sound Attenuated Enclosure: 232.0 in (5,893 mm)
Width
Open Set (Includes Exhaust Flex): 71.0 in (1,803 mm) | Weather Protected Enclosure: 71.0 in (1,803 mm) | Level 1 Sound Attenuated Enclosure: 71.0 in (1,803 mm) | Level 3 Sound Attenuated Enclosure: 76.9 in (1,953 mm)
Height
Open Set (Includes Exhaust Flex): 66.5 in (1,689 mm) | Weather Protected Enclosure: 80.0 in (2,032 mm) | Level 1 Sound Attenuated Enclosure: 114.1 in (2,898 mm) | Level 3 Sound Attenuated Enclosure: 129.2 kg (3,282 mm)
Capacities
Oil capacity
Crankcase: 31.7 qt (30 L)
Cooling System
Standby-Demand Response/Prime Coolant Capacity: 15.5 gal (58.7 L) / 15.5 gal (58.7 L)
Weights
Weight
Open Set (Includes Exhaust Flex): 7,286 - 8,650 lbs (3,304 - 3,923 kg) | Weather Protected Enclosure Steel: 9,490 - 10,840 lbs (4,304 - 4,916 kg) | Weather Protected Enclosure Aluminum: 8,404 - 9,753 lbs (3,811 - 4,423 kg) | Level 1 Sound Attenuated Enclosure Steel: 10,836 - 12,185 lbs (4,914 - 5,526 kg) | Level 1 Sound Attenuated Enclosure Aluminum: 8,963 - 10,330 lbs (4,065 - 4,685 kg) | Level 3 Sound Attenuated Enclosure: 13,224 - 14,285 lbs (5,997 - 6,478 kg)
Features
Features
Number of Main Bearings: 7 | Fan Type: Pusher | Lifter Type: Solid | Oil Drain Extension | Air Cleaner | Factory Filled Oil and Coolant | Engine Coolant Heater | Radiator Duct Adapter (Open Set Only) | Critical Silencer | Battery Charging Alternator | Battery Cables | Battery Tray | Solenoid Activated Starter Motor | Internal Genset Vibration Isolation | Separation of Circuits - High/Low Voltage | Separation of Circuits - Multiple Breakers | Wrapped Exhaust Piping | Standard Factory Testing | Silencer Mounted in the Discharge Hood (Enclosed Units Only)
Construction Material
Connecting Rods: Steel Alloy | Cylinder Head: Cast Iron | Cylinder Liners: Cast Steel Alloy | Piston Type: Cast Aluminum Alloy | Crankshaft Type: Steel | Intake Valve Material: High Temp Steel Alloy | Exhaust Valve Material: High Temp Steel Alloy | Hardened Valve Seats: Proprietary Alloy | Stainless Steel Flexible Exhaust Connection | Rubber-Booted Engine Electrical Connections
Warranty
Warranty
2 Year Limited Warranty (Standby and Demand Response Rated Units) | 1 Year Limited Warranty (Prime Rated Units)