2025 Generac Mobile Stationary Generators MG300

Information

2025 Generac Mobile Stationary Generators MG300

Keep all your business’s essentials up and running with a Generac 300kW generator. These gas generators are powered by a reliable underground pipeline network that is rarely impacted by weather-related events. 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 SPARK-IGNITED ENGINE
  • Generac builds its spark-ignited engines from the block up utilizing advanced engineering expertise. These are in every 300kW gaseous generator.
INDUSTRIAL ALTERNATOR
  • In our nat gas generators, Generac industrial alternators are machine wound, machine inserted, and machine varnished for the ultimate in consistency.
POWER ZONE™ PRO SYNC CONTROLLER
  • 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.
GENERATOR PARALLELING
  • 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.

Photos

Highlights

  • Muncy, Pennsylvania
  • 2025
  • Generac Mobile
  • Stationary Generators MG300
  • Natural Gas
  • Available
  • Open Set (Includes Exhaust Flex): 57.1 in (1,450 mm) | Weather Protected Enclosure: 57.5 in (1,461 mm) | Level 1 Sound Attenuated Enclosure: 57.5 in (1,461 mm) | Level 2 Sound Attenuated Enclosure: 57.5 in (1,461 mm) | Level 3 Sound Attenuated Enclosure: 63.7 in (1,618 mm)
  • Open Set (Includes Exhaust Flex): 67.9 in (1,725 mm) | Weather Protected Enclosure: 77.8 in (1,976 mm) | Level 1 Sound Attenuated Enclosure: 77.8 in (1,976 mm) | Level 2 Sound Attenuated Enclosure: 111.3 in (2,827 mm) | Level 3 Sound Attenuated Enclosure: 128.9 in (3,274 mm)

Specifications

  • 2025
  • Generac Mobile
  • Stationary Generators
  • MG300
  • General
  • Generac
  • 6
  • In-line
  • 864.71 in3 (14.2 L)
  • 5.31 in (135 mm)
  • 6.50 in (165 mm)
  • 9.5:1
  • Air Method: Turbocharged/Aftercooled
  • Electronic
  • Electronic
  • Pressurized Closed Recovery | Closed Coolant Recovery System | UV/Ozone Resistant Hoses | Factory-Installed Radiator | 50/50 Ethylene Glycol Antifreeze | Radiator Drain Extension
  • Standby-Demand Response/Prime Horsepower at Rated kW: 448 hp / 403 hp | Standby-Demand Response/Prime Three-Phase 120/208 VAC @0.8pf: 300 kW/375 kVA, 1,042 Amps / 270 kW/338 kVA, 938 Amps | Standby-Demand Response/Prime Three-Phase 277/480 VAC @0.8pf: 300 kW/375 kVA, 452 Amps / 270 kW/338 kVA, 406 Amps | Standby-Demand Response/Prime Three-Phase 346/600 VAC @0.8pf: 300 kW/375 kVA, 361 Amps / 270 kW/338 kVA, 325 Amps
  • 1,800 RPM / 1,800 RPM
  • Carburetor: Down Draft | NPT Fuel Connection on Frame | Primary and Secondary Fuel Shutoff
  • Natural Gas
  • Standby-Demand Response/Prime 25%: 1,260 scfh (35.7 m3/hr) / 1,200 scfh (34.0 m3/hr) | Standby-Demand Response/Prime 50%: 1,980 scfh (56.1 m3/hr) / 1,860 scfh (52.7 m3/hr) | Standby-Demand Response/Prime 75%: 2,700 scfh (76.5 m3/hr) / 2,460 scfh (69.7 m3/hr) | Standby-Demand Response/Prime 100%: 3,420 scfh (96.8 m3/hr) / 3,120 scfh (88.3 m3/hr)
  • Size: See Battery Index 0161970SBY | Voltage: (2) - 12 VDC
  • Alternator: 57.5 A
  • System Voltage: 24 VDC | Ground Polarity: Negative
  • Standard Model: K0300124Y21 | 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: Single Sealed Ball | Coupling: Direct via Flexible Disc | Voltage Regulator Type: Full Digital | Regulation Accuracy (Steady State): ±0.25% | UL2200 GENprotect™ | Motorized Main Line Circuit Breaker | Class H Insulation Material | 2/3 Pitch | Skewed Stator | Permanent Magnet Excitation | Sealed Bearing | Amortisseur Winding | Full Load Capacity Alternator
  • Frequency Regulation (Steady State): ±0.25%
  • Fan: 1,894 RPM | Standby-Demand Response/Prime Piston: 1,950 ft/min (594 m/min) / 1,950 ft/min (594 m/min)
  • Standby-Demand Response/Prime Maximum Operating Ambient Temperature: 122 °f (50 °C) / 122 °F (50 °C) | Standby-Demand Response/Prime Maximum Operating Ambient Temperature (Before Derate): See Bulletin No. 0199270SSD | Standby-Demand Response/Prime Exhaust Temp (Rated Output - Post Silencer). 1,415 °F (768 °C) / 1,385 °F (752 °C)
  • Oil: Gear
  • Type: Full-Flow with Cartridge
  • Standby-Demand Response/Prime Coolant Flow: 90 gpm (340.7 Lpm) / 90 gpm (340.7 Lpm)
  • Standby-Demand Response/Prime Air Flow (Fan Air Flow Across Radiator): 15,946 scfm (451.5 m3/min) / 15,946 scfm (451.5 m3/min) | Standby-Demand Response/Prime Flow at Rated Power: 540 scfm (15.3 m3/min) / 497 scfm (14.1 m3/min) | Standby-Demand Response/Prime Exhaust Flow (Rated Output): 1,875 scfm (53 m3/min) / 1,698 scfm (48 m3/min)
  • Operating Fuel Pressure: 7 - 11 in H2O (1.7 - 2.7 kPa) | Standby-Demand Response/Prime Maximum Radiator Backpressure: 0.5 in H2O (0.12 kPa) / 0.5 in H2O (0.12 kPa) | BMEP: 227 psi (1,568 kPa) / 205 psi (1,411 kPa) | Standby-Demand Response/Prime Max. Backpressure (Post Silencer). 0.75 inHg (2.54 kPa) / 0.75 inHg (2.54 kPa)
  • Fan Diameter: 34 in (864 mm)
  • Open Set (Includes Exhaust Flex): 136.0 in (3,454 mm) | Weather Protected Enclosure: 174.7 in (4,437 mm) | Level 1 Sound Attenuated Enclosure: 200.2 in (5,085 mm) | Level 2 Sound Attenuated Enclosure: 180.6 in (4,587 mm) | Level 3 Sound Attenuated Enclosure: 207.3 in (5,265 mm)
  • Open Set (Includes Exhaust Flex): 57.1 in (1,450 mm) | Weather Protected Enclosure: 57.5 in (1,461 mm) | Level 1 Sound Attenuated Enclosure: 57.5 in (1,461 mm) | Level 2 Sound Attenuated Enclosure: 57.5 in (1,461 mm) | Level 3 Sound Attenuated Enclosure: 63.7 in (1,618 mm)
  • Open Set (Includes Exhaust Flex): 67.9 in (1,725 mm) | Weather Protected Enclosure: 77.8 in (1,976 mm) | Level 1 Sound Attenuated Enclosure: 77.8 in (1,976 mm) | Level 2 Sound Attenuated Enclosure: 111.3 in (2,827 mm) | Level 3 Sound Attenuated Enclosure: 128.9 in (3,274 mm)
  • Crankcase: 36.2 qt (34.3 L)
  • Standby-Demand Response/Prime Coolant System Capacity: 15 gal (54.9 L) / 15 gal (54.9 L)
  • Open Set (Includes Exhaust Flex): 6,200 - 6,587 lb (2,812 - 2,987 kg) | Weather Protected Enclosure Steel: 7,535 - 7,919 lbs (3,417 - 3,591 kg) | Weather Protected Enclosure Aluminum: 6,978 - 7,359 lbs (3,165 - 3,337 kg) | Level 1 Sound Attenuated Enclosure Steel: 7,770 - 8,273 lbs (3,524 - 3,752 kg) | Level 1 Sound Attenuated Enclosure Aluminum: 7,176 - 7,625 lbs (3,254 - 3,458 kg) | Level 2 Sound Attenuated Enclosure Steel: 8,804 - 9,188 lbs (3,993 - 4,167 kg) | Level 2 Sound Attenuated Enclosure Aluminum: 7,423 - 7,870 lbs (3,366 - 3,569 kg) | Level 3 Sound Attenuated Enclosure Steel: 10,718 - 11,080 lbs (4,861 - 5,025 kg)
  • Number of Main Bearings: 7 | Lifter Type: Solid | Fan Type: Pusher | Oil Drain Extension | Air Cleaner | Fan Guard (Open Set Only) | Factory Filled Oil and Coolant | Radiator Duct Adapter (Open Set Only) | Critical Silencer (Open Set Only) | Oil Temperature Indication and Alarm | 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)
  • Connecting Rods: Steel Alloy | Cylinder Head: Cast Iron | Cylinder Liners: Ductile Iron | Piston Type: Aluminum | Crankshaft Type: Ductile Iron | Intake Valve Material: Special Heat-Resistant Steel | Exhaust Valve Material: High Temp Steel Alloy | Hardened Valve Seats: High Temp Steel Alloy | Stainless Steel Flexible Exhaust Connection | Rubber-Booted Engine Electrical Connections
  • 2 Year Limited Warranty (Standby and Demand Response Rated Units) | 1 Year Limited Warranty (Prime Rated Units)