Current Generac Mobile Stationary Generators

2025 Generac Mobile Stationary Generators MD300

2025 Generac Mobile Stationary Generators MD300

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  • Model Stationary Generators
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2025 Generac Mobile Stationary Generators MD300

2025 Generac Mobile Stationary Generators MD300

  • Year 2025
  • Manufacturer Generac Mobile
  • Model Name Stationary Generators
  • Trim Name MD300
  • Generic Type (Primary) General
  • Engine Manufacturer Iveco/FPT
  • Emissions EPA Emissions Compliance: Stationary Emergency | EPA Emissions Reference: See Emission Data Sheet
  • Cylinder Liners 6
  • Engine Type In-Line | Direct Injection
  • Displacement 628.54 in3 (10.3 L)
  • Bore 4.92 in (125 mm)
  • Stroke 5.51 in (140 mm)
  • Compression Ratio 16.5:1
  • Intake Design Air Method: Turbocharged/Aftercooled
  • Governor Electronic Isochronous
  • Cooling Closed Recovery | Closed Coolant Recovery System | UV/Ozone Resistant Hoses | Factory-Installed Radiator | Radiator Drain Extension | 50/50 Ethylene Glycol Antifreeze | 240 VAC Engine Coolant Heater
  • Engine Power Standby/Prime Horsepower at Rated kW: 480 hp / 432 hp | SD-Only Three-Phase 120/208 VAC @0.8p (Standby): 300 kW / 1,041 Amps | SD-Only Three-Phase 120/240 VAC @0.8pf (Standby): 300 kW / 902 Amps | SD-Only Three-Phase 277/480 VAC @0.8pf (Standby): 300 kW / 451 Amps | Three-Phase 346/600 VAC @0.8pf (Standby): 300 kW / 361 Amps | MD-Only Three-Phase 120/208 VAC @0.8pf (Standby): 270 kW / 937 Amps | MD-Only Three-Phase 120/240 VAC @0.8pf (Standby). 270 kW / 406 Amps | MD-Only Three-Phase 346/600 VAC @0.8pf (Standby): 270 kW / 325 Amps
  • Rated Engine Speed Standby/Prime: 1,800 RPM / 1,800 RPM

2025 Generac Mobile Stationary Generators MD300

Integrated paralleling through our Modular Power System (MPS) means you can "plug and play" additional generators into your system when your power demands change. And the additional units could be natural gas or bi-fuel, to give vastly extended run times that are usually unaffected by weather events. Simple and economical.

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.
INDUSTRIAL ALTERNATOR
  • Generac industrial alternators are machine wound, machine inserted, and machine varnished for the ultimate in consistency.
POWERMANAGER® CONTROLLER
  • Generac engineers its generator controls with safety and convenience as top priorities.
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.

Engine

Engine Manufacturer Iveco/FPT
Emissions EPA Emissions Compliance: Stationary Emergency | EPA Emissions Reference: See Emission Data Sheet
Cylinder Liners 6
Engine Type In-Line | Direct Injection
Displacement 628.54 in3 (10.3 L)
Bore 4.92 in (125 mm)
Stroke 5.51 in (140 mm)
Compression Ratio 16.5:1
Intake Design Air Method: Turbocharged/Aftercooled
Governor Electronic Isochronous
Cooling Closed Recovery | Closed Coolant Recovery System | UV/Ozone Resistant Hoses | Factory-Installed Radiator | Radiator Drain Extension | 50/50 Ethylene Glycol Antifreeze | 240 VAC Engine Coolant Heater
Engine Power Standby/Prime Horsepower at Rated kW: 480 hp / 432 hp | SD-Only Three-Phase 120/208 VAC @0.8p (Standby): 300 kW / 1,041 Amps | SD-Only Three-Phase 120/240 VAC @0.8pf (Standby): 300 kW / 902 Amps | SD-Only Three-Phase 277/480 VAC @0.8pf (Standby): 300 kW / 451 Amps | Three-Phase 346/600 VAC @0.8pf (Standby): 300 kW / 361 Amps | MD-Only Three-Phase 120/208 VAC @0.8pf (Standby): 270 kW / 937 Amps | MD-Only Three-Phase 120/240 VAC @0.8pf (Standby). 270 kW / 406 Amps | MD-Only Three-Phase 346/600 VAC @0.8pf (Standby): 270 kW / 325 Amps
Rated Engine Speed Standby/Prime: 1,800 RPM / 1,800 RPM

Fuel System

Fuel Type Ultra Low Sulfur Diesel Fuel #2 | Specifications. ASTM
Fuel Injection Common Rail
Fuel System Filtering (Microns): 5 | Fuel Lockoff Solenoid | Primary Fuel Filter
Fuel Usage, 100% Load Standby/Prime (MD-Only) 25%: 7.6 gph (28.7 Lph) / 6.9 gph (26.1 Lph) | Standby/Prime (MD-Only) 50%: 12.6 gph (47.7 Lph) / 11.6 gph (43.9 Lph) | Standby/Prime (MD-Only) 75%: 17.4 gph (65.9 Lph) / 15.8 gph (59.8 Lph) | Standby/Prime (MD-Only) 100% 22.1 gph (83.7 Lph) / 19.9 gph (75.3 Lph)

Battery

Battery Size: See Battery Index 0161970SBY | Voltage: (2)–12 VDC
Battery Charger Input Alternator: Standard

Electric

Electrical System Voltage: 24 VDC | Ground Polarity: Negative
Alternator Standard Model: SD-Only- K0350124Y21 / MD-Only- Generac 520 mm | 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 Cartridge | Coupling: Direct via Flexible Disc | Load Capacity- Standby: 100% | Voltage Regulator Type: Digital | Regulation Accuracy (Steady State): ±0.25% | MD-Only: GENprotect™ | UL2200 GENprotect™ | 12 Leads (3-Phase, Non 600V) | Class H Insulation Material | Vented Rotor | 2/3 Pitch | Skewed Stator | Auxiliary Voltage Regulator Power Winding | Permanent Magnet Excitation | Sealed Bearing | Automated Manufacturing (Winding, Insertion, Lacing, Varnishing) | Rotor Dynamically Spin Balanced | Amortisseur Winding | Full Load Capacity Alternator | MD-Only: Protective Thermal Switch

Operational

Operating Conditions Frequency Regulation (Steady State): ±0.25% | Standby/Prime Heat Rejection to Coolant: 814,783 BTU/hr (238 kW) / 733,673 BTU/hr
Operating Speed Fan: 2,250 RPM | Standby/Prime Piston: 1,654 ft/min (504 m/min) / 1,654 ft/min
Operating Temperature, Maximum Standby/Prime Maximum Operating Radiator Air Temperature: 122 °F (50 °C) / 122 °F (50 °C) | Maximum Operating Ambient Temperature (Before Derate): See Bulletin No. 0199280SSD | Standby/Prime MD-Only Exhaust Temperature (Rated Output - Post Silencer): 1,020 °F (549 °C) / 918 °F (492 °C)

Hydraulics

Pump Type Oil: Gear | Water: Pre-Lubed, Self Sealing | Fuel Inject Make: Electronic | Fuel: Engine Driven Gear
Oil Filter Type: Full-Flow
Hydraulic Flow Total Fuel Pump Flow (Combustion + Return): 31 gph (117 Lph) | Standby/Prime Coolant Flow: 95 gpm (360 Lpm) / 95 gpm (360 Lpm)
Airflow Standby/Prime Inlet Air cfm (m³/hr): 14,505 cfm (411 m3/hr) / 14,505 cfm (411 m3/hr) | Standby/Prime Flow at Rated Power: 850 cfm (24.1 m3/min) / 765 cfm (21.67 m3/min) | Standby/Prime Exhaust Flow (Rated Output): 2,240 cfm (63.4 m3/min) / 2016 cfm (57.1 m3/min)
Maximum Pressure Standby/Prime Maximum Additional Radiator Backpressure: 0.5 in H2O (0.12 kPa) / 0.5 in H2O (0.12 kPa) | Standby/Prime BMEP: 336 psi (2,317 kPa) / 302 psi | Standby/ Prime MD-Only Maximum Backpressure (Post Silencer): 1.5 inHg (5.1 kPa) / 1.5 inHg (5.1 kPa)

Dimensions

Dimensions Fan Diameter: 30 in (762 mm) | Fuel Supply Line: 0.5 in (12.7 mm) NPT | Fuel Return Line: 0.5 in (12.7 mm) NPT | Fuel Pump Lift: 3 ft (1 m) | Standby/Prime MD-Only: Exhaust Outlet Size (Open Set): 101.6 mm (4 in) / 101.6 mm (4 in)

Capacities

Oil capacity Crankcase: 31.68 qt (30 L)
Cooling System Standby/Prime Coolant System Capacity: 16.6 gal (63 L) / 16.6 gal (63 L)

Features

Features Cylinder Head: 4–Valve | Fan Type Pusher | Oil Drain Extension | MD-Only: Heavy Duty Air Cleaner | Fan Guard | Factory Filled Oil and Coolant | Radiator Duct Adapter (Open Set Only) | 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 Unit Only)
Construction Material Piston Type: Aluminum | Crankshaft Type: Dropped Forged Steel | Stainless Steel Flexible Exhaust Connection | Rubber-Booted Engine Electrical Connections

Warranty

Warranty 2 Year Extended Limited Warranty (Standby Rated Units) | 1 Year Limited Warranty (Prime Rated Units)

Product Photography