Generac MDG25IF4 Mobile Diesel Generator Set


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Quiet, easy power in a compact, trailer-mounted package

Standby Power Rating

25 kW / 31 kVA / 60 Hz

Prime Power Rating

20 kW / 25 kVA / 60 Hz

The trailer-mounted Generac MDG25IF4 mobile diesel generator provides 3-phase 20kVA prime power in a compact, sound-insulated steel cabinet. The cabinet design maximizes space and transport efficiency, while making the generator easy to maneuver and tow. It is fully lockable. The Final Tier 4 engine is reliable and easy to maintain, requiring no diesel particulate filter (DPF). Standard safety features enhance performance and on-the-job security. The generator includes a 2-year limited or 2000 hours manufacturer’s warranty, with unlimited hours covered in the first year.

Gensets are configured to meet customer needs including options such as choice of containment, cold weather packages, trailer features and more. Click here for full list of options for the generator and trailer.

To view and compare Generac portable generator model specifications, click here.

Call for details and optional items pricing: 1-866-948-5300


  • Engine
    • Isuzu® 4LE2TAGV08
    • 4 cylinder
    • Turbocharged
    • 134 in3 (2.2 L) displacement
    • EPA Final Tier 4 approved
      • Ultra-low sulphur diesel
    • Prime power @ 1,800 rpm – hp (kW):40 (30)
    • Iso mounted engine supports
    • Paper element air filter with safety cartridge
    • Electronic isochronous governing
    • Fixed-speed fan drive
    • Spin-on cartridge oil filter
  • Systems Output
    • Voltage selection switch: 3-position, lockable switch
      • 1-phase: 120/240 V
      • 3-phase: 120/208 V
      • 3-phase: 277/480 V
    • Control System
      • Deep Sea® LCD controller and display
      • Push buttons for easy operation
      • Backlit LCD text display
      • Multiple language options
      • Configurable timers, alarms, timers, and maintenance alarms
      • Heated display
      • See specifications sheet (click here) for more details
    • Certifications
      • CSA
      • NATM
      • Tier 4 Final Emissions
      • ISO 8528-5
    • Fuel
      • Fuel tank capacity – gal (L)
        • Total:62(234)
        • Usable: 56 (211)
      • Maximum run time @ 100% load: 28 hr
    • Generator
      • 60 Hz engine/generator
      • Marathon Electric® 282PSL1705
        • Brushless
        • 4-pole
        • Class H insulation
      • Electrical Controls
        • Remote start/stop contacts in receptable box
        • Locked control box door with diagnostics window
        • Lockable lug box with safety switch
        • See specifications sheet (click here) for more details

Easy to Use:

  • Large access, removable French style doors
    • Allow for unobstructed access to service components
    • Include slam latches
  • No diesel particulate filter (DPF)
  • 28-hour run time. The 56-gallon tank requires fewer fill-ups for more uptime
  • 13 warning and shutdown features


  • Compact size saves space on the job site
  • Small cabinet allows for 12 units on a flatbed truck
  • Integrated fork pockets and central lifting point allows for easy loading and unloading
  • Lightweight – can be towed by most work trucks and SUVs
  • Heavy gauge steel trailer

Safety Features

  • External E-Stop is easy to locate and access in emergency situations
  • Interior cabinet and control panel lighting for enhanced visibility
  • Phase switch safety shutdown
  • Access doors with auto shutdown separates main breaker access from load cables; unit automatically shuts down if the lug door is opened
  • Controller is located on rear of the unit away from power wires and service points and is lockable for security and safety
  • Fuel access is lockable and located away from power distribution
  • LED Trailer lights
  • 13 warning and shutdown features
  • See specifications sheet (click here) for more details







Specification Sheet Operation Manual


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