30 Mar 2020

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Miller Big Blue 800X Duo Air Pak with ArcReach NEW

Dual Operator. Increased Efficiency. More Power


The most powerful diesel generator in the industry.

Dual VRD.

800 Amps of weld power and 27,000 watts of peak generator power.

One dependable engine — two independent arcs with up to 400 Amps each.

Where to Buy

Product Overview


  • Pipe Welding
  • Maintenance & Repair Rigs
  • Mechanical Contractor
  • Construction
  • Mining Maintenance
  • Railroad Maintenance

What's In The Box

  • Big Blue 800X Duo Air Pak with ArcReach Machine


For details, refer to the Miller warranty statement.

ArcReach Technology

The Big Blue 800X Dup Air Pak with ArcReach welding technology - minimises the non-value-added time spent walking to and from the power source - and maximises arc-on time, weld quality and jobsite safety.

More Power

800 Amps of weld power and 27,000 watts of peak generator power.

Multi-Arc Welding

One dependable engine — two independent arcs with up to 400 Amps each. Or plug in an additional inverter for a true multi operator work platform! Example: Two additional XMT multi-process machines equals 4 operators, up to 200 Amps each. Premium quality arcs allow operators to work independently with no arc interaction. Multi operator welding has never been easier or more versatile.

Ingersoll Rand

Ultra-reliable industrial rotary screw compressor. 30,000-hour life expectancy. Independent on/off control for applications not requiring compressed air — allows greater fuel savings and longer compressor service intervals.

Auto Remote Sense™

Standard 14-pin receptacle. For simple connection of remote controls and wire feeders.

HD Powder Coat

With zinc-rich primer protects sheet metal from rust and corrosion.

Increased Efficiency

More arcs and better fuel economy equal increased profits for your business. Estimated savings are 34 percent with a dual-operator unit versus two single operator units.

Digital Meters

SunVision technology enables welding parameters to be viewed with greater clarity than analogue meters at virtually any angle. Meters can be seen clearly even in direct sunlight.

Auxiliary Power*

  • 1 x 415-380V
  • 32 Amp Sockets
  • 2 X 240 V 15 Amp Sockets
  • RCD

*Generator auxiliary power is 60Hz, and intended for operating equipment associated with welding, such as angle grinders, drills and floodlights. Some Australian 50Hz equipment incorporating induction motors, such as pumps, fans, air compressors, refrigeration or air conditioners, may not operate correctly and could be damaged. Refer to appliance supplier or manufacturer to confirm suitability.

Arc Control

Beneficial when welding with stick and solid wires for easier fine tuning of tough-to-weld materials and out-of-position applications.

Simple Paralleling Switch

Makes switching from a single operator to dual operators a breeze. Weld up to 400 Amps per side when set up in dual-operator mode, or up to 800 Amps in single-operator mode.

20,000 Watts of Pure Generator Power

Plug in an extra Miller inverter-based power source for a second welding arc.

Heavy-duty Low Speed T4I Industrial Diesel Engines

Electronic Engine Display

Simultaneously displays fuel level, engine hours, coolant temperature, oil pressure, battery volts, engine rpm, and air pressure. It also tracks oil change intervals, compressor hours, and displays engine diagnostics for quick and easy servicing.

Standard Features

  • ArcReach
  • Digital preset weld meters


  • MIG
  • Submerged Arc
  • Stick
  • TIG
  • 1 Phase
  • 3 Phase
  • Rated Output
    1 Welder: 800 A at 38 V, 100% Duty Cycle
    2 Welders: 400 A at 36 V, 100% Duty Cycle
  • Generator Continuous Power
    1 Phase: 4,000 watts (independent of weld output)
    3 Phase: 20,000 watts (dependent of weld output)
  • Generator Peak Power
    1 Phase: 5,500 watts
    1 Phase: 27,000 watts
  • Rated Carbon Diameter
    12.7 mm
  • Current Type
  • Max Open Circuit Voltage
    85 VDC
  • Amperage Range
    20 - 800
  • Weld Output
    CC / CV
  • Dimensions (mm)
    H: 1168
    H: 1359 (top of exhaust)
    W: 724
    D: 1765
  • Weight (without fuel)
    917kg – Additional 75kg when fuel tank is full
  • Shipping Weight (without fuel)

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