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  1. #1
    Join Date
    Dec 2007
    Posts
    26

    Default mm 251 on a generator

    can u run a 251 on a bobcat trailblazer or pro 300 if not
    will a guardian system work

  2. #2
    Join Date
    Aug 2007
    Location
    Vancouver BC Canada
    Posts
    605

    Default

    To run a 251 off of a genny, you will need one that is capable of producing around 14Kw.

    I get this figure by multiplying the full load amps of the welder (54Amps I think)by 240 volts.
    This gives you a figure of 12960Watts. add another 2kw as a safety margin and this is what you will need to provide to the welder in order to run the 251 at full load. If you are running at less than full load, you could get away with a smaller Genny but its not a good idea.
    Will it weld? I loooove electricity!

    Miller 251/30A spool
    Syncro200
    Spectrum 625
    O/A
    Precix 5x10 CNC Router12"Z
    Standard modern lathe
    Cheap Chinese mill that does the trick... sort of...
    horizontal 7x12 bandsaw
    Roland XC540 PRO III
    54" laminator
    hammer and screwdriver (most used)
    little dog
    pooper scooper (2nd most used...)

  3. #3
    Join Date
    Aug 2007
    Location
    Vancouver BC Canada
    Posts
    605

    Default

    To run a 251 off of a genny, you will need one that is capable of producing around 14Kw.

    I get this figure by multiplying the full load amps of the welder (54Amps I think)by 240 volts.
    This gives you a figure of 12960Watts. add another 2kw as a safety margin and this is what you will need to provide to the welder in order to run the 251 at full load. If you are running at less than full load, you could get away with a smaller Genny but its not a good idea.
    Will it weld? I loooove electricity!

    Miller 251/30A spool
    Syncro200
    Spectrum 625
    O/A
    Precix 5x10 CNC Router12"Z
    Standard modern lathe
    Cheap Chinese mill that does the trick... sort of...
    horizontal 7x12 bandsaw
    Roland XC540 PRO III
    54" laminator
    hammer and screwdriver (most used)
    little dog
    pooper scooper (2nd most used...)

  4. #4
    Join Date
    Sep 2005
    Location
    Appleton, WI
    Posts
    193

    Default

    Hi,
    The Millermatic 212 models and under will work off of a Bobcat and Trailblazer, unfortunately, the MM 251 will not work very well. Because it uses SCR's, it requires higher amounts of "peak" currents than our generators can supply. From what I've seen of Guardian generators, they will not power that machine either.
    Have a great day!

    John Leisner
    Product Manager
    Miller Electric Mfg. Co.

    Owner and user of:
    Trailblazer 302 and Legend 301
    Smith Dual Guard oxy-fuel system
    Various borrowed Millermatics and Spectrums.

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