240v mig & generator what KVA?

  1. PhilTalon

    PhilTalon Member

    Messages:
    13
    Location:
    Uk united states of Essex
    I've googled this and now I'm just confused by conflicting answers so...
    If a 300amp inverter mig runs off a 16amp 240v supply what KVA generator do I need to run it with out having nuisance breaker trips every minute?
     
  2. Richard.

    Richard. Member

    Messages:
    16,363
    Location:
    Cambridgeshire
    I’ve not known of a 300 amp mig to run off a 230/16 unless your using it at the lower end. I’m not surprised it’s tripping.
    Big gen set required to run that in its prime settings.
     
  3. pedrobedro

    pedrobedro Man at Matalan

    Messages:
    8,997
    Location:
    CX Derbyshire
    My 180 inverter mig recommends a minimum 5Kva and preferably 8Kva to run so a 300 is going to need a lot to run top end.
     
  4. Badger1bear

    Badger1bear If your not on fire, then your too far away

    Messages:
    1,933
    Location:
    kent
    I would say you would be looking around 12 to 14 kva
    When I asked about my 250 amp lorch I was told at least 10kva
     
  5. Sarto

    Sarto Small flower carts specialist

    Messages:
    411
    Location:
    Padova - Italy
    Hi to all.

    Looking at the Oxford site, I found that:

    Original page:
    http://www.oxfordwelders.co.uk/singlephasemig.html

    MIGMAKER 330-1 - 230V ideal for so many jobs from the thinnest car panel up to heavy plate, perfect for steel fabrication, general maintenance & medium to heavy duty agricultural welding. Our most popular large single phase machine!
    From March 2017 now with 20A min setting!

    RRP £1050+VAT

    Supply Voltage 230V
    Welding Range (amps) 20-330
    Duty cycle -35% @ 330 amps
    Duty cycle -60% @ 250 amps
    Voltage Steps 16
    Mig wire range 0.6-1.2mm
    Size app (ex rear wheels) 350Wx720Lx605H
    Weight approx 80kg
    Input fuse (slow) 32A*
    Min generator size* 6.8KVA

    * Note the input fuse size on single phase models is a result of our calculations & tests, it is possible to use any of these models on a lower fuse size at lower welding power. We recomend always using a 'D' type circuit breaker to avoid intermittant tripping & in some instances you may experience intermittant tripping if using close to maximum settings. *The min KVA rating quoted is for up to 3/4 power output, to achieve max output we suggest increase KVA by 40%.

    So you are looking at a generator about 6.8kVA + 40% = 9.5 - 10 kVA

    Hope this help, a little at least.

    Sart0
     
    Wendelspanswick likes this.
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