5 KVA Generator & Mig Welder

  1. lumpyweld :-}

    lumpyweld :-} New Member

    Messages:
    3
    scotland
    Hi
    Looking for advice on what is the biggest size of mig I can run on my 5kva petrol generator as I don't have mains power in my shed.
    I currently run a Lincoln v140s stick/tig and it has no problems.
    looking to weld up to 10mm with mig if this is possible ?
     
  2. Munkul

    Munkul Jack of many trades, Master of none

    Messages:
    2,457
    Location:
    Cumbria
    A 210 amp ThermalArc inverter states it needs a 7.5kva generator to run full output, and 10mm plate needs at least 220 amps... so I would say no, it's not possible.

    You'll be able to run probably up to 160 amps if it's a nice efficient inverter, more than that and you'll trip something or let the smoke out of your genny. Less if it's a transformer MIG.

    If you got a 200-220 amp inverter, it will run, just not at full power.
     
    Wonderweaver likes this.
  3. jimbo84 Forum Supporter

    Messages:
    1,225
    Location:
    Up North
    Slightly different in that I only have a tiny mig and larger stick welders.

    My set up is a 4.5kva genny, it’ll run the 85a tranny mig no issues at all. It’ll run the oil filled oxford up to 80 amps fine, next setting up, 100a I think trips it. The inverter stick welder will run at 90-100a but really drags the genny down on start up.
     
  4. lumpyweld :-}

    lumpyweld :-} New Member

    Messages:
    3
    scotland
    Cheers guys,
    just been on phone to Technical Arc in York and looking at a Oxford 240/1 or a Tec Arc prof mig 251, should be able to work with that I have till I get power from mains.
     
  5. Pete.

    Pete. Member

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    9,435
    Location:
    Kent, UK
  6. Justme

    Justme Member

    Messages:
    3,002
    Location:
    Pwllheli Wales
    I have a 6kVa genny & a 210 amp mig.

    You cant go much over 100amps & even then you get the odd cold start.

    Its ok for car stuff. No way you will do 10mm.

    On the 15kVa genny I can run at max settings & no cold starts.

    But thats got a 4 cylinder tractor powering it not a 10hp 400cc single.

    You could multi pass to do 10mm.
     
    Brad93 likes this.
  7. Brad93

    Brad93 M J B Engineering

    Messages:
    9,032
    Location:
    Essex
    You can’t multipass something with inadequate fusion to begin with. You’re just putting a band aid over a cold weld.

    10mm Steel you need between 220-250A all day long to weld with guaranteed fusion.

    You could drop that a bit lower if you used a heavy CO2 mix or gas shielded flux core wire.
     
    Yamhon and Munkul like this.
  8. lumpyweld :-}

    lumpyweld :-} New Member

    Messages:
    3
    scotland
    planning going down the route of flux core wire without gas as most jobs will be out side.
     
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