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Dont want to blow up my welder.

Discussion in 'General Electronics Discussion' started by Neil Deaves, May 10, 2017.

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  1. Neil Deaves

    Neil Deaves

    May 10, 2017
    HI i will get through the preamble as quickly as poss. I need help because i'm an ordinary person and not made of money.
    My problem is

    I have an inverter welder .
    i need to use to repair my project car in a place with no mains supply.
    inverter welders are well known to blow up on portable generators possibly because of supply variations.
    i cant afford an inverter generator. i can just afford a used genny.
    my welder needs 230v, 50 hz at max 21 amp but i could get by on about 16 amp.
    i've thought about trying to find a used single phase 230v to 230v motor inverter /speed controller would either work
    any other suggestions welcome, as a mech eng i'm happy to make or adapt anything, problem always is money and lack of maths

    Thanks for any help
  2. duke37


    Jan 9, 2011
    I do not understand the story. What you need is an alternator capable of 5kW plus.
    A welder is a horrible load and an alternator may not be able to handle the variations. Also the invertor rectifies the mains which distorts the waveform. One alternator that i played with needed a 2kW resistive load to make it behave.
    You will need a 10kW engine to give a reasonably constant speed. If you have a tractor, then a PTO alternator would be my favorite solution.

    My brother used an aircraft DC generator driven by a tractor. Voltage was controlled by engine speed and current with yards of iron wire resistors. This Heath Robinson system needed very sophisticated driving which I never managed.
    Neil Deaves likes this.
  3. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    The welder is a horrible load because it's essentially a short circuit every time you strike an arc.
    I agree with duke37 that you need upwards of 5kw. It's doubtful 16amps is enough. I wouldn't chance it. I would go with at least 7kw.
    I don't see it being less expensive using an alternator either.

    It's a lot slower but you could always weld with an oxy/acetylene torch.
    Neil Deaves likes this.
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