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Unknown wattage of machine advice

Discussion in 'Electrics UK' started by ipbr21054, 16 Jan 2021.

  1. ipbr21054

    ipbr21054

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    Hi,
    I have a small machine which runs off 240v but I have no idea of the wattage of its motor of which I need to know.

    Can I check this somehow by using the British Gas energy meter, this is the small screen that you plug in the mains to check how much certain things are costing to run.
    This just popped into my head but not sure if it’s even possible to get my answer this way.
    Please advise thanks.
     
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  3. big-all

    big-all

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    what is it ?
    does it have a ratings plate
    does it have a fuse
    picture may help
     
  4. ipbr21054

    ipbr21054

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    It’s a small key cutting machine.
    I don’t see any spec plate on it hence this post.

    It runs from a 12v internal battery BUT there is a laptop type charger which I connect to the cutter & then 240v mains, it can also run when this charger is connected.

    Will it help if I get the info from the charger ?
     
  5. big-all

    big-all

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    i would suspect less than 1amp at 230v
    yes get the charger output and at 12v say 6amps assuming really really inneficient[50%] is only 60w at 240v
     
  6. ipbr21054

    ipbr21054

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    So you sure saying 60w or less ?
     
  7. big-all

    big-all

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    230vx1 amp =230w
    12vx19amp =228w
    so 6amp will be 30% ish at 240 v =76w plus loses perhaps 100w
     
  8. ipbr21054

    ipbr21054

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    So we say 100w
     
  9. EFLImpudence

    EFLImpudence

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    It'll help.
     
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  11. big-all

    big-all

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    assuming the output at12v is 6ah or less
     
  12. ipbr21054

    ipbr21054

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    Attached is the label from the charger.
     

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  13. big-all

    big-all

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    to keep it simple
    amps at 12v x15=watts at 230v this allows for a small bit off loss
    so 8x15= so 120w at 230v
    although it does say 1.2 ah so you must assume 276w although thats more likly to be at120v but allow 300w any way at 230v
     
  14. EFLImpudence

    EFLImpudence

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    Probably a bit less than the 8A of the charger.
     
  15. ipbr21054

    ipbr21054

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    Not being rude but assume the person who’s reading this isn’t an electronics person.

    I can’t decipher this.
    Just need a value of which is close in Watts.
     
  16. SFK

    SFK

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    It is showing as between
    104W (= 13V x 8A)
    and
    120W (=100V x 1.2A)
    and
    288W (= 240V * 1.2A)

    In basic numbers it is drawing an absolute maximum of 300W, but most likely arround 120W.
     
    Last edited: 17 Jan 2021
  17. ipbr21054

    ipbr21054

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    Many thanks.
    300w it is
     
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