Current for 220v hp water pump

Discussion in 'General Electronics Chat' started by Juvi22, May 8, 2015.

  1. Juvi22

    Thread Starter New Member

    May 8, 2015
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    Good day everyone could I get some info Need to get a step up transformer from 220v to 110v for an half hp 220v pump wat would be the current
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,974
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    0.5hp is 373W, so @ 220V thats 1.7amps secondary side, primary side will be at least double that approx 3.5amps.
     
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    The problem with specifying a transformer for that pump is that the locked-rotor = instantaneous start current inrush is about 10X the running current, so the transformer must be able to supply ~30A for a couple of cycles of the AC waveform.
     
  4. Juvi22

    Thread Starter New Member

    May 8, 2015
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    Thanks a lot
     
  5. pafitis

    New Member

    May 8, 2015
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    So one 1/2 hp at 22o volts its equal to 373W
    Now use the formula Watts divided by Volts, hence 373W/22oV makes as 1.69Ampere
     
  6. Juvi22

    Thread Starter New Member

    May 8, 2015
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    Appreciate the answers they were very helpful
     
  7. Reloadron

    Active Member

    Jan 15, 2015
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    1 HP = 746 Watts that is a given. So logically 0.5 HP should be 1/2 of 746 Watts or 373 Watts. Now if someone could show me a motor with those numbers on the name plate that would be really cool. Never thought I would see a perfect motor in my lifetime. Most 1/2 HP motors I have seen draw considerably more, to deliver 0.5 HP many draw in excess of 0.5 KW.

    Ron
     
  8. JWHassler

    Member

    Sep 25, 2013
    201
    33
    Step up from 22V to 110V?
    Also, are you sure that the motor cannot be re-connected for 110V operation? Lots of single-phase motors can be.
     
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