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Anyone know amp draw of 12v 29A/350W PS?

Discussion in 'Power Supplies' started by nato595, Oct 4, 2014.

  1. nato595

    nato595 Let's do this!

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    I understand the output specs of my 12v DC / 29A / 350W power supply, but does anyone know how many amps that it draws on 120 AC input?

    Thanks!
     
  2. ԆцряєсϮ

    ԆцряєсϮ Senior Elf

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    Approx 3 Amps fully loaded.
     
  3. AAH

    AAH I love blinky lights :) Community Project Designer

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    Power supplies of this style will be approximately 90% efficient. The output power is 350W (12V x 29A) so the input power is 350/0.9 which is 390W. At 120V this works out to about 3.25A. 110V would be 3.55A and at 240V it'd be 1.6A.
     
  4. OP
    OP
    nato595

    nato595 Let's do this!

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    Great! Thank you for the answers and the formula.
     
  5. nzlongfellow

    nzlongfellow Dennis from NZ

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    Or 12V is 1/10th of 120V so 1/10th of 29A is 2.9A as a rough guide or 12V is 1/20th of 240V so 1/20th of 29 A is 1.45A (Excluding inefficiencies.)
     

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