UPS sizing for 27" imac Retina 5k?

Discussion in 'iMac' started by CavemanMike, Jun 18, 2015.

  1. CavemanMike macrumors regular

    Joined:
    Nov 8, 2013
    #1
    I was hoping apple's spec page would simply give me the watts so I could pick an appropriate UPS. It did not:
    http://www.apple.com/imac-with-retina/specs/

    I will have the WD DUo raid'd 4Tb drive, and want enough UPS to support a second drive, with total run time of about 15 minutes.

    Any help would be very helpful.

    Thanks,
    Caveman_Mike
     
  2. CavemanMike thread starter macrumors regular

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    Nov 8, 2013
    #2
  3. dyt1983, Jun 19, 2015
    Last edited: Jun 19, 2015

    dyt1983 macrumors 65816

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    May 6, 2014
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    USA USA USA
    #3
    With the advent of power factor correcting power supplies, the consumption rating isn't so simple. That might be why the max consumptions aren't listed anymore for newer devices with those. But it could be simple, it's like they choose to not make it simple. Just like some stepped-wave UPSes don't play nice with some PFC power supply-equipped computers, although some of each do, so it could be simple.
     
  4. CavemanMike thread starter macrumors regular

    Joined:
    Nov 8, 2013
    #4
    I think I will plug the imac & drive into my other UPS (which has a load meter LCD on the front), to get a sense of about how much power it consumes, then buy accordingly.

    I was hoping to calculate it on paper first, instead of doing measuring experiments.

    Thanks,
    Mike

    PS: Do you think a 750VA is sufficient? (just taking a guess)?
     
  5. dyt1983 macrumors 65816

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    May 6, 2014
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    USA USA USA
    #5
    I usually like to get 1500VA just for as much run time as possible at a reasonable cost... and the 1500VAs on sale usually seem to give the best price/performance value. I used to also calculate it on paper first, but now it's just a guess. Older 27" models were listed as 310W, so that should give you a ballpark!
     
  6. AppleNewton macrumors 68000

    AppleNewton

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    #6
    The 5K iMac and 2012-2015 models PSU are all 300W
     
  7. roadkill401 macrumors 6502

    roadkill401

    Joined:
    Jan 11, 2015
    #7
    I have a 27" i7 retina with the 290x video. My 1200va ups tells me i am pulling 26W and have a 96min runtime. I also have a Synology DS209 plugged in as well as a 3tb LaCie and my asus router.
     
  8. steve23094 macrumors 68000

    steve23094

    Joined:
    Apr 23, 2013
    #8
    Your iMac alone pulls 70W when idle.

    https://support.apple.com/en-gb/HT201918
     

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