1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Need a UPS but i have no clue where to start, what size? Are they silent? Please help

Discussion in 'Power Supplies' started by chickadee, Aug 21, 2018.

  1. chickadee

    Gangster

    Joined: Feb 14, 2015

    Posts: 391

    Location: Scotland

    So i have been getting weird problems where my pc will turn off like a powercut and i want to get a UPS to fix that. No i will have only the PC i have in my signature plugged in. Now this is where i dont really understand, i want the UPS to give my PC a nice clean supply of power but dont really care about how long it will last in a real power cut as i dont do anything critical on my pc. Would say a APC -BACK-UPS BX950U be ok for this? If not why?

    And most importantly i cant have a noisy unit, i need it to be silent and i see the spec sheet states 44db.....thats SERIOUSLY loud, surely it cant be that loud?
     
  2. Rroff

    Man of Honour

    Joined: Oct 13, 2006

    Posts: 56,829

    PSU will normally hold over minor spikes - anything big enough to cause it to restart would normally be noticeable as lights dim or flicker and/or other electronic devices exhibit problems. I'm not sure a UPS will solve your issue.

    If the PC is suddenly turning off completely in use then it is more likely the PSU is failing, faulty RAM or a bit less likely faulty CPU or GPU.
     
  3. chickadee

    Gangster

    Joined: Feb 14, 2015

    Posts: 391

    Location: Scotland

    Yes the lights do dim, its not common but it happens a few times a month i reckon, most things in the house are fine but my PC and the PC downstairs usually turns off so i was hoping a UPS would clean that up and stop it from being turned off.
     
  4. Rroff

    Man of Honour

    Joined: Oct 13, 2006

    Posts: 56,829

    You'd need a UPS that is rated for the kind of actual power draw the devices are consuming - it won't matter if the UPS can only manage a few minutes of power on time. That unit looks like it is rated for 480 watt so it would probably be a bit hit and miss with a reasonable spec gaming PC if you were in the middle of a demanding game, etc.

    Most UPS are generally pretty quiet - many of the BackUPS series are sealed units with no fan and aside from a little bit of faint hum/whistling when charging pretty much silent aside from the odd click when doing a self test and/or swapping over power. Some can have a noisier fan though often that is only used when the device is charging and/or temperatures rise to 40+C which they'd only hit on a warmer day.
     
  5. chickadee

    Gangster

    Joined: Feb 14, 2015

    Posts: 391

    Location: Scotland

    Ok here is where my lack of knowledge lets me down, so say i got the 480watt would that give my pc clean power? As in if the power went off for a split second would that not be noticed by the pc? I dont need it for when we have a full on powercut as those are so so rare but i get the blips every so often and i dont want my pc shutting down due to "bad power" as people call it.
     
  6. Pottsey

    Mobster

    Joined: May 29, 2006

    Posts: 3,511

    Sound level depends on the UPS. With my current UPS you cannot hear it while main power is on but the noise level goes up when there is a power cut and its working. That is acceptable to me.

    The other UPS I have and no longer use is so loud its around 44db even when mains is on.
     
  7. Rroff

    Man of Honour

    Joined: Oct 13, 2006

    Posts: 56,829

    If your PC was drawing under 480 watt than yes the PC shouldn't see any interruption of the supply and continue as normal - "clean" power is a bit of a complex one as many cheaper UPS actually don't do much proper filtering as such other than providing continuous power with many of them putting out a somewhat dirty modified square wave rather than a nicely cleaned up sine wave.

    EDIT: As an aside - I'm not sure how true it is but apparently a lot of PC monitors do NOT like the output from an average UPS even with the additional conversion and prolonged use driven from the UPS output (when it is running from battery) can destroy them.
     
  8. bremen1874

    Sgarrista

    Joined: Oct 20, 2008

    Posts: 8,699

    You'd need a pretty serious brownout to knock out a PC. The PSU is probably rated to work down to 100V.
     
  9. EsaT

    Mobster

    Joined: Jun 6, 2008

    Posts: 4,159

    Location: Finland

    Alarm for blackout/battery operation is no doubt louder than that in most UPSes.
    But for normal mains operation off-line/line-interactive UPSes don't have reasons to keep noise.
    Though some server/workstation grade line-interactive UPSes have always on fan.

    I guess you would like standard UK power socket to avoid needing different cables?

    APC Back-UPS has that closed plastic box insulating heat inside to cook crap capacitors of control electronics.
    So wouldn't recommend those.

    Cyberpower's such UPSes have some ventilation gaps:
    https://www.cyberpower.com/uk/en/product/series/Backup UPS Systems/BRICs LCD


    And just forget that VA rating used for marketing numbers.
    In AC world VA and W don't mean same thing, even if being equally big units.
    With power factor correction in PSUs, PC's don't have any real reactive power component, needing only watts.
    So of course marketing has again started hiding actual watt ratings deeper into specs and are pushing for VAs. (especially APC)

    I guess you're going to be keeping relatively high end gaming PC?
    (even if not updating parts constantly)
    In that case you'll want watt rating of UPS to be around 500W, so that it can handle transfer to battery during high loads.
     
  10. chickadee

    Gangster

    Joined: Feb 14, 2015

    Posts: 391

    Location: Scotland

    Thanks for the reply, so the one i was looking at was the APC BX950UI which is 480watts but you said they get hot? Is that only during times of battery usage? if so that wouldnt be a big issue for me but if its always then it could be. I cant find that UPS for sale anywhere but the few places it had a price its extremely expensive, i wasnt looking to spend THAT much since its not integral, its just a nice to have item.
     
  11. bremen1874

    Sgarrista

    Joined: Oct 20, 2008

    Posts: 8,699

    Qualify 'extremely expensive'.
     
  12. chickadee

    Gangster

    Joined: Feb 14, 2015

    Posts: 391

    Location: Scotland

    As in £200, i was looking at £60-£70 being a good price but i dont think i can justify spending £200 when i just spent over £1200 on a new pc unfortunatly
     
  13. Rroff

    Man of Honour

    Joined: Oct 13, 2006

    Posts: 56,829

    I've got a number of the tower style Back-UPS units in use and so far they've lasted fine though they do get warm especially if in an enclosed space during this warmer weather and that is all the time not just charging (technically they are always charging when not running off battery) or on battery.

    We've been through a few of the ones that are like an oversized power extension strip and they do not last very well - I'm guessing the path the heat takes through the chassis is a bit different between the units.
     
  14. EsaT

    Mobster

    Joined: Jun 6, 2008

    Posts: 4,159

    Location: Finland

    That one is tower model with slots for some airflow.
    But it has IEC sockets, so your normal power cords don't fit.
    Though you really need to get IEC power cord only for PC and monitor.
     
  15. EsaT

    Mobster

    Joined: Jun 6, 2008

    Posts: 4,159

    Location: Finland

    Those flat boxes are designed to fail with total lack of any airflow and garbage capacitors.
     
  16. chickadee

    Gangster

    Joined: Feb 14, 2015

    Posts: 391

    Location: Scotland

    It will only be used for my pc, nothing else, no monitor or any other equipment, do you think that model would be ok? the wattage is only 480 but i wonder if thats enough for my system (signature). You think that APC is a decent box for the price?
     
  17. EsaT

    Mobster

    Joined: Jun 6, 2008

    Posts: 4,159

    Location: Finland

    Not connecting monitor to UPS and inability to close programs and Windows in controlled way eats half the purpose of UPS.

    Actually checking from Geizhals.eu site Cyberpower's BR1000ELCD-UK (with UK power sockets) should be available for nearly same price level as that BX950UI.
     
  18. Paracelsus

    Hitman

    Joined: Jun 15, 2007

    Posts: 733

    Location: Manchester

    An APC Back-UPS kept my PS4 Pro and 4k TV going strong during about 600 power cuts (no exaggeration) while living in India for 6 months this year, would have brought it back but it weighs a ton..
    Also, it used to click a few times a minute or so in advance of a power cut when there was no outward sign of one, giving a handy warning!

    A few times there were almighty sand storms blowing outside in truly apocalyptic scenes, with power out for miles, while I'm on the couch in my boxers playing Dark Souls 3, thinking, if I'm going to die this isn't such a bad way...
     
  19. Phil2008

    Sgarrista

    Joined: Dec 17, 2004

    Posts: 7,514

    For those countries with hash weathers, a good idea is to have a beefy ups that is generator friendly.. Then run near enough everything through the ups in the house, or the important stuff. Then use a generator to power the ups during long powercuts. You then have constant safe power 24/7

    You just need to work out a easy way to to connect the ups to and from mains/generator power.
     
    Last edited: Aug 24, 2018
  20. chickadee

    Gangster

    Joined: Feb 14, 2015

    Posts: 391

    Location: Scotland

    I cant post the link but i seen a "Powercool Smart UPS 1200VAPowercool Smart UPS 1200VA" Which seems to be 700w, that seems plenty for my PC and nothing else, does anyone have any reason this would be a bad choice?