[Nut-upsuser] New Cyber Power UPS

[Greg Troxel]

Mike via Nut-upsuser <nut-upsuser at alioth-lists.debian.net> writes:

> The new one is a Cyber Power CP1500AVRLCD3

Today I don't need a new UPS but I like to be ready.

Thus I have a few questions/comments, if you are inclined and of course
feel entirely free to not answer or to answer what you can without
effort.

  It looks like this has a UL 1776 approval:
    https://www.bhphotovideo.com/c/product/1751073-REG/cyberpower_cp1500avrlcd3_1500va_900w_line_interactive_lcd.html/specs
  Is that right?

  It is configured for 10 as battery.charge.low and 20 for warning.  I
  would be tempted to increase those to 20/40, depending on your real
  goals.  But I don't know how real they are anyway.

  I am most concerned about safety, reliability, and runtime at around
  100 VA, as I am thinking about router, switch and POE.  (For desktops,
  I'm ok with a plan of powering down once power has been out for a
  minute.)

  Your load value is 12, and I'm guessing that's 12% of 900 VA which is
  108 VA.

  It looks like this takes 2 batteries, 12V 9 Ah.  Do you think that's
  right?

  In theory that's 216 Wh as a 'not to exceed' value.  The specs about
  say 108 Vah (a typo for VAh, but that doesn't really make sense as VA
  is an AC concept).  Assuming 100 Wh usable from the battery (which I
  guessed before finding the above specs), and 75% efficiency (?), this
  should last maybe 45 minutes.  Specs claim 12 minutes at half load.
  The runtime shown by nut is 4750.  Lots of conflicting information.
  
  Have you put a power meter on your load (to read VA and W) to check
  the "12"?  Have you done a simulated failure test to obtaind the
  actual runtime, and even better to log the battery voltage and claimed
  runtime during the rundown?  This is a little rough on the batteries
  but my take is that if batteries aren't tested once a year, you really
  don't know if they are ok, and once a year testing isn't what kills
  them.

  It seems like the trend is to have more and more output power from the
  same 2 medium batteries.  (At work long ago I had an APC 1500 VA that
  had 2 12V 18Ah batteries.)   I wonder if the efficiency at 100 VA is
  as ok as it used to be.  To me "runtime at 100 VA" is the big thing,
  but the specs are price and max power/VA.
  
  Did you think about the sine-wave version CP1500PFCLCD?


Thanks,
Greg