From: martin_rid@verizon.net   
      
   "Jim Wilkins"  wrote in message   
   news:j5hubd$quv$1@dont-email.me...   
   >   
   > "vaughn"  wrote in message   
   > news:j5hso3$gfq$1@dont-email.me...   
   >>   
   >> "Johny B Good"  wrote in message   
   >> news:op.v18u4so9kd9x7s@fred...   
   >> ...>especially as it was supplying a second   
   >>> level of UPS protection from the protected mains sockets powered by   
   >>> my SmartUPS 2000 (a 2KVA 1500W unit) that I keep in the basement.   
   >>   
   >> This is a good point.  I learned the hard way that feeding one UPS   
   >> from another is a very bad idea.  Think of every UPS not only as   
   >> protection, but as a potential POINT OF FAILURE.  To reduce the   
   >> inevitable failures, simply reduce the number of UPSs.  I suffered   
   >> more than one unnecessary server outage before the lesson sunk in.   
   >> One layer of UPS "protection" is plenty!   
   >>   
   >> Vaughn   
   >   
   > What do you think of ganging them for occasional non-critical use,   
   > like recording an hour or two of television unattended? One UPS will   
   > power my recording PC for about 45 minutes. The wattage is somewhat   
   > less than half the UPS's rating, so it might survive a longer run with   
   > an external battery.   
   >   
   > jsw   
   >   
   Never put UPS's in series. Two or more powering separate devices is ok.   
   UPS's measure incoming freq and voltage of a AC line, usually   
   calculating the RMS of the line voltage.   
   Most UPS's are quasi sine output, so that screws up the calculations.   
      
   Cheers   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)