On Fri, 23 Sep 2011 23:52:10 +0100, "Johny B Good"   
    wrote:   
      
   >On Fri, 23 Sep 2011 20:10:30 +0100,  wrote:   
   >   
   >> On Fri, 23 Sep 2011 08:06:35 -0400, "vaughn"   
   >>  wrote:   
   >>   
   >>>   
   >>> "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   
   >>>   
   >> Some UPS units will complain loudly about being fed by another one too   
   >> - some don't like squarewave input.   
   >   
   >  And, with good reason on account of the relatively large capacitive   
   >loading they may present on their mains input, although it's more likely   
   >that the cheap 'stepped' sinewave inverter driving into such a load will   
   >be the first to succumb.   
   >   
   >  As long as any such cheap UPSes (such as the BackUPS 500 and the Emmerson   
   >Accupower 30) are never used to feed another UPS and only true sine wave   
   >output UPSes (such as the Upsonic UPS600 and the APC SmartUPS 700 and 2000   
   >models), you'll be ok. As you may have gathered, I _was_ quite mindful of   
   >this issue. ;-)   
   >   
   >>   
   >> As for the power usage and the "kill-a-watts" units readings - I gort   
   >> a replacement for my EM100, and  swings between about 33 and 40 watts   
   >> with the occaisional spike to 70 - I'll run it for a period of time   
   >> and see what the average consumption comes out to. The old unit   
   >> indicated over 60 watts, my guess is less than 35 watts. This is a   
   >> TRUE ONLINE dual conversion UPS, so it will draw significantly more   
   >> than a standby unit.   
   >   
   >  If this is the type that uses its inverter full time to power the load   
   > from a float charged battery, that'll be exactly right!   
    That's the definitionof "dual conversion"   
   The new EM 100 registers .21 KwH over a period of 5.1 hours - which   
   translates to almost exactly 40 watts. The line reads 113 volts on the   
   new unit, and 116 on my old one.My LAB meter reads 115.6 volts - so   
   the new meter is going back.   
      
   It also indicates 0.69 amps, which at 113 volts would be 78 watts.   
      
   It is now on the "old" EM 100, which is more accurate voltage-wize,   
   according to my meter. It registers 0.72 amps at 116 volts - which   
   would be 83.5 watts. We will see what the KwH reading over time says.   
      
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