From: muratlanne@gmail.com   
      
   "mike"  wrote in message   
   news:jpmltk$cnc$1@dont-email.me...   
   > On 5/24/2012 3:47 PM, Jim Wilkins wrote:   
   >> ...   
   >> If you are on a home-experimenter budget with old surplus   
   >> equipment,   
   >> accurate AC power measurement is quite a challenge.   
   >   
   > My point is that it IS NOT difficult at all.   
   > IN the US, there's a wattmeter at the utility entrance.   
   > OR   
   > A $20 KillAWatt meter will do pretty well for AC powered stuff.   
   > You can measure output power with a resistor, thermometer, stopwatch   
   > and a pound of water.   
      
   I'm not convinced that a KAW reads correctly on the output of a UPS or   
   inverter.   
      
   My utility meter records 7.2 Watt-Hours per disk rotation. It's the   
   value stamped in the 'Kh" box.   
      
   jsw   
      
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