From: muratlanne@gmail.com   
      
   "mike"  wrote in message   
   news:jpn0mf$sb0$1@dont-email.me...   
   > On 5/24/2012 6:42 PM, Jim Wilkins wrote:   
   >> ...   
   >> I'm not convinced that a KAW reads correctly on the output of a UPS   
   >> or   
   >> inverter.   
   > Ok, so who said to power it with an inverter?  Try sinewave outa the   
   > wall socket.   
      
   The KWH reading from a discharge test gives the remaining capacity of   
   the battery that powers the inverter, simply and safely.   
      
   I use a KAWez P4460 which retains the values after the inverter's low   
   voltage shutdown, and reads to 0.01 KWH or 10 Watt-Hours, so it has   
   enough resolution for small UPS batteries.   
      
   The indicated capacity of a new deep-discharge battery wan't much less   
   than what it should be, though it was discharged in six hours instead   
   of the 20 of its A-H rating.   
      
   I haven't finished the extra hardware and programming necessary to   
   read battery voltage and current with a laptop and datalogger. I have   
   a Radio Shack multimeter with an optically isolated serial port and a   
   serial port Dataq DI-194, both of which I can operate from DOS+QBasic   
   (unlike USB devices) on a laptop with 0~5V COM signal levels. Their   
   included Windows programs will run simultaneously but they log to   
   different files at different sampling rates.   
      
   Dataq's current lineup:   
   http://www.dataq.com/?source=googledq&gclid=CODez8y1kasCFesLtAodJS-Qtg   
   An isolated current sensor:   
   http://www.gmw.com/magnetic_sensors/ametes/CS.html   
      
   jsw   
      
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