From: steveo@eircom.net   
      
   On Thu, 14 Mar 2024 21:00:49 +1300   
   nospam.Vincent.Coen@f1.n250.z2.fidonet.org (Vincent Coen) wrote:   
      
   > Assuming it is fully charged which would be normal (assuming no outage in   
   > the preceding 2 - 3 hours 95% or better.   
   >   
   > Otherwise do you mean the estimated run time if so then system under   
   > power in watts per   
   > hour   
      
   	You have units confusion. Watt is a unit of power, a rate of   
   movement of energy. Watt-Hours and similar units are units of energy. Watts   
   per hour is meaningless.   
      
   > under the rated size - 25%  so lets say :   
      
   	Assuming you are talking about an APC SMT750I or similar they are   
   rated for a power output of 750VA or 500W. At full power the battery is   
   good for about five minutes.   
      
   > 750 w   
   > ----  = 150 = long time :)   
   > 5 w   
      
   	Make that 5 minutes * 500W/5W or 500 minutes which is indeed a long   
   time but a lot shorter than the 150 hours you were expecting.   
      
   > Also e.g., my desktop / server system with an estimated consumption of   
   > 250w (and it is lower as using modular PSU, 85% eff or better )  would be   
   > around 3 hours but that assumes there is nothing else under load and   
      
   	No it would be maybe 15 minutes.   
      
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