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Battery

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rnjcurtis(at)charter.net
Guest

Posted: Wed Nov 08, 2017 9:40 am Post subject: Battery

Bob,



I built the poor man's battery capacity tester and find that in checking it out it only takes the battery down to 11.7 volts and there seems to be a reasonable amount of power left in the battery. Is this the expected operation of this tester or do I have a problem with it?

Roger

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 08, 2017 10:26 am Post subject: Battery

At 11:40 AM 11/8/2017, you wrote:

  	  Quote: 	
		  Bob,



 I built the poor man's battery capacity tester and find that in checking it out it only takes the battery down to 11.7 volts and there seems to be a reasonable amount of power left in the battery. Is this the expected operation of this tester or do I have a problem with it?



 Roger 	




   Probably not. As you've discovered, this isn't a tightly

   'calibrated' device. You CAN lower the switch point

   by making small adjustment of the resistor in series

   with the zener. Lowering the resistance will lower the

   switch point.



   The primary value of what you have now is a REPEATABLE

   benchmark for tracking battery condition over its service

   life. Irrespective of the exact trip point, you can

   confidently assert that a battery that ran 2.7 hours

   when new and runs only 2.0 hours now has lost 26% of

   its capacity at the same load. 



 

 

   Bob . . .

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