Subj : Charger
To   : BEN RITCHEY
From : JEAN PARROT
Date : Wed Jun 08 2005 08:43 am

        Hello Ben, we were saying ! 

 BR> FYI, my research has discovered that Lead Acid cells need 1.085x

        2.085  of what base voltage, Ben ? When I had a sloop, I got quite
  involved in this aspect of keeping the battery banks charged up to keep
  foodstuf in the fridge. I installed a "computor" controller on the
  alternator to save engine run-time. The lead acid batteries can accept a
  higher voltage when they are low, it would get 14.7v to start and when
  the in-flowing amperage dropped, the voltage would also drop, they would
  be float-charged at 13.4v.

        Now, a 100% charge would be 12.66v after a drain of the top
   charge, 12.44v would be 50% residual wattage and 12.22 would be
   meaningless. Remember these figures...12.66  .44  .22 !

        So now, tell me what 1.085x ? With no useful capacity left, a
  digital voltmeter would still read 12.22v but there would be no energy
  left to mention. Amp/hour would linearly drop with the voltage, it would
  depend on the required load. A small fridge would need near 5 amp to
  start and run a close to 2.3 amps, it would not even start when the bank
  was down to < 12.3v ! These figures were derived from a normal good
  sized sloop, ocean going with +/- 4 crew.

        I am sorry, but I have no data for lithium cells.
     
 Hey, this nice Thinkpad is in 
  full use again.

  
  
 
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