XPost: uk.rec.driving, alt.home.repair, uk.d-i-y   
   From: CFKinsey@military.org.jp   
      
   On Fri, 21 Jun 2019 22:57:44 +0100, Max Demian  wrote:   
      
   > On 21/06/2019 21:19, Commander Kinsey wrote:   
   >> How does a lead acid battery charger (or car alternator) know when to   
   >> switch to trickle charge?  I can understand it noticing a drop in   
   >> charging current if the battery is on its own, but what if a random   
   >> changing load is connected, as there is in a running car?   
   >   
   > The voltage perhaps.   
      
   Why would the voltage change?  That's determined by the alternator or   
   charger.  Let's say the charger/alternator gives out 14.4V initially, to   
   charge the battery quickly.  It'll just sit at 14.4V forever, providing the   
   charger can give out enough current    
   to charge the slightly flat battery and power any connected loads.  If the   
   battery had no loads connected, it would take a lot less current when it   
   became full, but the voltage would stay the same.  If the charger monitored   
   the current it was providing,    
   how does it know if the battery is still charging at 10 amps, or if the   
   battery is full and there's a 10 amp load?   
      
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