XPost: uk.rec.driving, alt.home.repair, uk.d-i-y   
   From: tnp@invalid.invalid   
      
   On 21/06/2019 22:57, 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.   
   >   
   Definitely. One of the simplest ways to msake a vcarger is to have a   
   constant voltage source in series with somem form of resistor. As the   
   terminal voltage rises so too does the charge current drop.   
      
   The problem that brings is when a heavy cirrent is siltanoeusly drawn   
   from the battery.   
      
   Which is why car alternator control is a little more spohisticated than   
   that.   
      
      
   --   
   “Some people like to travel by train because it combines the slowness of   
   a car with the cramped public exposure of 
an airplane.”   
      
   Dennis Miller   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)