XPost: uk.rec.driving, alt.home.repair, uk.d-i-y   
   From: CFKinsey@military.org.jp   
      
   On Fri, 21 Jun 2019 23:57:52 +0100, Rod Speed  wrote:   
      
   >   
   >   
   > "Commander Kinsey"  wrote in message   
   > news:op.z3q9fvpjwdg98l@desktop-ga2mpl8.lan...   
   >> 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 the way batterys work, the battery voltage does change as its   
   > charged.   
   >   
   >> That's determined by the alternator or charger.   
   >   
   > Nope.   
      
   Yip.  I can put any voltage I like across a battery's terminals.  The battery   
   then chooses how much current is drawn.   
      
   >> 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.   
   >   
   > Its more complicated than that with the current going to the battery and the   
   > battery is charged.   
   >   
   >> 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.   
   >   
   > No it doesn't even with a very crude battery charger.   
      
   For example, I'm currently keeping my car's battery topped up with a bench   
   supply overnight.  It's set to 13.8V, with a current limiter only to prevent   
   overloading the supply.  The voltage stays at 13.8V all the time, sometimes   
   100mA is drawn, sometimes    
   up to 4A.  The only way I or the supply can tell the battery is full, is by   
   the current dropping to 100mA.  But it's actually always full, as when 4A is   
   drawn, that's going to a load.   
      
   >> 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?   
   >   
   > By checking the current actually being delivered to the battery.   
      
   I guess that may be true, if the car's computer has two ammeters and subtracts   
   one from the other.   But AFAIK, the alternator regulator only works by it's   
   own current sensor.  And that current could be going into the battery, or past   
   it to the loads.   
      
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