[SEL] 32volt Delco light plant

[JR504 at aol.com]

In a message dated 7/31/2007 8:04:16 P.M. Eastern Daylight Time,  
rustaholic777 at yahoo.com writes:

That  page said to use two 12 Volt batteries and one 8 Volt battery to get 32 
 Volts.  I still haven't checked out the source mentioned to buy 8 Volt  
batteries though.



The problem with using two 12V + 8V (or 6V) batteries is that it is pretty  
much impossible to find batteries with the same internal resistance.  Same  
goes for using 3 different types of 12V batteries.  You are charging them  in 
series, so if the internal resistance is different the voltage drops  across them 
will all be different.  One battery can overcharge and one not  charge much 
at all.  Even though it might not sound like that's possible,  try measuring 
the voltage across each battery as the light plant is  running.  Let's say the 
light plant is charging 39V.  That's 13V  each.  If the batteries are different 
I've witnessed voltage drops from  10V-17V...one discharging (if it was 
charged) and one being overccharged.  
 
Also, as Arnie mentioned, any 3 identical 12V gadgets can be wired in  series 
and will run quite nicely on a light plant.  
 
Joe



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