I assume that the output of the A/C transformer and rectifiers in the Ten-Tec 
power supplies is 24 VDC and regulated down to 13.8VDC. Sounds like a lot of 
wasted energy in heat and stressed regulator components, but I have not looked 
at the schematic.
Rick
N4ASX
---- Roy Koeppe <royanjoy@ncn.net> wrote: 
> All you need for perfect regulation at 13.8 vdc is to connect two 12 v
> chevy batteries in series across the basic filter caps - via a 20 amp
> fuse - in a 961 or 962 power supply. The 24 v will be regulated down to
> 13.8 in exactly the same fashion as when you're running on ac power.
> (They must be chevy batts).
> 
> 73 & fun,    Roy     K6XK/0
> 
> 
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