Well... That was another option among others but how many people know what
Zener diodes are??? Actually you don't need a resistor at all if you attach
the one end to 28V and the other to the load (better get it correct or you
get 27.3V to your load though !!!)
If I was going to make my own I would use a 3 terminal regulator with
appropriate current amp if need be. But then if a device is procurable
readily then that is the answer.
>... Differential drain? Not really a factor in a 48 amp-hour battery that
is >designed to produce on the order of 650 cold cranking amps. Charging is
applied >to the battery cells that need it most (which is related to why a
dead/shorted >cell results in "cooking" the rest of the cells)
Not so sure about that. If you shunt current around the bottom battery the
upper battery gets more charge current than it needs which is OK I suppose
if you keep an eye on the acid level. But to be realistic, if your talking
about a small load like a radio etc., batteries don't last that long anyway
in the big scheme of things.
je
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