On Tue, 21 May 2013 15:20:17 -0700 (PDT), Bob Kuykendall
wrote:

On May 21, 2:32 pm, 2G wrote:

...My question is why do you think that you need a 14V
battery? All modern aviation electronics is...

My suspicion is that Steve has a collection of vintage avionics that
is not even in the same zip code as "modern," and that said devices
start crapping out at around 11 volts. With the 14v pack, you have
three volts of margin between nominal and nordo; with the 12v pack you
have only one volt of margin.

Quite so. Traditional avionics are designed to run on the 13.8V you
get from the voltage regulator in a "12 volt" system.

rj