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Dan -
A question for you (and anyone else who would like to contribute) is how
much time should backup electrical power be capable of? One could choose many criteria and scenerios. If you have a split
vacuum/electric system (or an all electric system) and primary electrical
power fails, you would not want to hastily land in "timbucktwo", but would
most likely continue flying to your destination (or an airport capable of
repairs), possibly as long as two or three hours. I didn't mention yesterday that a radio draws very little current in the
receive mode and could well be connected to the backup system. Garmin states
that my GPS 150XL has a built-in battery with four hours capacity. My
estimate of 30 A-H might be too liberal and my previous 12 A-H Concorde
might be sufficient for my two to three hour criteria.
Bill Rumburg
N403WR  (Sonic bOOm)

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