nuckolls.bob(at)cox.net
Guest
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 Posted: Mon Jan 07, 2008 7:49 pm Post subject: Shutdown reminder for switched loads on the battery bus |
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At 01:22 PM 1/7/2008 -0800, you wrote:
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FWIW I run two small 9AH batteries with Z-14. With an electrically
dependent engine running on a battery bus it is not overly difficult to
leave something running on a battery bus. My Low voltage warnings are not
active unless the EIS is powered off the main bus so it does not warn if a
light or battery bus item is left on. While it was definitely not a design
goal and I'm not recommending it - it is a benefit of Z-14 with equal size
batteries that either one of those little Dekka batteries will indeed
start the engine. Closing the x-feed relay will charge the other battery.
A little hard on the dead battery for sure but I've seen no evidence of
overheating or outgassing while doing the above. Mind you my largest
alternator is 40 amps and it puts out less than that on the ground and
even less when other loads are subtracted. Z-14 architecture has pleased
me with unexpected benefits a couple of times now.
A friend with a misbehaving electrical system would have really liked a
Z-14 recently when we were a long way from home or spare parts...
Ken
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One could install a low volts warning light to
watch switched, battery bus loads and drive the
warning from the downstream side of the control
switch. When the system is first powered up before
engine start, the light would come on and flash
if one or more battery bus loads is energized.
But as soon as the alternator picks up the bus,
the light would go out.
The same light would serve to remind the pilot
to shut down battery bus driven loads after the
engine is stopped or the alternator is shut down.
The circuit could be fitted with a cancel button
to stop the flashing in the event that an alternator
fails and the systems are now running battery only.
I can see how this might be accomplished with a
single lamp fixture with a built in PTT feature.
The lamp would annunciate the ON condition for
any battery bus supported load coincident with
low voltage. The PTT switch could be used to signal
the system to cancel flashing.
Bob . . .
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