nuckolls.bob(at)aeroelect
Guest
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 Posted: Thu Apr 09, 2009 7:51 am Post subject: AeroElectric Connection Fig. 17.6 Dual Battery Installatio |
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At 10:18 PM 4/8/2009, you wrote:
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Hello,
I am finalizing a single alt dual battery installation in my Lancair
360 and generally following the diagram in figure 17.6. According to
this diagram, with both the aux bat and main bat contactors open, the
aux battery is isolated from the endurance bus and essentially reduces
total endurance by half. Why not tie both batteries together to feed
the endurance bus through the E-Bus Alt Feed Switch? Not only do you
have both batteries working for you, but the current drain from the
aux bat contactor is eliminated.
I'm definitely electrically challenged so what am I missing here?
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The idea behind Figure 17-6 is to provide separate energy
sources for running (1) and electrically dependent engine
and (2) running endurance loads during alternator-out
operations. This architecture is described in more detail
in Figure Z-19 and was conceived to support engines that
had no practical way to run two alternators. This generally
means certain automotive conversions.
During alternator out operations, it was a DESIGN GOAL
to assign separate tasks to the two batteries as described
in the chapter 17 and Appendix Z texts for these figures.
Your engine is very capable of supporting two alternators.
Further, you don't say whether or not your engine is
electrically dependent (other than pumping of fuel).
There are architectures much more suited to your project
namely Z-13/8, Z-12 or (if you're going all out for
full up IFR flight capability from either pilot's
position) Z-14.
I'll suggest you consider Z-13/8 and figure out how
' (or if) it fails to meet your operational design goals.
This configuration is the lightest, least expensive
and most user friendly to have system reliability
that exceeds the vast majority of type certificated
piston engine airplanes flying.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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