Today's Message Index:
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1. 08:39 AM - Re: Z102 w/AEC9005 (Eric Page)
2. 08:11 PM - Re: Re: Z102 w/AEC9005 (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Z102 w/AEC9005 |
Trying again; I posted this ten days ago with no response...
> I'm building a Kitfox that will probably use an auto-based engine conversion.
I like the look of your Z102 architecture for its redundancy in engine electrical
supply, as well as the auxiliary bus for pre-flight ground activities. But,
I have a couple of questions:
>
> 1. Am I correct in my understanding that:
> a) the auxiliary battery is normally paralleled with the main battery during
engine start *and* during normal operation (bus voltage >13V) so that it can be
recharged by the alternator?
> b) the auxiliary battery will be isolated to engine-related functions only, if
the bus falls below 13V?
>
> 2. The Z102 schematic shows a START CMD signal from the push-to-start switch
to an AEC90XX Aux Battery Management Module (ABMM). The only thing like this that
I can find is your AEC9005 series of Low Voltage Warning and ABMM devices.
However, the AEC9005 schematic in this document...
>
> http://www.aeroelectric.com/DIY/LV_Warn_Fab_and_Install.pdf
>
> ...does not include an input for the START CMD signal. Is there another ABMM
design on the drawing board, or does Z102 contemplate an iteration of AEC9005
with the addition of the START CMD facility? If the latter, then is it safe to
assume that START CMD is simply a gate drive signal to the FET, diode isolated
from the comparator output?
>
> 3. On the AEC9005 schematic linked above, what is the purpose of Zener diode
Z118? Is it to protect the FET against excessive V(d-s) in case the contactor's
flyback diode fails to perform, or is missing?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498899#498899
Message 2
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| Subject: | Re: Z102 w/AEC9005 |
At 10:30 AM 10/19/2020, you wrote:
Trying again; I posted this ten days ago with no response...
Sorry 'bout that . . my bad.
I've been pondering the 'step up' from Z101 to
Z102 . . . not sure I'm all that enthusiastic
about it.
Help us understand the motivation for an
AUX battery added specifically to support
the engine.
Your total electrical needs for comfortable
flight are predictable and/or measurable.
The amount of energy contained in a battery
is similarly known.
If you split duties of the two batteries
for alternator-out operations, then your
endurance is set by whichever battery
gives up first.
Z101 offers dual feed bus structures with
opportunity for load shedding to a predictable
level. THAT number drives the battery
selection and maintenance protocol.
That's one of the reasons I discontinued the
IBMM . . . $cost of ownership$ for a second
battery is significant especially when it's
not a quantum boost to system reliability.
Bob . . .
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