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Dual Battery Dual Alternator Power Distribution System

 
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nuckolls.bob(at)aeroelect
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PostPosted: Mon Nov 05, 2018 11:55 am    Post subject: Dual Battery Dual Alternator Power Distribution System Reply with quote

Quote:
Please help me to understand why using the redundant feeds might be a bad idea. Thanks.

Not necessary . . . already built in . . .

There is no bus in Z-14 at risk for
complete loss of power. Bizjets often offer
double or triple fed busses . . . the
Beechjet 400 had one. But the FMEA in that
airplane is a snarl of snakes.

I wrote a proposal once for splitting the
battery capacity into two separate devices
and doing a Z14-like architecture. Everyone
thought it would be a good thing . . . everyone
knew that the re-certification costs would be
breathtaking. Everyong knew that there was
no customer demand for the feature.

With the cross-feed capability, no single failure
will put any bus into a battery-only configuration . . .
much less total loss of power.



Bob . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Fri Nov 09, 2018 6:47 am    Post subject: Dual Battery Dual Alternator Power Distribution System Reply with quote

At 07:14 PM 11/8/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "lwesterlund" <lance.westerlund(at)yahoo.com>

Again, thanks for the detailed reply. Your approach certainly makes sense when using a conventional power bus. Afterall, what could possibly go wrong with a solid brass bus bar? It’s darn near bullet-proof.

As I asked in my reply to Bob’s response, what if you are using the VPX system? As robust as it is, it’s still not as failure proof as a solid hunk of metal. Even with dual power feeds, it becomes a single point of failure. Hence my proposed design.

Set the VPX system up per installation
instructions. Add second alternator/battery
with a cross-feed to the VPX system.

Make the aux bus your E-bus

This isolates the VPX system's FMEA
shortfalls (assuming there are any) from
E-bus while retaining the feature that
everything has 4-sources of energy
that can be exploited as needed.

No dual feeds, 'emergency' switches, complex
Plan-B, etc.

KISS



Bob . . .


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