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Dual Battery Dual Alternator Power Distribution System

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

 	  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
Guest

Posted: Fri Nov 09, 2018 6:47 am Post subject: Dual Battery Dual Alternator Power Distribution System

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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