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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 1:51 pm Post subject: Dual Battery Dual Alternator Power Distribution System

At 02:41 PM 11/5/2018, you wrote:

  	  Quote: 	
		  Bob,



 Thank you for making that point clear about no bus at risk for complete loss of power in the Z-14 design.  I am no expert on the electrical systems and won't even claim a novice status but I do claim to be very logical and I could not see a total failure situation in the Z-14 as long as you had a cross feed engaged and you have not lost everything.  That is the reason that I decided to go with the Z-14 for my plane and I don't think I will be disappointed.  The reality is that it was not that difficult to understand or incorporate.  Besides I like having the extra battery power for starting. 	


   Keep in mind that normal ops are with the cross-feed

   feature OPEN. This avoids having one alternator shut

   down without a low-voltage annunciation.



   Every bus (other than battery busses) has FOUR

   sources of energy available for mitigation of

   any single failure event.



   It was the designer's mis-application of

   "multiple feed busses" that set up a recipe

   for failure in the N811HB accident

   in California. That accident was a particular

   disappointment . . . the builder attended

   one of my seminars and had a copy of the book.

   Neither he nor his professional assistant were

   members of the List. Preventing the circumstance

   that primed that accident was stone simple.



   The 4th video on this page illustrates the

   advantage powering the dual ignition system

   from independent Z14 batteries



  https://tinyurl.com/msfmldj



   



 

 

   Bob . . .

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lwesterlund

Joined: 02 Nov 2018
Posts: 4
Location: Beaverton, OR

Posted: Mon Nov 05, 2018 3:10 pm Post subject: Re: Dual Battery Dual Alternator Power Distribution Sys

Bob,  



Thanks for the quick reply and the video. 



I’d be curious to know what you recommend regarding an architecture that incorporates the Vertical Power system (or something like it) and p-mag ignitions.



Assuming you use the VPX as the main power distribution bus in Z-14, doesn’t it essentially become a potential single point of failure for all loads on that bus? I understand that the Pro version has two controllers and two internal buses, but if the entire box went up in smoke, or had to be pulled, it would kill everything downstream; the two batteries and the two alternators could no longer connect to the loads even with the cross connect capability.



What I penciled out was a way to take advantage of the VPX and dual feed avionics to allow you to still get power to all flight critical components. Kill any component, including the VPX, and you still have at least one alternator and one battery on-line.



It seems like a reasonable way to leverage the robust nature of the Z-14 design while availing oneself of the newest technology that allows one to monitor and control power real time. So back to the original question-what’s the best way to integrate the VPX into a dual bat/ dual alt system? 

Lance

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