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Battery busses in a fiberglass airframe

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Thu Oct 17, 2013 12:06 pm Post subject: Battery busses in a fiberglass airframe

All,



For weight and balance reasons, my battery-(ies) will be in the tailcone of my Europa fiberglass airframe which includes a non-metallic firewall.



Battery ground wires will run forward to ground on the engine.



With an EFI'ed engine, I will have battery busses to carry all circuits essential to keeping the engine running (fuel pumps, ECU, fuel injectors, and coils). 



For convenience and accessibility, I want those busses forward...on the engine side of the firewall. On a related matter, I would prefer the battery contactors to be located on the engine side of the firewall.



I understand that customary practice is to keep the contactors adjacent to the batteries, and to minimize the length of "hot" wires connected directly to the batteries.



What I'm wondering is whether or not having a non-conductive airframe sufficiently mitigates the risks which customary practice is intended to minimize...?...



Is there anyone out there who is flying a fiberglass airplane w/ rear mounted battery and dealt with these issues?



..all comments appreciated...



Fred

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nuckolls.bob(at)aeroelect
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Posted: Thu Oct 17, 2013 12:49 pm Post subject: Battery busses in a fiberglass airframe

At 03:04 PM 10/17/2013, you wrote:

 	  Quote: 	
		  



All,



For weight and balance reasons, my battery-(ies) will be in the 

tailcone of my Europa fiberglass airframe which includes a 

non-metallic firewall.



Battery ground wires will run forward to ground on the engine.


	


    You can do this on one ground wire (between a battery(-)

    common point for both batteries in tail) and a

    recommended ground block on the firewall.

 	  Quote: 	
		  With an EFI'ed engine, I will have battery busses to carry all 

circuits essential to keeping the engine running (fuel pumps, ECU, 

fuel injectors, and coils).



For convenience and accessibility, I want those busses forward...on 

the engine side of the firewall. On a related matter, I would prefer 

the battery contactors to be located on the engine side of the firewall.


	


    After studying your engine description I don't

    think these 'engine busses' are going to be all

    that complicated. I'm 10 minutes from hitting the

    road for Wichita . . . I'll elaborate more Saturday

    when I get back.



 	  Quote: 	
		  I understand that customary practice is to keep the contactors 

adjacent to the batteries, and to minimize the length of "hot" wires 

connected directly to the batteries.


	


     Yes.



 	  Quote: 	
		  What I'm wondering is whether or not having a non-conductive 

airframe sufficiently mitigates the risks which customary practice 

is intended to minimize...?...



Is there anyone out there who is flying a fiberglass airplane w/ 

rear mounted battery and dealt with these issues?


	


     Depends on what you mean by "dealt with these issues".

     What are the perceived gains for moving the contactors?



   Bob . . .

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