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E-Bus Alt Feed wire size

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dbuds2

Joined: 07 Oct 2007
Posts: 2

Posted: Fri Apr 10, 2009 11:00 am Post subject: E-Bus Alt Feed wire size

RV8 with aft mounted battery and Z11 design. How much larger should the wire be from battery to "Always on Buss" and from "Always on Buss" to "E Bus Alternate Feed"? I estimate 20amp draw max from the E Bus.  



I've read about the Z32 Heavy Duty E bus Feed and would prefer to not have to do this. Even considering placing the battery on the firewall if I have to.

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Apr 12, 2009 6:19 pm Post subject: E-Bus Alt Feed wire size

At 02:00 PM 4/10/2009, you wrote:

 	  Quote: 	
		  



RV8 with aft mounted battery and Z11 design. How much larger should 

the wire be from battery to "Always on Buss" and from "Always on 

Buss" to "E Bus Alternate Feed"? I estimate 20amp draw max from the E Bus.


	


    You need to size it for 20A then. That would be a 12AWG

    wire.



 	  Quote: 	
		  I've read about the Z32 Heavy Duty E bus Feed and would prefer to 

not have to do this. Even considering placing the battery on the 

firewall if I have to.


	


    The recommendations for locating components,

    putting limits on lengths of always hot wire

    and limiting the energy that the wire can

    dump during a crash event are based on no

    particular science (i.e. no repeatable

    experiment). Therefore, the recommendations

    can be said to come from where the sun don't

    shine . . . but based on decades of anecdotal

    observation.



    If you wish to depart from those recommendations,

    it's your choice entirely.



    What's wrong with the e-bus alternate feed

    relay? It's backed up by the normal feed path.

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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dbuds2

Joined: 07 Oct 2007
Posts: 2

Posted: Tue Apr 14, 2009 5:17 pm Post subject: E-Bus Alt Feed wire size

Thanks Bob and for all your contributions to our experimental industry. 

There is nothing wrong with the e-buss relay, except it's more 

connections and another device. 



I think my confusion was caused by the standard z-15 schematic and how a 

7amp e-buss alt feed fuse can power the e-buss when the e-buss (as 

shown) could be much more than 7 amps.



-- 

Bud Smith

dbuds2(at)comcast.net

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Apr 14, 2009 6:28 pm Post subject: E-Bus Alt Feed wire size

At 08:16 PM 4/14/2009, you wrote:

 	  Quote: 	
		  



Thanks Bob and for all your contributions to our experimental 

industry. There is nothing wrong with the e-buss relay, except it's 

more connections and another device.

I think my confusion was caused by the standard z-15 schematic and 

how a 7amp e-buss alt feed fuse can power the e-buss when the e-buss 

(as shown) could be much more than 7 amps.


	


   The z-figures are intended to show architectures that

   can be tailored as to what alternators, regulators,

   batteries, starters, fuses/breakers, are appropriate

   to the task.



   The wire and fuse sizes are examples for the purpose

   of illustration . . . any and all can be adjusted

   to meet your unique requirements.

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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