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Z-20 System

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johnd(at)data-tech.com
Guest

Posted: Mon Aug 13, 2007 11:51 am Post subject: Z-20 System

Hi All,



I'm getting ready for the electrical system in my zenith 601XL with a 

Jabiru 3300.



I'm trying to keep things simple and am thinking about going with the 

Z-20 Small Jabiru System. That diagram switches the main bus thru the 

Master switch instead of a battery contactor. Whats the practical cutoff 

in terms of current for using a contactor vs routing directly thru the 

switch. Any downside to adding a contactor to this plan ? Any upsides ?



Any issues with the Z-20 plan ?



Thanks,

John Davis

Burnsville, NC

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mosquito56

Joined: 24 Aug 2007
Posts: 77
Location: Laredo, Tx

Posted: Tue Nov 13, 2007 2:45 pm Post subject: Re: Z-20 System

I have just seen your post and I am also interested in the 601-Jab3300 z/20 diagram. I haven't seen any answers to your post but would like to know more about this diagram

Don

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_________________
Don Merritt- Laredo, Tx
.

nuckolls.bob(at)cox.net
Guest

Posted: Wed Nov 14, 2007 7:15 am Post subject: Z-20 System

At 03:45 PM 8/13/2007 -0400, you wrote:



 	  Quote: 	
		  



Hi All,



I'm getting ready for the electrical system in my zenith 601XL with a 

Jabiru 3300.



I'm trying to keep things simple and am thinking about going with the Z-20 

Small Jabiru System. That diagram switches the main bus thru the Master 

switch instead of a battery contactor. Whats the practical cutoff in terms 

of current for using a contactor vs routing directly thru the switch. Any 

downside to adding a contactor to this plan ? Any upsides ?



Any issues with the Z-20 plan ?


	


   The reason for NOT having a battery contactor in Z-20

   is to eliminate the energy lost keeping a battery

   contactor closed when that loss is a significant

   total of the alternator's output. Figure Z-17 is

   similarly devoid of battery contactor for the same

   reason.



   This architecture is appropriate to engines having

   PM alternators on the order of 10A or less  . . .

   which means bus loads of 10A or less. This architecure

   does not offer a secondary means for shutting the

   system down in case of a stuck starter contactor

   but these events are rare.



   If you want a battery contactor, wire per Z-16 but

   be sure to include battery contactor loads in your

   calculations for equipment you plan to install

   and your engine's ability to support those loads with

   what ever alternator is installed.



   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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nuckolls.bob(at)cox.net
Guest

Posted: Wed Nov 14, 2007 7:17 am Post subject: Z-20 System

At 02:45 PM 11/13/2007 -0800, you wrote:



 	  Quote: 	
		  

<mosquito-56(at)hotmail.com>



I have just seen your post and I am also interested in the 601-Jab3300 

z/20 diagram. I haven't seen any answers to your post but would like to 

know more about this diagram

Don


	


   P.S. I just looked up the 3300 and find that it's alternator

   is 15A continuous, 22A intermittent. Z-16 is the appropriate

   architecture for this engine.



   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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