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Lightening up Z12

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rvg8tor

Joined: 06 Apr 2009
Posts: 50
Location: Olympia, WA

Posted: Wed Apr 20, 2011 11:59 am Post subject: Lightening up Z12

I am going to ask this question a different way.  In Z12 there are 2 alternators, on plays a standby roll and will only produce power when the main alternator goes out or is turned off.  Given that only one alternator operates at a time only one ammeter would be needed to monitor the electrical load coming from the alternator providing the power.  



This reduces parts count; takes out a shunt and switch required to look at two shunts with on meter and or removes extra ammeter.



So does anyone see any flaws in this logic?



Cheers

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Mike "Nemo" Elliott
RV-8A QB (Engine)
www.mykitlog.com/rvg8tor

nuckolls.bob(at)aeroelect
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Posted: Wed Apr 20, 2011 4:57 pm Post subject: Lightening up Z12

At 03:59 PM 4/20/2011, you wrote:

 	  Quote: 	
		  



I am going to ask this question a different way.  In Z12 there are 2 

alternators, on plays a standby roll and will only produce power 

when the main alternator goes out or is turned off.  Given that only 

one alternator operates at a time only one ammeter would be needed 

to monitor the electrical load coming from the alternator providing 

the power.



This reduces parts count; takes out a shunt and switch required to 

look at two shunts with on meter and or removes extra ammeter.



So does anyone see any flaws in this logic?


	


  That will work



   Bob . . .

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rvg8tor

Joined: 06 Apr 2009
Posts: 50
Location: Olympia, WA

Posted: Fri Apr 22, 2011 10:50 am Post subject: Re: Lightening up Z12

Bob,



Since I would like to share one shunt, the shunt would have to come after the ANL for the main alternator and the fusible link for the standby alternator.  Is there any issue with the placement of the shunt before or after the wire protection?  Attached is a drawing of the proposal. The connection between the shunt and ANL will more than likely be copper bar stock.



You can see the standby B lead fusible link attaches to the shunt along with the B lead from the main alternator.



Also can you think of a failure mode in which the main alternator might be putting out a low amount of power that would still trip the 13V set point of the standby regulator?  I am trying to think if there is a failure mode in which both alternators would be putting out power.



Thanks for the help.

 	  nuckolls.bob(at)aeroelect wrote: 	
		  At 03:59 PM 4/20/2011, you wrote:

 	  Quote: 	
		  



I am going to ask this question a different way.  In Z12 there are 2 

alternators, on plays a standby roll and will only produce power 

when the main alternator goes out or is turned off.  Given that only 

one alternator operates at a time only one ammeter would be needed 

to monitor the electrical load coming from the alternator providing 

the power.



This reduces parts count; takes out a shunt and switch required to 

look at two shunts with on meter and or removes extra ammeter.



So does anyone see any flaws in this logic?



	


  That will work



   Bob . . .

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Electrical System - Power Distribution Shared Shunt.pdf

Description:

Z12 Modified

Download

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Electrical System - Power Distribution Shared Shunt.pdf

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188.36 KB

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_________________
Mike "Nemo" Elliott
RV-8A QB (Engine)
www.mykitlog.com/rvg8tor

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Apr 22, 2011 1:02 pm Post subject: Lightening up Z12

At 02:50 PM 4/22/2011, you wrote:

 	  Quote: 	
		  



Bob,



Since I would like to share one shunt, the shunt would have to come 

after the ANL for the main alternator and the fusible link for the 

standby alternator.  Is there any issue with the placement of the 

shunt before or after the wire protection?  Attached is a drawing of 

the proposal.



You can see the fuseable link attaches to the shunt along wiht the B 

lead from the main alternator


	


    What you show is fine.

   Bob . . .

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rvg8tor

Joined: 06 Apr 2009
Posts: 50
Location: Olympia, WA

Posted: Sat Apr 23, 2011 6:00 am Post subject: Re: Lightening up Z12

Thought I would follow up with a picture.  I decided to attach the standby alternator B lead on the downstream side of the ANL since it was more substantial than the screw on the shunt.  If the screws on the shunt were to work loose there is a tight enough fit that the copper bar should stay in place and provide some conductivity.  In the drawing in the second post of this thread, the standby B lead was attached at the shunt.



Ring on terminal on the left is the standby B lead and the main is on the right of the ANL.  Yellow fat wire goes through firewall to battery master relay (switched side), main bus feed is off the same side of the battery relay.



Cheers

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RV-8A QB (Engine)
www.mykitlog.com/rvg8tor

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