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Figure Z-10/8 compared to Z-11 + Aux Battery and Diode Bri

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N509RV(at)eckenroth.com
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Posted: Tue Feb 17, 2009 2:57 pm Post subject: Figure Z-10/8 compared to Z-11 + Aux Battery and Diode Bri

Floyd



My aux battery is used through the E Buss.  The idea being that it would add to the endurance in addition to keeping the EFIS alive during engine start. This was based on diodes keeping the two batteries segregated.  I could go directly to the EFIS but would then have to add a switch.  

 

Paul



On Tue, Feb 17, 2009 at 4:47 PM, Floyd <fwilkes(at)gvtc.com (fwilkes(at)gvtc.com)> wrote:

[quote]          Paul,

  

 Do you have the aux battery connected to the  connected to the "external backup power" on pin 15 or just to the keep alive on  pin 2.  When I only had one battery, I would get the brown out you  mention.  When I added the aux battery connected to pin 15, my problems  went away.

  

 Floyd Wilkes

 601XL

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floyd wilkes

Joined: 11 Jun 2007
Posts: 39
Location: spring branch, tx

Posted: Tue Feb 17, 2009 4:43 pm Post subject: Figure Z-10/8 compared to Z-11 + Aux Battery and Diode Bri

Paul,

  

 The diodes cause at least a .5 volt drop not the  best idea if you are trying to use the last bit of battery.

  

 With the pin 15 connected to the aux battery  directly via a fuse, the dynon will automatically switch to the aux if  voltage drops on the primary.  It will then display a message that it  will shut down in 30 seconds if you do not press a button to cancel  the shut down.  Thus no switch is required as it automatically turns off 30  seconds after you lose power from the primary unless you cancel the  shutdown.

  

 That is how I have mine wired.  So on every  shutdown I get the message the dynon will shutdown in 30 seconds.  I let it  timeout and that is that. 

  

 Floyd Wilkes

 601XL

  

 Do not archive

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_________________
Floyd Wilkes

N509RV(at)eckenroth.com
Guest

Posted: Wed Feb 18, 2009 11:21 am Post subject: Figure Z-10/8 compared to Z-11 + Aux Battery and Diode Bri

Bob and all who responded



The diodes were tested using the multimeter and also using the 12V battery.  Everything functions as it should.  No voltage is detected on the terminals that should be blocked.  Also when using the E switch to llight the E Buss the Main Buss stays dark.  I have removed leads and started and flown with the aux battery only powering the E Buss without issues.  Unless someone has any other ideas I believe I will rewire so that the aux battery directly powers the E buss during start eliminating a diode at that point.

 

I am very curious as to the assertion of my EE friend that two diodes powering the same buss from two different power sources (batteries) can reverse direction (backfeed) if the anode voltage is less than the cathode which would possiblly explain my problem.  Can anyone specifically address this.

 

Also, when I adjust my wiring I intend to feed both batteries through the bridge diode and through the E Buss switch.  I am assuming that both batteries and the diode voltage drop is better than the main battery only without the diode voltage drop for endurance.  I would be interested in other opinions.

 

Thanks for all the comments.



Paul



On Wed, Feb 18, 2009 at 12:38 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

 [quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>

  



 At 11:21 AM 2/18/2009, you wrote:

  	  Quote: 	
		   Paul,

 I have tested diodes at work that check out fine with a voltmeter but fail under load.  I think the reason is that the voltmeter is testing the diode with 1.5 volts, whereas the actual circuit operates at a much higher voltage.  So using a voltmeter is not a good test.  Here is a test you can try: Disconnect the main battery to eliminate any possibility that it is affecting your tests.  Connect one lead of a 12 volt test light to the aux battery negative or ground.  With the other lead, touch each terminal of the diode.  The light should illuminate on the battery side of the diode but not on the other side.  The fact that you are using two diodes should not cause the symptoms that you describe.

  Joe Gores

 	
 



    I'd be pleased to put my hands on any diode

    that exhibits any failure mode. I'll pay $5 plus

    postage for any carcass you can send me.

 

 

        Bob . . .

 

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