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Question about Aux battery contactor on Z30

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nuckollsr(at)cox.net
Guest

Posted: Thu Jun 21, 2007 4:44 pm Post subject: Question about Aux battery contactor on Z30

At 03:56 PM 6/21/2007 -0600, you wrote:



 	  Quote: 	
		  Hi,



On drawing Z30 there is a auxiliary battery contactor. If the auxiliary 

battery is not being used for cracking the engine could this contactor be 

replaced with a diode similar to the endurance buss diode and still allow 

charging of the aux battery? The reasoning behind this question is it 

would lower the component count and simplify the isolation of the 

auxiliary battery.

Thanks,


	


   If the aux battery is never intended to drive the bus and

   only support its battery bus, then



   (1) a smaller power relay can be used like the S704-1

    automotive plastic relay which offers a voltage drop

    on hte order of tens of millivolts. See:



    http://tinyurl.com/2sno9m



   (2) Or you could use a power diode. Silicon junction

   devices have about .6 volts of drop in the conducting mode



     See http://www.vishay.com/docs/88612/gbpc12.pdf



   (3) a schottky device would bring this down to .4 volts.



     See http://www.vishay.com/docs/93275/9327520c.pdf

   Folks have found all three techniques useful.



   Bob . . .

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planesmith(at)hotmail.com
Guest

Posted: Thu Jun 21, 2007 6:54 pm Post subject: Question about Aux battery contactor on Z30

Bob,

  

 Thank you for the quick response and the multiply options. In building an airplane, so far,  the electrical is by far the most intriguing to me.

 Thanks again,

  

 Vern Smith

  

 do not archive



 	  Quote: 	
		   Date: Thu, 21 Jun 2007 19:41:52 -0600

 To: aeroelectric-list(at)matronics.com

 From: nuckollsr(at)cox.net

 Subject: Re: Question about Aux battery contactor on Z30

 

 --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>

 

 At 03:56 PM 6/21/2007 -0600, you wrote:

 

 >Hi,

 >

 >On drawing Z30 there is a auxiliary battery contactor. If the auxiliary 

 >battery is not being used for cracking the engine could this contactor be 

 >replaced with a diode similar to the endurance buss diode and still allow 

 >charging of the aux battery? The reasoning behind this question is it 

 >would lower the component count and simplify the isolation of the 

 >auxiliary battery.

 >Thanks,

 

 If the aux battery is never intended to drive the bus and

 only support its battery bus, then

 

 (1) a smaller power relay can be used like the S704-1

 automotive plastic relay which offers a voltage drop

 on hte order of tens of millivolts. See:

 

 http://tinyurl.com/2sno9m

 

 (2) Or you could use a power diode. Silicon junction

 devices have about .6 volts of drop in the conducting mode

 

 See http://www.vishay.com/docs/88612/gbpc12.pdf

 

 (3) a schottky device would bring this down to .4 volts.

 

 See http://www.vishay.com/docs/93275/9327520c.pdf

 

 

 Folks have found all three techniq========================> 

 

 


	


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