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Dual Battery design

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haribole

Joined: 21 Feb 2014
Posts: 33
Location: United States

Posted: Thu Jan 19, 2017 9:59 am Post subject: Dual Battery design

I was originally planning on using the Z19B, but came across a print out of what looks like a much simpler dual batter design. Not sure where I printed this from, but this surely looks like an aeroelectric design and can not find this in the 12th edition book.

could someone please see if they recognize this and enlighten me?

Thanks

Hari

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haribole

Joined: 21 Feb 2014
Posts: 33
Location: United States

Posted: Thu Jan 19, 2017 10:39 am Post subject: Dual Battery design

Forgot the attachment.

On Thu, Jan 19, 2017 at 9:55 AM, Hariharan Gopalan <rdu.hari(at)gmail.com (rdu.hari(at)gmail.com)> wrote:

 	  Quote: 	
		  I was originally planning on using the Z19B, but came across a print out of what looks like a much simpler dual batter design. Not sure where I printed this from, but this surely looks like an aeroelectric design and can not find this in the 12th edition book.

could someone please see if they recognize this and enlighten me?

Thanks

Hari

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Doc_-_Jan_19_2017_-_12-43_PM.pdf

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user9253

Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan

Posted: Thu Jan 19, 2017 7:44 pm Post subject: Re: Dual Battery design

That is not one of Bob N's schematics.  It has some major flaws.

The starter current goes through the ammeter shunt.

The E-bus relay coil appears to be always grounded but is not.

The 4 pole switch is a single failure point.

The 20 amp circuit breaker for the starter contactor and solenoid seems too big.

The 200 amp ANL alternator current limiter seems way too big.

The 200 amp ANL battery current limiters are unnecessary and should not be in series with starter motor.

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jan 20, 2017 6:03 am Post subject: Dual Battery design

At 12:36 PM 1/19/2017, you wrote:

  	  Quote: 	
		  Forgot the attachment.



 On Thu, Jan 19, 2017 at 9:55 AM, Hariharan Gopalan <rdu.hari(at)gmail.com (rdu.hari(at)gmail.com)> wrote:

   I was originally planning on using the Z19B, but came across a print out of what looks like a much simpler dual batter design. Not sure where I printed this from, but this surely looks like an aeroelectric design and can not find this in the 12th edition book.



  could someone please see if they recognize this and enlighten me?

  	


   That drawing uses symbols from my library

   and suggests a strong influence from

   AEC architecture drawings . . . but it

   is not my drawing. It also deviates from

   recommended practices in several regards.



 

 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jan 20, 2017 6:05 am Post subject: Dual Battery design

At 12:36 PM 1/19/2017, you wrote:

  	  Quote: 	
		  Forgot the attachment.



 On Thu, Jan 19, 2017 at 9:55 AM, Hariharan Gopalan <rdu.hari(at)gmail.com (rdu.hari(at)gmail.com)> wrote:  I was originally planning on using the Z19B, but came across a print out of what looks like a much simpler dual batter design. Not sure where I printed this from, but this surely looks like an aeroelectric design and can not find this in the 12th edition book.

  could someone please see if they recognize this and enlighten me? 	
 

   That drawing uses symbols from my library

   and suggests a strong influence from

   AEC architecture drawings . . . but it

   is not my drawing. It also deviates from

   recommended practices in several regards.



 

 

   Bob . . .

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haribole

Joined: 21 Feb 2014
Posts: 33
Location: United States

Posted: Fri Jan 20, 2017 1:42 pm Post subject: Re: Dual Battery design

Thanks Bob.  I remember reading sometime back about a proposed alternative to the Z-19 dual battery design. Is there one that has still not been published in the book?



Thanks

Hari

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Jan 21, 2017 5:18 am Post subject: Dual Battery design

At 03:42 PM 1/20/2017, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "haribole" <rdu.hari(at)gmail.com>



 Thanks Bob.  I remember reading sometime back about a proposed alternative to the Z-19 dual battery design. Is there one that has still not been published in the book? 	


   Let's back up a bit. What is it about Z-19 that

   makes it attractive to your project? Keep

   in mind that the z-figures are not 'wire books'.

   They do not propose to SPECIFY sizes of wires,

   size/style of protection, size or type of battery(ies),

   size of alternators, style of switches, etc.



   They are illustrations that suggest architectures

   that strive for the elegant solution to meeting

   design goals that FIT your machine/mission profiles.

   M/MP. Z-14 MIGHT make sense for a Lancair IVP, but

   Z-13/8 could very well accomplish the builder's

   M/MP.



   The Z-figures do indeed show some SIZED protective

   devices and similarly sized wires . . . but EVERY

   component you choose to install should be verified

   for suitability to task and evaluated for how it

   fits into your failure mode effects analysis.



   How can it fail? How would I know it failed in

   flight? Would failure present an unacceptable

   level of risk to comfortable termination of

   flight? Is the failure pre-flight detectable?

   What is my Plan-B for making such failures

   a simple maintenance issue as opposed to an

   emergency?



   So tell us about your project. How to do plan

   to use it? In your cruise down the isles of

   simple ideas in the 'Connection, what features

   offered seem a best-fit for design goals based

   on your M/MP?



   The  Dual battery concepts were crafted in response

   to the rise in interest for using electrically dependent

   engines in aircraft. HOWEVER, having an electrically

   dependent engine does not necessarily dictate that

   two batteries are the best choice. 



   Let's talk about it . . .



 

 

   Bob . . .

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