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Battery strength

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Peter.Sokolowski(at)t-onl
Guest

Posted: Mon Jan 16, 2006 11:29 am Post subject: Battery strength

Hello all,

as I am new on this list - this is my first try to get some needed information.

So what I have is a 24 Volt system with a 12 Volt starter on an O360 F1A6. I was told that it should not be a problem to use the 12 Volt starter with 24 Volt as the voltage will drop anyhow to about 18 Volt and the starting process itself will not take more than 20 seconds which the starter should be capable to handle.

- what is the opinion of the group on this ?

- The second issue is that I need a figure of the battery strength (Ah) which is needed to start my engine. I know that this is depending on many issues and this should not be the only consideration for the strength but there must be a general idea of whether 17 Ah should do the job easily or should one go for 24 Ah or 7 Ah.

Thanks for your recomendations

Peter (Lancair 360 MKII, 85%)

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nuckollsr(at)cox.net
Guest

Posted: Tue Jan 17, 2006 8:11 am Post subject: Battery strength

At 07:25 PM 1/16/2006 +0000, you wrote:



 	  Quote: 	
		  



Hello all,

as I am new on this list - this is my first try to get some needed 

information.

So what I have is a 24 Volt system with a 12 Volt starter on an O360 F1A6. 

I was told that it should not be a problem to use the 12 Volt starter with 

24 Volt as the voltage will drop anyhow to about 18 Volt and the starting 

process itself will not take more than 20 seconds which the starter should 

be capable to handle.


	


  If it's a permanent magnet starter, it's probably not a good idea.

  The earliest automotive derivatives were series wound and fairly

  tolerant of short duration overloads . . . it will certainly crank

  the engine faster thus reducing total abuse time of the starter.



  What are your options? Take the starter off and replace it with

  an newer, lighter machine or run the existing starter 'til it

  croaks. Who knows, you may get considerable service life from

  the existing starter and the risks are low.



 	  Quote: 	
		  - what is the opinion of the group on this ?

- The second issue is that I need a figure of the battery strength (Ah) 

which is needed to start my engine. I know that this is depending on many 

issues and this should not be the only consideration for the strength but 

there must be a general idea of whether 17 Ah should do the job easily or 

should one go for 24 Ah or 7 Ah.


	


   Battery size is driven more by what your no-alternator

   endurance goals are. Have you conducted a load analysis

   for alternator-out operations and selected a minimum endurance

   time? See Chapter 17 of the 'Connection.



   Bob . . .

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Fred Stucklen

Joined: 10 Jan 2006
Posts: 10
Location: East Windsor, CT

Posted: Wed Jan 18, 2006 8:10 am Post subject: Battery strength

Bob,

 

  Another important issue might also be the speed at which the starter turns

the engine. Most impulse mags will not operate properly if the engine spins

too

fast. This was a typical issue with the C-152 after they went to a 24 Volt

system.



Fred Stucklen



RV-6A  N926RV

      

      

nuckollsr(at)cox.net <mailto:nuckollsr(at)cox.net> >

      

      At 07:25 PM 1/16/2006 +0000, you wrote:

      

      >

<mailto:Peter.Sokolowski(at)t-online.de> 

      >

      >Hello all,

      >as I am new on this list - this is my first try to get some needed 

      >information.

      >So what I have is a 24 Volt system with a 12 Volt starter on an O360

F1A6. 

      >I was told that it should not be a problem to use the 12 Volt starter

with 

      >24 Volt as the voltage will drop anyhow to about 18 Volt and the

starting 

      >process itself will not take more than 20 seconds which the starter

should 

      >be capable to handle.

      

        If it's a permanent magnet starter, it's probably not a good idea.

        The earliest automotive derivatives were series wound and fairly

        tolerant of short duration overloads . . . it will certainly crank

        the engine faster thus reducing total abuse time of the starter.

      

        What are your options? Take the starter off and replace it with

        an newer, lighter machine or run the existing starter 'til it

        croaks. Who knows, you may get considerable service life from

        the existing starter and the risks are low.

      

      >- what is the opinion of the group on this ?

      >- The second issue is that I need a figure of the battery strength

(Ah) 

      >which is needed to start my engine. I know that this is depending on

many 

      >issues and this should not be the only consideration for the strength

but 

      >there must be a general idea of whether 17 Ah should do the job

easily or 

      >should one go for 24 Ah or 7 Ah.

      

         Battery size is driven more by what your no-alternator

         endurance goals are. Have you conducted a load analysis

         for alternator-out operations and selected a minimum endurance

         time? See Chapter 17 of the 'Connection.

      

         Bob . . .

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nuckollsr(at)cox.net
Guest

Posted: Wed Jan 18, 2006 9:09 am Post subject: Battery strength

At 11:01 AM 1/18/2006 -0500, you wrote:



 	  Quote: 	
		  

<Fred.Stucklen(at)utcfuelcells.com>



Bob,



   Another important issue might also be the speed at which the starter turns

the engine. Most impulse mags will not operate properly if the engine spins

too

fast. This was a typical issue with the C-152 after they went to a 24 Volt

system.


	


   Hmmm . . . good point.  Peter, did you catch this?



   Bob  . . .





 	  Quote: 	
		  Fred Stucklen



RV-6A  N926RV



       

nuckollsr(at)cox.net <mailto:nuckollsr(at)cox.net> >



       At 07:25 PM 1/16/2006 +0000, you wrote:



       >

<mailto:Peter.Sokolowski(at)t-online.de>

       >

       >Hello all,

       >as I am new on this list - this is my first try to get some needed

       >information.

       >So what I have is a 24 Volt system with a 12 Volt starter on an O360

F1A6.

       >I was told that it should not be a problem to use the 12 Volt starter

with

       >24 Volt as the voltage will drop anyhow to about 18 Volt and the

starting

       >process itself will not take more than 20 seconds which the starter

should

       >be capable to handle.



         If it's a permanent magnet starter, it's probably not a good idea.

         The earliest automotive derivatives were series wound and fairly

         tolerant of short duration overloads . . . it will certainly crank

         the engine faster thus reducing total abuse time of the starter.



         What are your options? Take the starter off and replace it with

         an newer, lighter machine or run the existing starter 'til it

         croaks. Who knows, you may get considerable service life from

         the existing starter and the risks are low.



       >- what is the opinion of the group on this ?

       >- The second issue is that I need a figure of the battery strength

(Ah)

       >which is needed to start my engine. I know that this is depending on

many

       >issues and this should not be the only consideration for the strength

but

       >there must be a general idea of whether 17 Ah should do the job

easily or

       >should one go for 24 Ah or 7 Ah.



          Battery size is driven more by what your no-alternator

          endurance goals are. Have you conducted a load analysis

          for alternator-out operations and selected a minimum endurance

          time? See Chapter 17 of the 'Connection.



          Bob . . .



--




	




        Bob . . .

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it devine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

                   http://www.aeroelectric.com

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