Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Battery strength

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List
View previous topic :: View next topic  
Author Message
Peter.Sokolowski(at)t-onl
Guest





PostPosted: Mon Jan 16, 2006 11:29 am    Post subject: Battery strength Reply with 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.
- 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%)


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
nuckollsr(at)cox.net
Guest





PostPosted: Tue Jan 17, 2006 8:11 am    Post subject: Battery strength Reply with quote

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 . . .


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
Fred Stucklen



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

PostPosted: Wed Jan 18, 2006 8:10 am    Post subject: Battery strength Reply with quote

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 . . .


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
View user's profile Send private message
nuckollsr(at)cox.net
Guest





PostPosted: Wed Jan 18, 2006 9:09 am    Post subject: Battery strength Reply with quote

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


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group