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Squeezing a battery

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ceengland7(at)gmail.com
Guest

Posted: Thu Jul 28, 2016 10:06 am Post subject: Squeezing a battery

On 7/28/2016 12:36 PM, Sebastien wrote:

 	  Quote: 	
		   I recently built a battery holder for an Odyssey PC545 battery to mount it on the firewall. Thought I had left a bit of wiggle room to get the battery in and out but now that it's bolted to the firewall it's in there tight. I don't mind having to remove 5 bolts every couple years to remove the battery (better than remaking the holder) but will it damage the battery to squeeze it? I don't think there is much if any pressure on the battery but it's already going to be stressed sitting in the heat in the engine compartment. Do these batteries need room to thermally expand at all?



 Thank you



 Sebastien

Is the clamping effect to the firewall itself (still some space moving 
	


battery side to side)? If so, you can shim the battery box out from the 

firewall with a washer or two under each mounting bolt.



Charlie

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cluros(at)gmail.com
Guest

Posted: Thu Jul 28, 2016 10:43 am Post subject: Squeezing a battery

I don't want to shim out with washers as I'm worried about stressing the firewall but I will make two full sized plates to shim out if I have to. A good point thank you. 

Sebastien

 	  Quote: 	
		   On Jul 28, 2016, at 11:07, Charlie England <ceengland7(at)gmail.com> wrote:

> On 7/28/2016 12:36 PM, Sebastien wrote:

> I recently built a battery holder for an Odyssey PC545 battery to mount it on the firewall. Thought I had left a bit of wiggle room to get the battery in and out but now that it's bolted to the firewall it's in there tight. I don't mind having to remove 5 bolts every couple years to remove the battery (better than remaking the holder) but will it damage the battery to squeeze it? I don't think there is much if any pressure on the battery but it's already going to be stressed sitting in the heat in the engine compartment. Do these batteries need room to thermally expand at all?

> 

> Thank you

> 

> Sebastien

 Is the clamping effect to the firewall itself (still some space moving battery side to side)? If so, you can shim the battery box out from the firewall with a washer or two under each mounting bolt.

 Charlie

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whd721

Joined: 01 Oct 2007
Posts: 15

Posted: Thu Jul 28, 2016 11:15 am Post subject: Squeezing a battery

It looks like somewhere between 10 to 30 washers could give you a snug fit as desired.





 	  Quote: 	
		   On Jul 28, 2016, at 10:56 AM, Sebastien <cluros(at)gmail.com> wrote:

 

 Attachment was too big. 

 

 <image1.JPG>

 

 Sebastien

 

> On Jul 28, 2016, at 10:36, Sebastien <cluros(at)gmail.com> wrote:

> 

> I recently built a battery holder for an Odyssey PC545 battery to mount it on the firewall. Thought I had left a bit of wiggle room to get the battery in and out but now that it's bolted to the firewall it's in there tight. I don't mind having to remove 5 bolts every couple years to remove the battery (better than remaking the holder) but will it damage the battery to squeeze it? I don't think there is much if any pressure on the battery but it's already going to be stressed sitting in the heat in the engine compartment. Do these batteries need room to thermally expand at all?

> 

> <image1.JPG>

> 

> 

> Thank you

> 

> Sebastien

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_________________
whd721
RV9A
Beaverton, OR

cluros(at)gmail.com
Guest

Posted: Sun Aug 07, 2016 6:13 pm Post subject: Squeezing a battery

Further along, in the EAC book Bob provides a procedure for testing the regulator in flight and suggests wiring the regulator sense directly to the battery if there is a difference between the battery voltage and the bus voltage. My voltage regulator in 12 inches from the battery which leads me to wonder:



Is there any reason NOT to have the regulator sense battery voltage directly at the battery? Any reason to have holes in the firewall to sense anywhere else?



Thank you. 



Sebastien



 	  Quote: 	
		   On Jul 28, 2016, at 10:36, Sebastien <cluros(at)gmail.com> wrote:

 

 I recently built a battery holder for an Odyssey PC545 battery to mount it on the firewall. Thought I had left a bit of wiggle room to get the battery in and out but now that it's bolted to the firewall it's in there tight. I don't mind having to remove 5 bolts every couple years to remove the battery (better than remaking the holder) but will it damage the battery to squeeze it? I don't think there is much if any pressure on the battery but it's already going to be stressed sitting in the heat in the engine compartment. Do these batteries need room to thermally expand at all?

 

 <image1.JPG>

 

 

 Thank you

 

 Sebastien

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Aug 07, 2016 6:29 pm Post subject: Squeezing a battery

At 09:12 PM 8/7/2016, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Sebastien <cluros(at)gmail.com>



 Further along, in the EAC book Bob provides a procedure for testing the regulator in flight and suggests wiring the regulator sense directly to the battery if there is a difference between the battery voltage and the bus voltage. My voltage regulator in 12 inches from the battery which leads me to wonder:



 Is there any reason NOT to have the regulator sense battery voltage directly at the battery? Any reason to have holes in the firewall to sense anywhere else? 	


   Yes . . . that lead may draw some small current

   that would discharge the battery of a parked airplane.

   Moving it to the battery is a TROUBLE SHOOTING 

   activity . . . not a suggestion for architecture.



   The properly fabricated system operates as

   advertised with the sense lead watching the

   main bus.



 

 

   Bob . . .

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