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Battery insulation

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Leo Holler

Joined: 29 Mar 2007
Posts: 7

Posted: Sat Apr 14, 2007 12:16 pm Post subject: Battery insulation

A friend has a Cherokee 140 with an original battery box beneath the rear seat. He has replaced the lead acid battery with a 16 AH RG battery. The RG battery is oriented the same as the lead acid battery had been. To keep the new battery from flopping around (it is much smaller than the old lead acid one) he inserted DOW HI (blue board foam) insulation around the four sides. I don't recall seeing any insulation under or over the battery. My question: Is this insulation OK or is there a chance that the battery could overheat if under heavy recharge? The installation looks nice and tidy and is very lightweight, but I'd like to make sure he is not set up for a problem in flight. Please comment if you can.



Leo Holler

leoh(at)gci.net

BobsV35B(at)aol.com
Guest

Posted: Sat Apr 14, 2007 12:38 pm Post subject: Battery insulation

Good Afternoon Leo,   

 Is the RG battery he is using in his Cherokee listed as being approved for  that use?

  

 Happy  Skies,



Old Bob

AKA

Bob Siegfried

Ancient Aviator

Stearman  N3977A

Brookeridge Air Park LL22

Downers Grove, IL 60516

630  985-8503



  

 In a message dated 4/14/2007 3:20:30 P.M. Central Daylight Time,  leoh(at)gci.net writes:

  	  Quote: 	
		  A friend    has a Cherokee 140 with an original battery box beneath the rear seat. He has    replaced the lead acid battery with a 16 AH RG battery. The RG battery is    oriented the same as the lead acid battery had been. To keep the new battery    from flopping around (it is much smaller than the old lead acid one) he    inserted DOW HI (blue board foam) insulation around the four sides. I don't    recall seeing any insulation under or over the battery. My question: Is this    insulation OK or is there a chance that the battery could overheat if under    heavy recharge? The installation looks nice and tidy and is very lightweight,    but I'd like to make sure he is not set up for a problem in flight. Please    comment if you can.



Leo Holler

	


 





See what's free at AOL.com. 

  [quote][b]

Leo Holler

Joined: 29 Mar 2007
Posts: 7

Posted: Sat Apr 14, 2007 5:10 pm Post subject: Re: Battery insulation

 	  BobsV35B(at)aol.com wrote: 	
		  Good Afternoon Leo,   

 Is the RG battery he is using in his Cherokee listed as being approved for  that use?

  

 Happy  Skies,



Old Bob

AKA

Bob Siegfried

Ancient Aviator

Stearman  N3977A

Brookeridge Air Park LL22

Downers Grove, IL 60516

630  985-8503 	




  

 Bob,



The battery is not approved for the Cherokee but is FAA PMA'd and approved for many others I'm told. They will need a 337 to finish the install per his AI.



Leo

 





See what's free at AOL.com. 

   	  Quote: 	
		  [b] 	
 	  Quote:

BobsV35B(at)aol.com
Guest

Posted: Sat Apr 14, 2007 6:06 pm Post subject: Battery insulation

In a message dated 4/14/2007 8:13:28 P.M. Central Daylight Time,  leoh(at)gci.net writes:

  	  Quote: 	
		  Bob,



The battery is not approved for the Cherokee but is FAA    PMA' d and approved for many others I'm told. They will need a 337 to finish    the install per his AI.



Leo

	


 

Thank You Leo,

  

 In the event something leaks, has anyone yet investigated the suitability  of the foam when it gets involved with corrosive gases? May not be considered a  problem, but --- ??

  

 Happy  Skies,



Old Bob

AKA

Bob Siegfried

Ancient Aviator

Stearman  N3977A

Brookeridge Air Park LL22

Downers Grove, IL 60516

630  985-8503



See what's free at AOL.com. 

  [quote][b]

jim jewell

Joined: 09 Jan 2006
Posts: 82
Location: Kelowna B.C. Canada

Posted: Sat Apr 14, 2007 6:37 pm Post subject: Battery insulation

Leo,



Without regard to FAA regs etc;



Just a guess, I doubt there should be a problem with the battery box stuffed 

as described.



If you used a hole saw to punch the foam full of holes the insulating 

quality of the foam would be reduced somewhat.

Also the drilled foam would be less resistant to being crushed and therefore 

move out of the way reducing the chance of structural damage should the 

"overheating" or dying battery begin to expand.

Who knows what would become of the battery in a crash scenario?

Jim in Kelowna





---

_________________
"I never make mistreaks"

N1DeltaWhiskey(at)comcast
Guest

Posted: Sun Apr 15, 2007 7:11 am Post subject: Battery insulation

In addition to the issues of possible heat buildup, chemical interaction, 

hard landing consequences, and FAA requirements, you might want to consider 

the blue plastic is most likely extruded polystyrene, one of the most 

combustible of expanded plastics.  Expanded polyiso insulation would be 

better in that regard, but may be worse chemically (the rest of the name is 

..isocyanurate!).



To me, the idea does not seem too cool.  If you need the 337 for the AI to 

buy off on this, could that include elimination of the battery box 

altogether?  In lieu of the box, install a properly anchored platform and 

tie-down for the battery.



FWIW, Doug Windhorn (thankful I have an experimental).



---

nuckollsr(at)cox.net
Guest

Posted: Sun Apr 15, 2007 5:12 pm Post subject: Battery insulation

At 01:16 PM 4/14/2007 -0700, you wrote:



 	  Quote: 	
		  



A friend has a Cherokee 140 with an original battery box beneath the rear 

seat. He has replaced the lead acid battery with a 16 AH RG battery. The 

RG battery is oriented the same as the lead acid battery had been. To keep 

the new battery from flopping around (it is much smaller than the old lead 

acid one) he inserted DOW HI (blue board foam) insulation around the four 

sides. I don't recall seeing any insulation under or over the battery. My 

question: Is this insulation OK or is there a chance that the battery 

could overheat if under heavy recharge?


	


   No



 	  Quote: 	
		    The installation looks nice and tidy and is very lightweight, but I'd 

 like to make sure he is not set up for a problem in flight. Please 

 comment if you can.


	


   The foam will be fine and lighter than plywood. We did

   use thin plywood to fill the gap around an RG battery

   when we STC'd the first B&C product onto the C-150 and

   many other airplanes later. But with greater thickness

   you're discussing, the foam would be better.



   Bob . . .



        ----------------------------------------

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

        ----------------------------------------

rtitsworth

Joined: 16 Jan 2006
Posts: 76
Location: Detroit, Mi

Posted: Sun Apr 15, 2007 7:31 pm Post subject: Battery insulation

Bob, etal,



If a foam spacer is not a problem, is there any thought behind using

something similar to help insulate/isolate a battery from the ships

vibration like thin rubber (baffling matgerial) or thin memory foam, etc.



Rick



--

fvalarm(at)rapidnet.net
Guest

Posted: Sun Apr 15, 2007 11:02 pm Post subject: Battery insulation

What about the expanding foam from a aerosol can commonly used for

insulating around doors/windows etc.



Bevan  



--

nuckollsr(at)cox.net
Guest

Posted: Mon Apr 16, 2007 4:44 am Post subject: Battery insulation

At 10:04 PM 4/14/2007 -0400, you wrote:



 	  Quote: 	
		  In a message dated 4/14/2007 8:13:28 P.M. Central Daylight Time, 

leoh(at)gci.net writes:

Bob,



The battery is not approved for the Cherokee but is FAA PMA' d and 

approved for many others I'm told. They will need a 337 to finish the 

install per his AI.



Leo

Thank You Leo,



In the event something leaks, has anyone yet investigated the suitability 

of the foam when it gets involved with corrosive gases? May not be 

considered a problem, but --- ??




	


   RG batteries don't leak.



   Bob . . .



        ----------------------------------------

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

        ----------------------------------------

nuckollsr(at)cox.net
Guest

Posted: Mon Apr 16, 2007 4:50 am Post subject: Battery insulation

At 08:10 AM 4/15/2007 -0700, you wrote:



 	  Quote: 	
		  

<N1DeltaWhiskey(at)comcast.net>



In addition to the issues of possible heat buildup, chemical interaction, 

hard landing consequences, and FAA requirements, you might want to 

consider the blue plastic is most likely extruded polystyrene, one of the 

most combustible of expanded plastics.  Expanded polyiso insulation would 

be better in that regard, but may be worse chemically (the rest of the 

name is ...isocyanurate!).



To me, the idea does not seem too cool.  If you need the 337 for the AI to 

buy off on this, could that include elimination of the battery box 

altogether?  In lieu of the box, install a properly anchored platform and 

tie-down for the battery.


	


   Best idea yet.



   Bob . . .

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