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Battery heater

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Steve Kelly

Joined: 08 Jul 2016
Posts: 18

Posted: Fri Feb 03, 2017 1:32 pm Post subject: Battery heater

While waiting for the preheat on my engine I got to thinking about warming up the battery a little.  Was thinking of slipping a small silicone pad type heater in between the battery and the box.  Don't really want to install it permanently.  They make a 25 or 50 watt model.  Anyone see any problem doing this.  I know they can get rather hot, but I haven't used one this small.  The battery is a PC680.  This one has a metal case on it.  Any thoughts on which size to use?

  Steve

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Steve

user9253

Joined: 28 Mar 2008
Posts: 1920
Location: Riley TWP Michigan

Posted: Fri Feb 03, 2017 5:19 pm Post subject: Re: Battery heater

Can a heater be attached to the underside of the battery box so that it does not actually touch the battery?  I would be worried about damaging the battery from a localized hot spot.

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Joe Gores

Steve Kelly

Joined: 08 Jul 2016
Posts: 18

Posted: Sat Feb 04, 2017 4:35 am Post subject: Re: Battery heater

Yeah.  Heating from the bottom would probably be better.  The bottom of the box is open.  Maybe I can put a steel plate on the bottom of the box and attach the pad with a magnetic strip.  Any thoughts on the size to use- 25 or 50 watt.

 Thanks, Steve

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Steve

bobnoffs

Joined: 04 Jul 2012
Posts: 132
Location: northern wi.

Posted: Sat Feb 04, 2017 5:32 am Post subject: Battery heater

i played with this exact thing a month ago. i used a 25 watt stick on and encased it in a sheet metal envelope about 4'' x 6 ''. on a piece of plywood i put it under an odessey 625. it raised the temp about 8 deg/hour. with good contact to the battery the thing would have a temp about 130 deg. in free air the envelope would get near 200 deg. if i used it my plane i would set it on something that didn't conduct heat as well as metal and never run it for more than 6 hrs or when it wasn't cold enough to effect the batteryi wouldn't go over 25 watts. then i decided that when it was cold enough to slow down the battery it was too cold to go flying.i am talking 10-15 deg.



 bob noffs

On Sat, Feb 4, 2017 at 6:35 AM, Steve Kelly <amsk22(at)gmail.com (amsk22(at)gmail.com)> wrote:

 	  Quote: 	
		  --> AeroElectric-List message posted by: "Steve Kelly" <amsk22(at)gmail.com (amsk22(at)gmail.com)>

 

 Yeah.  Heating from the bottom would probably be better.  The bottom of the box is open.  Maybe I can put a steel plate on the bottom of the box and attach the pad with a magnetic strip.  Any thoughts on the size to use- 25 or 50 watt.

  Thanks, Steve

 

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bobnoffs

Joined: 04 Jul 2012
Posts: 132
Location: northern wi.

Posted: Sat Feb 04, 2017 5:43 am Post subject: Battery heater

i just posted about this and then read joe's post. when i tested this thing out i checked temps every hour with an infrared temp probe. the heater is so small at 25 watts and the metal envelope spread the heat out that i never found temps on the bottom of the battery get anywhere too warm.BUT ...this was with oat's and a battery at  around 10 above. it could be different if you run this thing accidentally when oat is 70 deg. the heater pad is for sure hot enough in free air to damage it. 



 bob

On Fri, Feb 3, 2017 at 7:19 PM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:

 	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

 

 Can a heater be attached to the underside of the battery box so that it does not actually touch the battery?  I would be worried about damaging the battery from a localized hot spot.

 

 --------

 Joe Gores

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=465729#465729

 

 

 

 

 

 

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bobnoffs

Joined: 04 Jul 2012
Posts: 132
Location: northern wi.

Posted: Sat Feb 04, 2017 6:21 am Post subject: Battery heater

the pad and envelope reaches 

On Sat, Feb 4, 2017 at 7:40 AM, bob noffs <icubob(at)gmail.com (icubob(at)gmail.com)> wrote:

 	  Quote: 	
		  i just posted about this and then read joe's post. when i tested this thing out i checked temps every hour with an infrared temp probe. the heater is so small at 25 watts and the metal envelope spread the heat out that i never found temps on the bottom of the battery get anywhere too warm.BUT ...this was with oat's and a battery at  around 10 above. it could be different if you run this thing accidentally when oat is 70 deg. the heater pad is for sure hot enough in free air to damage it. 



 bob

On Fri, Feb 3, 2017 at 7:19 PM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:

 	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

 

 Can a heater be attached to the underside of the battery box so that it does not actually touch the battery?  I would be worried about damaging the battery from a localized hot spot.

 

 --------

 Joe Gores

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=465729#465729

 

 

 

 

 

 

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 Electric-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List

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 eferrer" target="_blank">http://forums.matronics.com

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 ====================================

 b Site -

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 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

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