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  #1  
Old 04-26-2019, 01:02 PM
HansLab HansLab is offline
 
Join Date: Jan 2015
Location: Netherlands
Posts: 65
Default Temps

All,
I plan to purchase a light yet strong battery (https://www.super-b.com/en/product/14//sb12v20p-sc), however it's maximum temp is 55 degrees Celsius. It passed my mind that the real temps under our hood are much higher.
Anyone an idea about the actual temps? I might consider a scoop there for cooling this battery, but if not necessary I rather wouldn't.
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build & sold project Kitfox IV
Bought project & building RV12 #120742
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  #2  
Old 04-26-2019, 03:33 PM
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JohnInReno JohnInReno is offline
 
Join Date: Jun 2005
Location: Prescott Valley/Chandler AZ
Posts: 326
Default Temps from RV9A

I strongly urge you to review all of the posts from and about EarthX on this forum. Having said that, the temps from my RV9A have topped out at 71 C and I live in Arizona. The temperature strips are directly on the EarthX battery:

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RV-9A N946PM 600+ hours since 2013
Nevada/Arizona

Last edited by JohnInReno : 04-26-2019 at 06:40 PM.
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  #3  
Old 04-27-2019, 12:32 AM
HansLab HansLab is offline
 
Join Date: Jan 2015
Location: Netherlands
Posts: 65
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the EarthX brochure (https://earthxbatteries.com/wp-conte...9.Brochure.pdf) mentions max surrounding temps of 60 degrees C.
That is way less than you have in your compartiment, John?
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build & sold project Kitfox IV
Bought project & building RV12 #120742
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  #4  
Old 04-27-2019, 07:44 AM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,823
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A maximum high temperature of 63 degrees C was measured by a thermocouple attached to a mounting bolt of the voltage regulator which is located on the firewall shelf inside of the engine compartment. The voltage regulator is cooled by a blast tube which does not blow onto the mounting bolt or thermocouple.
Below is a table showing voltage regulator temperatures in Fahrenheit.
Perhaps the most meaningful temperatures are after engine shutdown with no cooling air and no electrical heating.
_
rpm._t-couple._oat
2690 _ 128.___81
5374 _ 146 _ _ 78
5026 _ 135 _ _ 77
0 _ _ _ 143 _ _ 82
5035 _ 136 _ _ 75
5337 _ 127 _ _ 80
5275 _ 130 _ _ 80
5559 _ 136 _ _ 71
0 _ _ _ 140 _ _ 78
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RV-12 Flying
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  #5  
Old 04-27-2019, 02:22 PM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,345
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Before flying season started this year I placed two temperature recording strips under the cowling of my RV-12 - one on John Deere Voltage Regulator and one on top of ignition unit. Hasn't been hot yet (northern Ohio) and only four flights...



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Jim Stricker
Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 425

LSRM-A Certificate 2016
Special Thanks... EJ Trucks - Crew Chief A-4 Skyhawk
and MJ Stricker (Flight Instructor) - 1st Lt./Captain B-17H
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  #6  
Old 04-28-2019, 07:49 PM
rcarsey rcarsey is offline
 
Join Date: Jul 2012
Location: North Brunswick, NJ
Posts: 85
Default

Quote:
Originally Posted by HansLab View Post
All,
I plan to purchase a light yet strong battery (https://www.super-b.com/en/product/14//sb12v20p-sc), however it's maximum temp is 55 degrees Celsius. It passed my mind that the real temps under our hood are much higher.
Anyone an idea about the actual temps? I might consider a scoop there for cooling this battery, but if not necessary I rather wouldn't.
Nobody has mentioned it in this thread yet, but I guess I should mention that the RV-12iS now comes with the EarthX. However, there is a lot more air passing though the cowl on the iS due to the louvers on the top of the cowl.
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  #7  
Old 04-29-2019, 04:04 AM
crashley crashley is offline
 
Join Date: Jun 2009
Location: hazelwood north vic
Posts: 170
Default temps

I believe the temps under the cowling will get way past 55 degrees especially after shut down when a cooling vent wont help
also is a lithium battery suited to the rotax style of battery charging
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  #8  
Old 04-29-2019, 08:25 AM
pilotyoung pilotyoung is offline
 
Join Date: Jan 2018
Location: Birmingham, AL
Posts: 108
Default High Temps

It would be good to hear from Cathy at EarthX about this subject?
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John D. Young, RV-12 Owner
Serial Number 120022, N6812Y
Bought it as a flying airplane in Feb. 2018
Just passed 140 hours flight time in RV-12, and 10,000 hours mostly in corporate jets. I am a CFI; CFII; MEI; and a advancd Ground Instructor, CFIG; and hoping to be able to help new RV-12 owners by doing some transition training for new builders and owners in RV-12's.
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