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Old 08-10-2019, 06:06 PM   #1
henry9
 
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Default AGMís affected by engine heat?

Hi,

Iíve got the old school lead acid batteries that Iím considering replacing with AGMís due to the corrosive effects to the nearby brake lines. I know Roadtrek switched to AGMís but do they degrade faster due to engine heat? Just wondering, definitely going to replace with seals AGMís!

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2008 Agile

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Old 08-10-2019, 06:13 PM   #2
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Default Re: AGMís affected by engine heat?

Underwood might be a minor problem in traffic jams but usually you cruise along at 70 or so and engine heat is being blown away. What killed mine was extreme cold of 10-15 degrees or so for a week.
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Old 08-10-2019, 06:49 PM   #3
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Default Re: AGMís affected by engine heat?

There's another recent thread where someone put a layer of Reflectix around his under-hood AGM .. and it made a 20 F difference in their temperature
(i'll add a link if i find it)((done two posts down v))

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Old 08-10-2019, 07:06 PM   #4
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Default Re: AGMís affected by engine heat?

I don’t know if AGMs degrade faster with heat than FLAs, but it’s true that heat isn’t a friend to ANY battery system or chemistry.

I think the reality is that we face a series of compromises with our battery systems and chemistries that at best, we can optimize, but not make perfect. The factors I see are costs, location, safety, and the effort/work/time that must be accommodated to change a given configuration. It’s all a type of iron triangle where you can’t make the system perfect, so you choose which are the most important factors for your situation, and then allow yourself to be satisfied with that.

Don’t let the perfect be the enemy of the good!

(For me, my two GC1 FLA batteries are under the hood, and I have Reflectix around them to give some heat shielding.)

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Old 08-10-2019, 07:17 PM   #5
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Default Re: AGMís affected by engine heat?

RockDoc's thread: https://sprinter-source.com/forum/sh...ad.php?t=78407

--dick
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 08-10-2019, 08:19 PM   #6
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Default Re: AGMís affected by engine heat?

I have 115Ah AGM Fullriver under the hood since 2013 coupled with one in the van. Didnít noticed battery degrading. Battery is well insulated.

It is certainly not the best scenario but it was a reasonable tradeoff due to space limitation.
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Old 08-11-2019, 06:10 PM   #7
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Default Re: AGMís affected by engine heat?

Thanks everyone for info. Much appreciated!
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Old 08-13-2019, 06:21 PM   #8
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Default Re: AGMís affected by engine heat?

Not sure if how much degradation if any, but itís most likely not good for the battery when exposed to extreme engine heat, not to mention the ill effects of constant higher charging voltage (14+) from alternator when battery is hot. I fabricated a battery enclosure on mine using aluminum sheet lined with heat insulation mat, the batteries temp stays below 90ļF (per Blue Sky/ and Magnum battery temp monitor) even after long drives.


Picture with the front heat shield removed.
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