Does anyone climate control their battery packs?

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bashers

New member
Joined
Oct 1, 2021
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8
I'm building a power storage system this month based around a BMW i3 battery.
This has spent its working life in a climate controlled zone under the car, heated and cooled as required.
The 8 modules are 44V 94ah cells and the published ratings suggest 10ah more storage per module at 25 degrees (centigrade) than at -5 degrees, and that amounts to almost 4kw lost capapcity

I plan to install a heating element (large vivarium heat mat) in this pack before installing it in the garage and setting it on a themostat to keep it above say 15 degrees

This is the most efficient was to store and consume power, so why do i see very little mention of this in these forums??
 

Oberfail

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Joined
Jun 22, 2021
Messages
103
This is the most efficient was to store and consume power, so why do i see very little mention of this in these forums??
Because it requieres a lot of work to implement correctly and having them sit in the basement, where its pretty much always between 10 & 20°c is not bad either.
 

Wolf

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Joined
Sep 25, 2018
Messages
1,613
so why do i see very little mention of this in these forums??
Duno. But I have quite a bit of discussion about HVAC (more heating than cooling) in my thead.

I implemented a system in my battery box and once all the winkles where ironed out it works quite well.

Wolf
 

OffGridInTheCity

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Joined
Dec 15, 2018
Messages
1,788
I have 2 sets - the house powerwall and the trailer.
- Powerwall - is under the house for 'climate control' and ranges from 55F/13C to 75F/24C thru the year - which I hope will reduce stress.
- Trailer - The mini-spit is running year-round ranging from 60F/15C (as low as it will go for winter) to 80F/27C summer (so I can go in/out comfortably). I also have RV heating pads under the battery for <30F/01C if something happens to the mini-split.

Particularly for the house powerwall (~9,000 cells) I'm hoping the controlled temps + 40% DOD will actually get me to 5,000 or 8,000 cycles... I'm at 1,421 cycles so far. 8,000 cycles would be 18 more years (I'd be 85) - so I guess its also if I live that long :)
 

Redpacket

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Feb 28, 2018
Messages
1,330
Also would depend on the temp range where you are + exposure to sun/heat.
 

jdeadman

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Joined
Mar 28, 2017
Messages
959
Definitely required if you have temps that go below zero. Lithium cannot be charged when below 0 degrees C I live in Canada and we get weeks of -40 Degrees (it does not matter C or F) and when I will be setting up a Off-grid 4 season house I will my batteries climate controlled but in a separate Shipping container that will be temperature regulated the same way my house and garage will be and that is via Hot/Cold water radiant.
My Camp right now is not temp controlled but I only use it during the summer and the temps are always in the positive and I even though it does get hot here +40C I have not noticed my batteries have any issues with that temp
 
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