[RE-wrenches] Home grid stacked battery heating

[Kirk Bailey]

Something else to consider is that many of the modern LFP batteries use a
relatively large amount of power just to keep the internal BMS/contactor(s)
energized, independent of whether the battery is being charged/discharged.
For example, I believe the Fortress eFlex 5.4's use on the order of 12-20 W
continuously, *each*.  A stack of four generates a significant amount of
heat from this alone!

Cheers,

Kirk Bailey
kirk at abundantsolar.com


On Sun, Nov 5, 2023 at 12:28 PM Howie Michaelson via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Daryl,
> Being in Vermont and dealing with lots of off-grid, occasional use
> systems, I'm definitely interested in others' experience with cold weather
> installations.
> Howie Michaelson
> Sun Catcher
>
>
>
> On Sun, Nov 5, 2023 at 3:03 PM Darryl Thayer via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Great site, Allan, but many facts still need to be included.  Was there a
>> discharge or charge going on? How much power was being drawn by the
>> heaters?  If this is for a standalone system, energy consumption is very
>> important. What is the lower temperature cell discharge limit of Blue
>> Planet?   What concern was taken for the summer and overheating?   What are
>> the blue planet-specific heat and weight of the batteries?  More questions,
>> but I doubt if anyone else is interested.     Thank you.
>>
>> On Thu, Oct 26, 2023 at 11:49 AM Sindelar Solar via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> You might be able to get some ideas from this. It's worked well for me
>>> on one job.
>>> Allan
>>>
>>> On 10/25/2023 2:24 PM, Dana Orzel via RE-wrenches wrote:
>>>
>>> I know we have had this run thru before & wanted to see if any new
>>> options for heating LI batteries.
>>>
>>>
>>>
>>> I have an 8 pack of Homegrid LI batteries that is off grid with Radian
>>> 8048a. Originally, they were not going to be there for the winter, now it
>>> is a possibility they may visit. Plenty of solar 6KW+, hopefully generator
>>> back up waiting on delivery currently.
>>>
>>> Currently located in main room high ceilings/log cabin.
>>>
>>> Looking at creating an insulated closet & using terrarium heaters
>>> controlled if over 51volt heater on AC from inverter. Or just boxing in
>>> with 3-4” of blue board Styrofoam….
>>>
>>>
>>>
>>> Has anyone else done something similar?
>>>
>>> Has anyone done this & it did not work?
>>>
>>>
>>>
>>> Thought & suggestions…..
>>>
>>>
>>>
>>>
>>>
>>> _________________________________________________________
>>>
>>> Dana Orzel                GREAT SOLAR WORKS!
>>>
>>> C – 208.721.7003      E – dana at solarwork.com
>>>
>>> W - www. greatsolarworks.com     www.solarwork.com
>>>
>>> *“Responsible Technologies for Responsible People since 1988!”*
>>>
>>>
>>>
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>>> --
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>>> *Allan Sindelar*
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>>> RETIRED
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