[RE-wrenches] Home grid stacked battery heating

[Jerry Shafer]

Wrenches
I have also used the turtle heater and it's just enough to keep everything
up and operating. Insulation and a warm thermal mass makes it all hold
together
Funtimes
Jerry

On Sun, Nov 5, 2023, 2:03 PM Allan Sindelar via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I did this modification to a 16kW Blue Ion LiFP bank during installation,
> following this guide, Darryl. Blue Planet had sent me this. Shortly after
> initial installation a plumber had installed an electric space heater in an
> unheated space with water pipes, which of course soon drained the batteries
> to LVD, so the BMS had shut them down. The BMS won’t accept a charge until
> the batteries were about 1 1/2 degrees F above freezing. I did a winter
> service call and worked with BP tech support. I plugged the same space
> heater into a portable gennie and pointed it to the batteries, and as soon
> as the BMS registered above freezing it allowed recharge from the array.
> As I recall, besides the bubble/Mylar insulation (which was surprisingly
> easy to install) the system used an 18w terrarium heating pad in the bottom
> shelf under the batteries and a 9w pad on the upper shelf, controlled by an
> external freeze-prevention thermostat. With a sufficient whole-house array
> it’s proven to be a negligible load.
> It’s a standalone system. I don’t recall the low-temperature discharge
> limit; it’s quite a bit lower than the minimum charge temperature. And
> summer heating is irrelevant with the thermostat. The rest you can get from
> Blue Planet.
> Allan
>
> On Nov 5, 2023, at 2:03 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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>> --
>>
>> *Allan Sindelar*
>> allan at sindelarsolar.com
>> RETIRED
>>
>>
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