Actually thinking of my last post - pretty unlikely the heater being on
would coincide exactly with opening a battery that had gone to 5 V.
But It strikes me that Relion would really want to get to the bottom of
this - especially if they thought this story might spread and hurt their
reputation - not to mention just ethical followup on a safety hazard!
So If it were me I'd call Relion and let them know we (the Wrenches
List) really wants to know what happened and their reputation is in
question. The fact they manufactured it - they are the ones to do the
forensics on what happened - by analyzing the cells and conductors in a
safe lab environment they can probably trace back where the
short/overcurrent occured.
Best,
Jeff C.
Hey Jay,
So at the 4:35 mark of this quick review of available LFP batteries on
the market at the time (2019) - Will Prowess states that "they
(Relion) are the only battery that has a built-in battery heater (I
think he was implying as standard equipment and not an option).
Is it possible the battery heater circuit stuck on?
https://www.youtube.com/watch?v=gOqQp2Xjr6U&t=372s
Just a thought - not sure how you would go back and check that out though!
Best,
Jeff C.
Village Power Design
Dave Angelini Offgrid Solar <mailto:[email protected]>
June 17, 2021 at 5:01 PM
I thought of a few more ways this could have happened. The installer
over torqued the battery terminals. There was not SPD protection in
the system and it got zapped and escalated. Working on SPD's now for a
guy. He does not see the value and knows everything! Pretty hot out
here in the West! 5PM ! Take care! Cheers!
----------------------------------------------------------------------------------------------------------------------------------------------
Maybe the BMS was never tested by Relion for all of the possible failure
modes? Maybe it was tested and it got thru QC.
I know very little about
this company. Do they meet the standards like,
manufacturing facilities
are fully certified to ISO 9001/14001 and OSHA 18001 standards.
Meets UL
9540
CERTIFICATION STANDARDS
* IEC 62133
* UL 1973
* UL 2271
*
CE
* UN 38.3
Not trying to be a pain either Jay. You know the LFP I use!
Good Luck!
*Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail [email protected] <mailto:[email protected]>
text 209 813 0060*
On Thu, 17 Jun 2021 11:55:35 -0600, jay <[email protected]> wrote:
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jay <mailto:[email protected]>
June 17, 2021 at 10:55 AM
HI All,
The cover never got all the way off before it was blown off, it was
just started to be opened, so no way there was an external ignition
source. If it was an explosion it was all from internal components
except for possibly some O2 coming from the outside.
My other question still hasn’t been answered.
If the BMS isn’t taking care of over/under voltage and over current
what is it doing to prevent damage to the battery?
( this system was within the input PV or output inverter watts/amps of
the battery specifications) And I just found out that on the day of
failure, no one has been living there for months and only a grundfos
SQFlex and a few lights were on, no big loads.
Now maybe I’ve been under the false understanding that this is the
primary job of the BMS?
Yes I know that there is also cell balancing, % monitoring, blue
tooth, wifi etc that can be included in the BMS but to me thats all
secondary.
Hopefully someone can clear this up for me.
jay
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Dave Angelini Offgrid Solar <mailto:[email protected]>
June 17, 2021 at 7:01 AM
My .02 on this, and just a guess, the open loop charging parameters
were not set right or charge limits for the battery were too high. The
other way to kill LFP is large loads exceeding the battery max
discharge current.
Closing the loop eliminates just about all of those issues. It brings
the battery into the safety area of LA batteries that are still hard
to beat offgrid. I am not saying you can't blow the top off a LA
battery eitherWink
*Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail [email protected] <mailto:[email protected]>
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On Thu, 17 Jun 2021 07:23:07 -0400, John Blittersdorf
<[email protected]> wrote:
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John Blittersdorf <mailto:[email protected]>
June 17, 2021 at 4:23 AM
This just proves the weak link is the BMS.
I had the honor of replacing the BMS in that exact model in a stack of
3 batteries. Luckily it was on the bottom shelf so I could pull the
monster out onto the floor to get access to the lid. The lid is
sealed shut but with persistence it opened. I was working with their
tech support and following their instructions. I disconnected it from
the other two that were in a parallel configuration before opening.
Battery voltage was zero at the terminals. I did voltage checks at
various checkpoints to confirm it was the BMS at fault. Relion sent a
new BMS which I carefully installed and it has worked fine since. Had
I seen this photo first, I may have not been so eager to see the
inside of that battery.
John Blittersdorf
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jay <mailto:[email protected]>
June 16, 2021 at 12:22 PM
Hi Jeff,
I don’t know if you saw the photo. No cutting involved.
The top is removed with roughly 14 fasteners.
No tools or prying was involved in the removal of the top cover.
jay
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