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Under discharge 1 cell went low
#1
Could it be the point in the battery string to which i connected the inverter? Maybe its better to connect it to the middle of the battery bank?

Unable to attach pictures
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#2
Sure you can attach pictures, unless you don't have them to begin with. Full Edit or post New Reply (not Quick Reply) and either drag the files to the Image section or click the Image section and browse to the image(s) you wish to add.

Without at least an ansii drawing of what your schematic is, we have no way of knowing what happened.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
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#3
If one of your battery packs dropped below 1.0V, it sounds like your BMS wasn't working properly or isn't configured to cut power when one of the batteries falls out of spec? It's difficult to tell without further information on your setup.
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#4
apologies for the delay posting the pictures, in other forum i can just attach them , and here the size seems to be limited. I understand the costs associated , no worries.

so here they are
[Image: IMG_20200324_170204_zpsxlwilcc5.jpg]

[Image: IMG_20200324_102749_zpshryvftsd.jpg]

Now I changed the position of the connections for the inverter , to the middle of the string. I will test tomorrow and see the behavior of my battery .
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#5
Can't  make out how much out of balance the cell is. The host. store. share. logo is over the low cell.  The battery is composed of lifepo4 cells?
to attach a photo here drag and drop it in box that says Drop files here to upload once loaded there click on image, then preview the post to confirm the pic is there.
 Later floyd
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#6
If your images are too large to upload here (hadn't heard that one before), then open them in Paint and resize down to 75% and save them and upload the new size. Please do not use off site photo sharing sites. Examples of reasons is the Host Store Share watermark.


I just checked, 12.15Meg is the largest size allowed to upload. That is a huuuge image (not only file size, but dimensions). Definitely resize by 50% and you'll be good to go, and plenty of clarity will be left.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
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#7
Connect positive at the far left for good balance.
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#8
Your drawing shows the cells connected in parallel, but the voltage on your phone app shows the typical generic bms, which needs to be hooked up in series. So either you have your diagram wrong or there's something we're missing here. If you have your cells in parallel as in your diagram, they would have 'balanced' each other out to around .02V
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