Batteries à 0%

[Vince2]

Bonjour

J ai une batterie lifpo4 de 16kwh, avec un bms jkbms, j ai configuré sur le multiplus 2 gx un soc mini à 10%

Tous les 1 mois environ, j ai ma batterie qui tombe à 0% sans raison (pas de panne de courant, pas de consommation normal,….)

Ce que je remarque c est que le pourcentage passe de 10 à 0% d un coups, vous voyez ça aussi?

C est quoi le pb avec mon installation/configuration ?

Je ne peux pas laisser ma batterie avec ce fonctionnement, car à chaque fois l état de vie de ma batterie se dégrade d après mon jkbms, je suis maintenant à 89 de soh pour 3 mois d utilisations !

[MikeD (Mike)]

A sudden drop to 0% from a BMS usually results from one cell reading under voltage. Check your Min cell voltage graphs on VRM and see if the cell number is being reported - if it is, is it always the same cell number? This can be caused by a fault on the sense wire, or in the BMS, rather than at cell level.

[Vince2]

Merci pour l info

Je ne trouve pas l info dans vrm,

j ai regardé dans home assistant, mais il me manque les donnés des id tension les olus basse pendant les 30 minutes ?

Sinon, j ai toutes les autre infos ,notamment ici la tension cc diminue progressivement, ça ne serait peut être pas une chute brutal?

[MikeD (Mike)]

As the overall battery voltage drops significantly (4v) over 5 min, it looks like you might have some weak cells, or the battery needs balancing.

[Vince2]

Comment je peux procéder pour les équilibrer ?

Je n ai jamais fait cette manipulation, c est le mode float?

[Vince2]

Bonjour

Rectificatif de mon message plus haut, j ai un calibration des cellules qui est paramétré à 3.4v par le bms jkbms, et c est dimanche dernier que la batterie a été chargée à 100%

Sur ce graphique on voit clairement que j ai eu un pb de tension

Mais quand j essaye de voir quelle cellule pourrait faire chuter la tension, il y en aurait pas qu une seule

Home Assistant 2026-01-03 08_15_21.pdf (82,4 Ko)

J avoue que je suis perdu, qu est ce qu’il pourrait expliquer ce phénomène ?

[Vince2]

entity_id,state,last_changed

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sensor.victron_mqtt_c0619ab7be9d_battery_512_battery_min_voltage_cell_id,00::08,2026-01-02T17:43:44.099Z

[ChiefSolar]

Hi. Is your JK BMS connected to your Cerbo device, and does it show up in venus.local, the GUI or remote console from VRM? Normally you only have to select the BMS and view Details. That’ll show you things like the battery temperature and cell lowest/highest voltages including the cell number.

Can you confirm this?

You could also check the cell voltages yourself. No idea what kind of batteries that you are using, but maybe it is possible?

[Vince2]

Bonjour

J ai un multiplus 2 5000 gx, qui est connecté à ma batterie lifpo4 qui a un bms jkbms

Je vois certains paramètres, mais pas ceux que vous me dites( id cellules), vous pourriez m en dire plus?

[ChiefSolar]

Good morning. Please login from VRM into your remote console (look for Console in the menu, or at the bottom of your screen) and go to your JK BMS. Then select Details. Here’s mine for example:

[Vince2]

Merci pour l’information

Mais j ai l info de la tension de cellule la basse maintenant, pas hier soir à 18h25 quand mon SOC est descendu à 0%?

[ChiefSolar]

Oh yes correct. Now go to Advanced in the VRM menu and add the following graph:

Please share yours.

[Vince2]

Je l ai fait plus haut, mais je n ai pas l id de le cellules la plus faibles comme vous?

[ChiefSolar]

Just click on the graph

[Vince2]

Merci

Ça serait donc la N° 8

Je dois donc vérifier les connections de cette cellules, mais je suis sur que tous est serré correctement

[ChiefSolar]

Yes. I was already afraid of cell #8 being either bad or not properly connected. Could you check that first? Otherwise you may need a replacement cell. May I ask what brand and type cells you have? Also. Make sure to visually inspect the cells. Look for swelling or broken seals at the top.

[Vince2]

Elles paraissent toutes intègrent

Et je viens de regarder la dernière fois que la batterie est retombé à 0%,

Ce n est pas la même cellule, et d ailleurs c est plusieurs cellules qui sont identifiées lors de la descente de tension

Mes cellules sont des catl

[Vince2]

Elles paraissent toutes intègrent

Et je viens de regarder la dernière fois que la batterie est retombé à 0%,

Ce n est pas la même cellule, et d ailleurs c est plusieurs cellules qui sont identifiées lors de la descente de tension

Mes cellules sont des catl

[Vince2]

Rectificatif

En zoomant sur les defauts, c est bien la cellule n° 8 qui fait chuter la tension

Je vais inverser les cellules pour voir si Le défaut s inverse

[ChiefSolar]

Did you top balance the cells before charging them to 100% with the inverter?

Also. You can (normally) connect via Bluetooth with the BMS and download the log files. I would also check the wire resistance of cell #8 to check if it off compared to the rest. That should then also show up after swapping two cells.