The system is a 24V system so everyting is connected to the neg of the first battery and the plus of the second battery
Well, victron strongly recommends a balancer, but if @water_rat says you can do without, then Iâd propose you rma the batteries and eventually the bms.
I donât understand why do you need a balancer ? Can you please explain
To guarantee that both batteries are charged equally, the bms only balances the cells inside a battery.
Maybe that would apply to different batteries, but these two are exactly the same.
The cells inside the batteries are also all the same, but you need a bms to balace them.
And, all this only works if your charger setting are correct, which i believe might not be the case, this problem is high in the top 10 of this board.
Like specified in the first post, all the settings used are the default lithium setting that are for the victron lithium batteries. This is the idea, to have all the setup from Victron and everythings is ready to go !
Where in the manual of the Victron Smart Lithium batteries do you find that?
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OK, I understand that you have difficulties with reading. Indeed the OP only says âVictron systemâ. The other terms âVictron BMSâ and âVictron Smart batteriesâ are an invention by you.
BTW: I too have a âVictron systemâ, but my battery is not from Victron.
I believe this has been answered by the OP.
I really havenât read the newest manuals, but for me installing 1 or 3 balancers is GMP, the 50⏠for a balancer stands in no proportion to the 2000⏠of the two batteries, no customer has complained as of yet, no battery that i installed has died.
Itâs ok that you have your own opinion about using balancers or not but please donât say that Victron âstrongly recommendsâ it, if thatâs not the case.
Please, donât discuss these things on the board, get used to using pmâs.
In the past victron recommended balancers, if they donât do it any more : mea maxima culpa, i missed the notice.
The TO didnât use a balancer, now his battery is dead and victron will replace it.
But somebody saved 50âŹ
Hi @NVs,
If the battery has failed, then you should contact your supplier to discuss if it is covered under warranty.
Do you have a system wiring diagram?
Itâs really hard to say what the cause of the failure is without being on site to thoroughly inspect the installation, and seeing the battery itself. Going under 1V it could even be some mechanical failure internally and now some bad connection.
I agree that itâs strange that the BMS did not signal the fault as the battery voltage dropped. You said
It is normal and expected that it continued to allow charging, what should have been stopped was discharging.
It is not clear from your video and description exactly how the discharge control circuit is wired, that may be where the fault is? Not necessarily, but definitely somewhere I would look first when troubleshooting to make sure it doesnât just happen again with a replacement.
Itâs also important that the correct profile is set on the MultiPlus. Lots of parts that need to be done correctly for these systems. There are some good trainings here for our lithium batteries, I donât consider them for DIY beginners without training - Victron Energy - Victron Professional
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Hello @guystewart, and thank you for your reply.
The two batteries are connected together as a single unit for the system, which doesnât recognize how many batteries are plugged in. Is this correct ? Even if there were an issue with one of the consumers, why would one battery remain charged (and balanced) while the other is completely empty? This has occurs with a BMS and a battery protect that is setup with the lithium profile.
The entire system is set up using the default Lithium-ion profile from Victron.
My initial mistake was to use 2 batt instead of one 25V, but this is a different story
Indeed, Iâll send it back for the warranty.
Just for my records, what is or could be that clicking noise ?
I donât have a lot of diagnostic info to work with from your system, so all I can do is swing at possibilities, which isnât very useful, and most likely is wrong.
Did you take any screenshots from VictronConnect? Can you connect to the Lithium Battery with VictronConnect when you put the 12V on the 1V battery terminals?
An explanation for how once battery is at 1V with the other at 13V is a sudden mechanical failure, but I am not saying that is what has occurred.
It would be a lot easier with a full wiring diagram for your system.
I donât know what that sound is, I havenât heard that before.
Iâm unable to connectâthe battery isnât showing up, and I donât want to damage it further. I also donât like those sounds, which is why Iâm not charging the battery.
Hereâs a picture with a quick overview of the system.
Hi @NVs
This single line is the crux of the fault finding.
It doesnât properly represent how the system is wired, and if it isnât done correctly could definitely lead to the failure.
If any of those loads or charge sources arenât connected correctly it could fail. There are many possibilities for an incomplete connection as it can be quite complicated with so many parts, which is also why I am guessing they werenât included in the design, but they must be.
Probably the most important thing to note is that the Load disconnect and the charge disconnects are different circuits, here they are drawn as one.
Hi @guystewart , indeed this is an important point, but the system was working for 1,5years. I have to check again everything and Iâll do a real schematics.
