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I imagine that it is the BMU which manages the capacity of the battery. Isn't it possible to fool it by modifying the messages on the CAN bus? Can you give us the name of the vendor on Alibaba ? How did you choose it ?

I would like to add an additional pack to my residential battery. As I use BMS cards, I would like to have a CMU numbered 11. To renumber a CMU, is the simplest method to rewrite the first byte of the eeprom with an arduino for example?

I have just bought a CMU board to do some tests from an English person who lives in France and who still has several boards to sell. His price is not expensive (25€). If you live in Europe, I can put you in touch with him. I'm not sure he'll be able to tell you the card number. By the way...

Hello everyone, I would like to add a detail that will be useful to those who one day decide to use the battery of their Miev for another use. CMUs boards listen, from startup, for 0x3C3 frames only if these frames are sent regularly. If the transmission of these frames stops for a moment before...

Thank you very much for your expalanations. I better understand the charge and the balancing. I will try to do the balancing by myself.

Thank you for your answer. Indeed, I feel like balancing makes sense when the current going into the battery is low. What I am trying to understand is the consumption curve of the charger at the end of charge (in pink on the following graph). Why does the curve have this shape and does not...

Hello, For my residential battery project, I would like to understand in detail how battery balancing works. Does this balancing only occur at the end of the charge or also during use of the car? Does anyone have logs of CAN communications between the BMU card and the CMU cards in different...

Hello, Did someone ordered batteries from this vendor ? I'm interested by trying to replace the cells of my battery, but I don't know how to trust such vendors on alibaba ?

Yes, news are still good, I charged 3 packs until 3,7V per cell. My power supply is to low, but I will order a 400V power supply to allow me to keep all the pack charged (and it will be more convenient when I develop the balancing source code) I disconnected all the packs from the CAN bus...

Thank you Kiev for your advice thanks to which I am perhaps resuscitating my battery. The cells that I recharge at 250mA now have a voltage of 3.2V!

Thank you very much for your answer. I only have a 60V DC power supply, I will try that on half a battery.

Thanks a lot for your answer. It seems that I let my battery discharge too long, it is completely empty and certainly dead: I measure 55V across its terminals. CMU cards may refuse to operate when the cells are over discharged. It's a shame, my project was almost finished. My project was to...

Hello everyone, I started developing a residential battery to store solar electricity. My project is well advanced, I managed to connect a homemade card to the battery, read the CAN frames sent by the CMU cards and control a Solax inverter to manage the charging/discharging of the battery...