Recent content by Dala

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  1. Dala

    Reviving an undercharged BYD 11kWh pack

    Status update, we are getting closer: View: https://www.youtube.com/watch?v=64wVE4mU1_4 Still having issues, the solar inverter doesn't detect the battery, the battery just blinks the EC111 error code. Ideas?
  2. Dala

    Reviving an undercharged BYD 11kWh pack

    That is exactly what I'm about to find out @netforceatg ! Will soon have a new video up on the project!
  3. Dala

    Reviving an undercharged BYD 11kWh pack

    While I was connecting the modbus cables yesterday, I noticed the LED on the side is blinking in a pattern. I read the manual, and supposedly the BMU has this issue: So, thinking about opening it up and inspecting the precharge circuit...
  4. Dala

    Reviving an undercharged BYD 11kWh pack

    This is the sunspec modbus protocol, register 803. It contains all the fault signals that the battery sends, so with this info I should be able to manually decipher what error bits are active. One of these is UNDER_SOC alarms, so let's see if any of those are triggered. But yeah, I boosted some...
  5. Dala

    Reviving an undercharged BYD 11kWh pack

    Lowest cell was 2.5V, highest 3.0V I charged all cells up to 3.1V. I made a video on the pack: View: https://www.youtube.com/watch?v=dKlKllykYCw Now, it still doesn't turn on. SOC% shows as 0% in the app. Any ideas on what to try next? I will try to get Modbus going so I can read the fault...
  6. Dala

    Reviving an undercharged BYD 11kWh pack

    Hi @PAF , yes it is the BYD HVM 11.0 , so 4 big modules. Great suggestion with the charging, byt my LIPO charger only goes to 3.3V min :/ Looks like I need to hunt for another charger... I will ofcourse take more pictures of it, and try to reverse engineer the RS485 communication so I can...
  7. Dala

    Reviving an undercharged BYD 11kWh pack

    Sadly not possible, they are riveted together from factory!
  8. Dala

    Reviving an undercharged BYD 11kWh pack

    Good link! I still need to go thru the other half of the battery to see if there's any cells that are lower than 2.6V, I really want to bring it up to a normal SOC% range, since these packs are not meant to go below 7%SOC (and that 2.6V is way below that already). But now just worried that a...
  9. Dala

    Reviving an undercharged BYD 11kWh pack

    Hi forum! So I am in the middle of reviving a "broken" BYD 11kWh battery pack, that will be used with a Fronius Solar inverter. Backstory, the pack was left at 0%SOC at -25C and not really wanting to work after that, tripping main breaker. So I dismantled the pack and most cells range between...
  10. Dala

    Yes the wires are connected to the same contactor as the main battery. But the wires are...

    Yes the wires are connected to the same contactor as the main battery. But the wires are extremely thin compared to the main battery wires. It is here on this picture on the bottom right. Small fuse and red wires.
  11. Dala

    Dala's Leaf buildthread (2015 Nissan Leaf)

    Sounds like a new thread would be good for your project :)
  12. Dala

    Dala's Leaf buildthread (2015 Nissan Leaf)

    No, if you have a chemistry that is not LMO then the voltage will probably be higher under load on the extender pack compared to the original battery. This will make current want to go almost fully from the extender battery, and you will pull probably 10-30kW of power from the extender pack...
  13. Dala

    Dala's Leaf buildthread (2015 Nissan Leaf)

    No! The wires are really thin and only made for a 6kW maximum load (theoretically max 10kW). Don't do that!
  14. Dala

    Dala's Leaf buildthread (2015 Nissan Leaf)

    @laasrocket, the total cost estimate for this project will be below 700€!
  15. Dala

    Dala's Leaf buildthread (2015 Nissan Leaf)

    Directly to the car for simplicity. Constructing an adapter inbetween would require 100x more effort (and I'm sure other people have tried and failed at this).
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