Issue integrating 100balance BMS with ESPHome via RS-485

ESPHome
61

I want to understand this issue so as not to ask more questions

62

We have concluded together that modbus_controller doesn’t give any data because it expects answer from 81. Right?
so this line doesn’t return anything:
float vv = (data[3]+data[4])* 0.1;
Right? Dead end.

You have to work with uart_debug.
Code in your post46 is where you need to work on.
Use the piece of code in my post58 in your uart_debug and get all those registers same way from 0x52 (bytes[4]) to 0x59 (bytes[13])

63

By the way, you only posted a screenshot of modbus registers. There are others, writeable registers?

64

I can post all the documentation that I have

65

Don’t be shy :wink:

66 
[22:33:46][D][uart_debug:114]: <<< 51:03:10:00:01:00:01:00:00:00:00:00:00:0D:00:00:00:00:00:F7:C9
[22:33:46][D][main:047]: Response data only had 21 bytes!!
67

I can’t do this, the forum doesn’t allow me to upload files here

68

https://dropmefiles.com/faInm

69

Sorry my mistake( serious brain fart). Every register is 2 bytes, so 21 is correct.

if (bytes.size() == 21) {
int chargingMosStatus = bytes[3] + bytes[4];
id(cms).publish_state(chargingMosStatus);
int dischargeMosStatus = bytes[5] +bytes[6];
id(dms).publish_state(dischargeMosStatus);
70

I’m not going to open files from that source, but have a look if there is writeable register for modbus id.

71

Second brain fart… :sleepy:

72

thanks, I’ll find the time and get on with it

73

You are almost there…

74

Greetings everyone, maybe the docs I’ve recieved from 100balance will come in handy:

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75

were you able to get this to work? I have a 100balance bms as well

76 
uart:
  - id: uart_0
    baud_rate: 9600
    tx_pin: D2
    rx_pin: D3
    
    debug:
      direction: BOTH
      dummy_receiver: true
      after:
         delimiter: "\n"
      sequence:
          - lambda: |-
              UARTDebug::log_hex(direction, bytes, ':');
              ESP_LOGD("main", "Response data only had %d bytes!!", bytes.size() );
              std::string str(bytes.begin(), bytes.end());

              if (bytes.size() == 27) {
               ESP_LOGD("main", "Response data %d", bytes[0]);
               ESP_LOGD("main", "Response data %d", bytes[1]);               

               int tv = (bytes[3] << 8) | bytes[4];
               id(tbv).publish_state(tv);

               int curent = ((bytes[5] << 8) | bytes[6]) - 30000;
               id(cd).publish_state(curent);

               int so = (bytes[7] << 8) | bytes[8];
               id(soc).publish_state(so);

               int di = (bytes[23] << 8) | bytes[24];
               id(dif).publish_state(di);

              }
modbus:
  - id: modbus0
    uart_id: uart_0
    send_wait_time: 1000ms
    disable_crc: true

modbus_controller:
  - id: bms
    address: 0x81
    modbus_id: modbus0
    command_throttle: 5000ms
    update_interval: 2s
    setup_priority: -20

sensor:
  - platform: template
    id: tbv
    name: TolalVoltage # 0x38 register
    filters:
      - multiply: 0.1
    accuracy_decimals: 1
    unit_of_measurement: "V"

  - platform: template
    id: cd
    name: CurrentData # 0x39 register
    filters:
      - multiply: 0.1
    accuracy_decimals: 1
    unit_of_measurement: "A"

  - platform: template
    id: soc
    name: SOC # 0x3A register
    filters:
      - multiply: 0.1
    unit_of_measurement: "%"      
    accuracy_decimals: 0

  - platform: template
    id: dif
    name: DiffVoltage # 0x42 register
    filters:
      - multiply: 0.001
    accuracy_decimals: 3
    unit_of_measurement: "V"    







  - platform: modbus_controller
    modbus_controller_id: bms
    id: custom
    custom_command: [0x81, 0x03, 0x00, 0x38, 0x00, 0x0B]  # 0x38 first register to read, 0xB = 11 register count (27 byte response)
77

Thanks!! Did you wired the bms via UART port directly to ESP32 board ( TX pin 6 and RX pin 5)? Sorry the original thread mentioned RS485. If it’s RS485… i’m guessing you’ll need the TTL → RS485 board in between?

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78

I’m using a UART RS485 converter

1 Like
79

Nope, not with the default esphome RS485 component

1 Like
80

@Footz355 @dimksum Can both of you shared your wiring diagram to the 100 balancer I’ve tried setting this up for the past weekend and getting no luck getting any info. For context these are the hardware I’m using along with the 100balance bms port shown previously.

image
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