2 Inverters connected to one BMS

[OselDusan7]

Today I started to using 2 inverters ( Goodwe ) connected to one BMS ( JKBMS ver 11 ) . I have one ESP board connected using cable to BMS TTL port, and another ESP connected over Bluetooth. Both inverters have their own CAN connected to ESP. It works for me for few hour without any problem.

[Sleeper85]

Perfect, thanks for the info.
I also supervise the same BMS with Wire and BLE.

[OselDusan7]

Unfortunatelly, my BLE version on Olimex LAN doesn't work for me stable . Communication with BMS seem to be correct and stable , but CAN communication works just for 30minutes. Then it says OFF. After downloading ESP again , it works for another 30min.
Now I am trying to find out what is wrong in my setup. It could be two inverters on one BMS , or Olimex ESP, or becuse I used 3,3V CAN converter .
For my other two stable connections I am using standart ESP without LAN , wired and with TLA1050 5.0V CAN converter.

[OselDusan7]

Hello Sleeper85. Could you please tell me how I can restart ESP32 when Canbus communication is OFF ?

[Sleeper85]

Automatically with programming?

[OselDusan7]

Yes. Automatically. Instead of setting message , that it is OFF , just restart it. I am also not at home for now , So I would like to temporary "solve" my problem until I can figure out , why it is loosing communication after 30 minutes

[Sleeper85]

YAML code :

button:
  - platform: restart
    name: "Restart button"
    id: restart_button
    internal: true

Lambda code :

id(restart_button).press();

This should be added to this part of the code.

              if (id(can_ack_counter) < 20) {                     // Inverter ACK ? => CANBUS ON
                
                id(can_ack_counter)++;                            // CANBUS ACK counter ++
                id(can_msg_counter)++;                            // CANBUS MSG counter ++
                return true;                                      // Condition OK
                
              }
              else if (id(can_status) == "OFF") {                 // CANBUS already OFF ?
                
                return false;                                     // Nothing to do
                
              }
              else {
              
                id(can_status) = "OFF";                           // Set CANBUS Status to OFF
                id(canbus_status).publish_state(id(can_status));  // Publish text sensor
                ESP_LOGI("main", "No rx can 0x305 reply, Inverter not connected/responding...");
                return false;                                     // Condition NOK
                
              }

Maybe like this:

              if (id(can_ack_counter) < 60) {                     // Inverter ACK ? => CANBUS ON
                
                id(can_ack_counter)++;                            // CANBUS ACK counter ++
                id(can_msg_counter)++;                            // CANBUS MSG counter ++
                return true;                                      // Condition OK
                
              }
              else if (id(can_status) == "OFF") {                 // CANBUS already OFF ?
                
                id(restart_button).press();                       // ESP32 restart
                return false;
                
              }
              else {
              
                id(can_status) = "OFF";                           // Set CANBUS Status to OFF
                id(canbus_status).publish_state(id(can_status));  // Publish text sensor
                ESP_LOGI("main", "No rx can 0x305 reply, Inverter not connected/responding...");
                return false;                                     // Condition NOK
                
              }

[OselDusan7]

Thank you very much. I found on some forums, to use button for that , but it looks crazy for me. I will try. Thank you very much again