Sync time from ESPhome to Inverter

[eogmau]

Hi,
I know some people are having issues with time on the inverter going out of sync if they do not use the official Wi-Fi stick.
I have implemented below script in ESPhome to set the time via Modbus to the inverter which works very good on my Deye SUN-5K-SG03LP1-EU model.

script:
  - id: setClock
    then:
    - lambda: |-
        // 1. Get the modbus controller instance (replace 'deye_modbus' with your ID)
        esphome::modbus_controller::ModbusController *controller = id(${modbus_controller_id});

        // 2. Get current time
        time_t now = ::time(nullptr);
        struct tm *time_info = ::localtime(&now);
        
        int seconds = time_info->tm_sec;
        int minutes = time_info->tm_min;
        int hour = time_info->tm_hour;
        int day = time_info->tm_mday;
        int month = time_info->tm_mon + 1; // tm_mon is 0-11
        int year = time_info->tm_year + 1900; // tm_year is years since 1900

        // 3. Check if time is valid (localtime returns 1970 if not synced)
        if (year != 1970) {
          // 4. Create the Deye-specific payload (3 registers)
          // Per the doc, time is packed into 3 registers
          
          // Register 22: Year (Hi-Byte, based on 2000), Month (Lo-Byte)
          uint16_t reg_22 = ((year - 2000) << 8) | month;
          
          // Register 23: Day (Hi-Byte), Hour (Lo-Byte)
          uint16_t reg_23 = (day << 8) | hour;
          
          // Register 24: Minute (Hi-Byte), Second (Lo-Byte)
          uint16_t reg_24 = (minutes << 8) | seconds;

          std::vector<uint16_t> rtc_data = {reg_22, reg_23, reg_24};
          
          // 5. Create a modbus command to write 3 registers starting at address 22
          esphome::modbus_controller::ModbusCommandItem set_rtc_command =
              esphome::modbus_controller::ModbusCommandItem::create_write_multiple_command(controller, 22, rtc_data.size(), rtc_data);
          
          // 6. Submit the command to the send queue
          controller->queue_command(set_rtc_command);
          
          ESP_LOGI("ModbusLambda", "Deye RTC set to %02d:%02d:%02d %02d/%02d/%04d", hour, minutes, seconds, day, month, year);
        } else {
          ESP_LOGW("ModbusLambda", "Cannot set Deye RTC, ESPHome time not synced (Year is 1970).");
        }


time:
  - platform: homeassistant
    id: homeassistant_time
    on_time:
      - seconds: 0
        minutes: 0
        hours: 10
        then:
          - script.execute:
              id: setClock

[pawlin]

there is already such functionality https://github.com/Lewa-Reka/esphome-deye-inverter/blob/main/pv-inverter.Deye-SG0XLP3.yaml#L32 and it is working

[eogmau]

That functionality is implemented for 3 phase inverters only, it is missing for 1 phase SUN-5K-SG03LP1-EU, that why I have opened this discussion.