slight tweak to https://github.com/chickey/RS485-WiFi-EPEver/blob/master/epever.yaml

epever.yaml

---
esphome:
  name: epever
  friendly_name: epever

esp8266:
  board: d1_mini
  framework:
    version: recommended

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  fast_connect: true

api:

ota:

web_server:
  port: 80

status_led:
  pin:
    number: D4
    inverted: true

# Disable logging so we can use hardware UART
logger:
  level: INFO
  baud_rate: 0

uart:
  id: mod_bus
  tx_pin: TX
  rx_pin: RX
  baud_rate: 115200
  stop_bits: 1

modbus:
  flow_control_pin: D1
  id: modbus1
  send_wait_time: 200ms

modbus_controller:
  - id: epever
    ## the Modbus device addr
    address: 0x1
    modbus_id: modbus1
    setup_priority: -10
    command_throttle: 200ms
    update_interval: 30s

text_sensor:
  - platform: modbus_controller
    modbus_controller_id: epever
    name: "rtc_clock"
    id: rtc_clock
    internal: true
    register_type: holding
    address: 0x9013
    register_count: 3
    raw_encode: HEXBYTES
    response_size: 6
    #                /*
    #                E20 Real time clock 9013 D7-0 Sec, D15-8 Min
    #                E21 Real time clock 9014 D7-0 Hour, D15-8 Day
    #                E22 Real time clock 9015 D7-0 Month, D15-8 Year
    #                */
    on_value:
      then:
        - lambda: |-
            ESP_LOGV("main", "decoding rtc hex encoded raw data: %s", x.c_str());
            uint8_t h=0,m=0,s=0,d=0,month_=0,y = 0 ;
            m = esphome::modbus_controller::byte_from_hex_str(x,0);
            s = esphome::modbus_controller::byte_from_hex_str(x,1);
            d = esphome::modbus_controller::byte_from_hex_str(x,2);
            h = esphome::modbus_controller::byte_from_hex_str(x,3);
            y = esphome::modbus_controller::byte_from_hex_str(x,4);
            month_ = esphome::modbus_controller::byte_from_hex_str(x,5);
            // Now check if the rtc time of the controller is ok and correct it
            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;
            int year = time_info->tm_year % 100;
            // correct time if needed (ignore seconds)
            if (d != day || month_ != month || y != year || h != hour || m != minutes) {
              // create the payload
              std::vector<uint16_t> rtc_data = {uint16_t((minutes << 8) | seconds), uint16_t((day << 8) | hour),
                                                uint16_t((year << 8) | month)};
              // Create a modbus command item with the time information as the payload
              esphome::modbus_controller::ModbusCommandItem set_rtc_command = esphome::modbus_controller::ModbusCommandItem::create_write_multiple_command(epever, 0x9013, 3, rtc_data);
              // Submit the command to the send queue
              epever->queue_command(set_rtc_command);
              ESP_LOGI("ModbusLambda", "EPSOLAR RTC set to %02d:%02d:%02d %02d.%02d.%04d", hour, minutes, seconds, day, month, year + 2000);
            }
            char buffer[20];
            // format time as YYYY-mm-dd hh:mm:ss
            sprintf(buffer,"%04d-%02d-%02d %02d:%02d:%02d",y+2000,month_,d,h,m,s);
            id(template_rtc).publish_state(buffer);

  - platform: template
    name: "RTC Time Sensor"
    id: template_rtc

  - platform: modbus_controller
    modbus_controller_id: epever
    name: "rtc clock test 2"
    id: rtc_clock_test2
    internal: true
    register_type: holding
    address: 0x9013
    register_count: 3
    raw_encode: HEXBYTES
    response_size: 6

switch:
  # - platform: modbus_controller
  #   modbus_controller_id: epever
  #   id: reset_to_fabric_default
  #   name: "Reset to Factory Default"
  #   register_type: coil
  #   address: 0x15
  #   bitmask: 1

  - platform: modbus_controller
    modbus_controller_id: epever
    id: manual_control_load
    register_type: coil
    address: 2
    name: "manual control the load"
    bitmask: 1

sensor:
  - platform: wifi_signal
    name: "WiFi Signal"
    update_interval: 60s

  - platform: modbus_controller
    modbus_controller_id: epever
    id: pv_input_voltage
    name: "PV array input voltage"
    address: 0x3100
    device_class: voltage
    unit_of_measurement: "V"
    register_type: read
    value_type: U_WORD
    accuracy_decimals: 1
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: pv_input_current
    name: "PV array input current"
    address: 0x3101
    device_class: current
    unit_of_measurement: "A"
    register_type: read
    value_type: U_WORD
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: pv_input_power
    name: "PV array input power"
    address: 0x3102
    device_class: power
    unit_of_measurement: "W"
    register_type: read
    value_type: U_DWORD_R
    accuracy_decimals: 1
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: charging_voltage
    name: "Charging voltage"
    address: 0x3104
    device_class: voltage
    unit_of_measurement: "V"
    register_type: read
    value_type: U_WORD
    accuracy_decimals: 1
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: charging_current
    name: "Charging current"
    address: 0x3105
    device_class: current
    unit_of_measurement: "A"
    register_type: read
    value_type: U_WORD
    accuracy_decimals: 1
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: charging_power
    name: "Charging power"
    address: 0x3106
    device_class: power
    unit_of_measurement: "W"
    register_type: read
    value_type: U_DWORD_R
    accuracy_decimals: 1
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: load_voltage
    name: "Load voltage"
    address: 0x310C
    device_class: voltage
    unit_of_measurement: "V"
    register_type: read
    value_type: U_WORD
    accuracy_decimals: 1
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: load_current
    name: "Load Current"
    address: 0x310D
    device_class: current
    unit_of_measurement: "A"
    register_type: read
    value_type: U_WORD
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: load_power
    name: "Load power"
    address: 0x310E
    device_class: power
    unit_of_measurement: "W"
    register_type: read
    value_type: U_DWORD_R
    accuracy_decimals: 1
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: battery_temperature
    name: "Battery temperature"
    address: 0x3110
    device_class: temperature
    unit_of_measurement: °C
    register_type: read
    value_type: S_WORD
    accuracy_decimals: 1
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: device_temperature
    name: "Device temperature"
    address: 0x3111
    device_class: temperature
    unit_of_measurement: °C
    register_type: read
    value_type: S_WORD
    accuracy_decimals: 1
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: epever
    id: battery_soc
    name: "Battery SOC"
    address: 0x311A
    device_class: battery
    unit_of_measurement: "%"
    register_type: read
    value_type: U_WORD
    accuracy_decimals: 0

  - platform: modbus_controller
    modbus_controller_id: epever
    id: Charger_status
    name: "Charger status"
    address: 0x3201
    register_type: read
    value_type: U_WORD
    accuracy_decimals: 0