Enable Modbus
https://joy-it.net/files/files/Produkte/JT-DPM8605/JT-DPM8600-Manual_2025-07-18.pdf
https://joy-it.net/files/files/Produkte/JT-DPM8605/JT-DPM8600-Anleitung_2025-07-18.pdf

S-CS
  1

ESPhome configuration

substitutions:
  # Change this model to fit your particular one.
  # You can find it in Home Assistant as the device diagnostic "Model Name".
  model: "dpm8624"
  device_name: "dpm8624-controller"
  device_friendly_name: "dpm8624-modbus"
  device_description: "Power Supply"

#   # Model specific settings (Don't change these!)
#   XY6014_voltage_maximum: "60"
#   XY6014_voltage_accuracy: "2"
#   XY6014_voltage_multiplier: "0.01"
#   XY6014_current_maximum: "14"
#   XY6014_current_accuracy: "3"
#   XY6014_current_multiplier: "0.01"

# globals:
#    - id:   vin_undervoltage_theshold
#      type: float
#      restore_value: no
#      initial_value: '17'

esphome:
  name: $device_name
  friendly_name: $device_friendly_name

esp8266:
  board: d1_mini

# Enable logging
logger:
  level: INFO
  # Disable logging via UART, since we're using this for modbus communication
  baud_rate: 0

# Enable status LED
status_led:
  pin:
    number: GPIO2
    inverted: true

web_server:
  port: 80
  local: true
  log: false

# Enable Home Assistant API
api:
#  encryption:
#    key: !secret home_assistant_key
  reboot_timeout: 0s

ota:
  - platform: esphome
    #password: !secret ota_password

# Configure WiFi
wifi:
  networks:
  - ssid: !secret wifi_ssid
    password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "XY6014 Fallback Hotspot"
    password: ""

uart:
  id: mod_bus
  tx_pin: GPIO1
  rx_pin: GPIO3
  baud_rate: 9600
  # data_bits: 8
  stop_bits: 1
  parity: none

modbus:
  id: modbus1
  uart_id: mod_bus

modbus_controller:
  - id: dpm8624
    address: 0x01
    modbus_id: modbus1
    command_throttle: 500ms
    update_interval: 5s

time:
  - platform: homeassistant
    id: ha_time

# Sensors (readings)
sensor:
  - platform: modbus_controller
    modbus_controller_id: dpm8624
    name: "DPM Output Voltage"
    id: dpm_output_voltage
    register_type: holding
    address: 0x1001
    unit_of_measurement: "V"
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - platform: modbus_controller
    modbus_controller_id: dpm8624
    name: "DPM Output Current"
    id: dpm_output_current
    register_type: holding
    address: 0x1002
    unit_of_measurement: "A"
    accuracy_decimals: 3
    filters:
      - multiply: 0.001

  - platform: modbus_controller
    modbus_controller_id: dpm8624
    name: "DPM Temperature"
    register_type: holding
    address: 0x1003
    unit_of_measurement: "°C"
    accuracy_decimals: 0

  - platform: template
    name: "DPM Power"
    id: dpm_power
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    lambda: |-
      return id(dpm_output_voltage).state * id(dpm_output_current).state;

  - platform: total_daily_energy
    name: "Charge Today"
    power_id: dpm_power
    unit_of_measurement: "Wh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 0
    restore: false

# Controls (setpoints)
number:
  - platform: modbus_controller
    modbus_controller_id: dpm8624
    name: "DPM Set Voltage"
    address: 0x0000
    register_type: holding
    min_value: 0
    max_value: 60
    step: 0.01
    unit_of_measurement: "V"
    mode: box
    lambda: |-
      return x / 100.0;
    write_lambda: |-
      return (int)(x * 100.0);

  - platform: modbus_controller
    modbus_controller_id: dpm8624
    name: "DPM Set Current"
    address: 0x0001
    register_type: holding
    min_value: 0
    max_value: 24
    step: 0.001
    unit_of_measurement: "A"
    mode: box
    lambda: |-
      return x / 1000.0;
    write_lambda: |-
      return (int)(x * 1000.0);

switch:
  - platform: modbus_controller
    modbus_controller_id: dpm8624
    name: "DPM Output"
    address: 0x0002
    register_type: holding

Flash

# flash over TTY
esphome run dpm8624-modbus.yaml --device /dev/ttyUSB0

# flash over WiFi
esphome  -s device_name battery-charger-1 run dpm8624-modbus.yaml --device 192.168.178.x

Links
https://joy-it.net/de/products/JT-DPM8624