Use Hiking DDS238-2 ZN/S Energy Meter with Home Assistant

Hiking DDS238-2 ZN/S is a cheap €25 single phase energy meter which can measure import and export energy in addition to all the standard parameters, and has a Modbus interface over RS485.

Home Assistant energy dashboard using Hiking DDS238-2 energy meter
Home Assistant energy dashboard using Hiking DDS238-2 energy meter.

I used this Modbus registry information to create this device template for Home Assistant where the meter is attached to the Protoss PE11 RS485 to TCP gateway (available for €25) available on IP 123.123.123.123 which must be adjusted for your setup or switched to a serial config:

modbus:
  - name: Protoss PE11
    type: tcp
    host: 123.123.123.123
    port: 502
    timeout: 0.5
    sensors:

      - name: DDS238-2 ZN-S Total Energy
        device_class: energy
        state_class: total
        unit_of_measurement: kWh
        address: 0
        count: 2
        data_type: uint32
        scale: 0.01
        precision: 2

      - name: DDS238-2 ZN-S Export Energy
        device_class: energy
        state_class: total_increasing
        unit_of_measurement: kWh
        address: 8
        count: 2
        data_type: uint32
        scale: 0.01
        precision: 2
    
      - name: DDS238-2 ZN-S Import Energy
        device_class: energy
        state_class: total_increasing
        unit_of_measurement: kWh
        address: 10
        count: 2
        data_type: uint32
        scale: 0.01
        precision: 2

      - name: DDS238-2 ZN-S Voltage
        device_class: voltage
        unit_of_measurement: V
        address: 12
        data_type: uint16
        scale: 0.1
        precision: 1

      - name: DDS238-2 ZN-S Current
        device_class: current
        unit_of_measurement: A
        address: 13
        data_type: uint16
        scale: 0.01
        precision: 2

      - name: DDS238-2 ZN-S Power
        device_class: power
        data_type: int16
        unit_of_measurement: W
        address: 14
        
      - name: DDS238-2 ZN-S Reactive Power
        device_class: apparent_power
        data_type: uint16
        unit_of_measurement: VAr
        address: 15
        
      - name: DDS238-2 ZN-S Power Factor
        device_class: power_factor
        unit_of_measurement: '%'
        data_type: uint16
        address: 16
        scale: 0.001
        precision: 3

      - name: DDS238-2 ZN-S Frequency
        device_class: frequency
        unit_of_measurement: Hz
        data_type: uint16
        address: 17
        scale: 0.01
        precision: 2

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