Sermatec Inverter for Home Assistant

Installation

Manual

1. Download integration.
2. Copy the folder custom_components/sermatec_inverter to your config directory.
3. Restart Home Assistant.
4. In Home Assistant, go to Settings -> Devices & Services -> + ADD INTEGRATION -> search for Sermatec Inverter -> fill in host and port -> click submit.
5. Done! Now you can see all the sensors in Integrations under Sermatec Inverter.

Notes:

• IP is probably assigned dynamically by your router's DHCP server. I recommend setting a static IP (available on most routers), otherwise you would probably need to change the IP in the config once in a while.
• The default port is 8899.

Tips

Calculating total energy

To use this integration with Energy Dashboard or to calculate energy usage/import/export etc. you need to use the Riemann sum integration. You can use a new GUI setup in a Helpers category (which is recommended), or an old yaml config method, example is below. Do not forget to set:

• metric prefix (unit_prefix) to k and integration time (unit_time) to h (hours) to get values in kWh - important to be able to use these in the Energy dashboard!
• integral method (method) to left, otherwise there will be very inaccurate results!

sensor:
  - platform: integration
    source: sensor.solar_inverter_grid_export
    name: Grid export
    unique_id: sermatec_energy_grid_export
    unit_prefix: k
    round: 2
    method: left
  - platform: integration
    source: sensor.solar_inverter_grid_import
    name: Grid import
    unique_id: sermatec_energy_grid_import
    unit_prefix: k
    round: 2
    method: left
  - platform: integration
    source: sensor.solar_inverter_pv_total_power
    name: PV total energy
    unique_id: sermatec_energy_pv_total
    unit_prefix: k
    round: 2
    method: left
  - platform: integration
    source: sensor.solar_inverter_pv1_power
    name: PV1 energy
    unique_id: sermatec_energy_pv1
    unit_prefix: k
    round: 2
    method: left
  - platform: integration
    source: sensor.solar_inverter_pv2_power
    name: PV2 energy
    unique_id: sermatec_energy_pv2
    unit_prefix: k
    round: 2
    method: left
  - platform: integration
    source: sensor.solar_inverter_battery_charging_power
    name: Battery charging energy
    unique_id: sermatec_energy_battery_charging
    unit_prefix: k
    round: 2
    method: left
  - platform: integration
    source: sensor.solar_inverter_battery_discharging_power
    name: Battery discharging energy
    unique_id: sermatec_energy_battery_discharging
    unit_prefix: k
    round: 2
    method: left

Daily, weekly or monthly consumption

To track consumption per specified time interval you can use Utility Meter.

Supported devices

Only tested device is the Sermatec SMT-10K-TL-TH. However, probably all residential hybrid inverters by Sermatec should work.

Communication script

Inverter communication script is in development in this repository, which includes also a detailed documentation.

Disclaimer

Because the protocol used for local communication is reverse-engineered (due to the lack of the official documentation), I am not responsible for any damage that this integration could cause to your inverter or to your house wiring / electrical equipment.