The integration of Solar2MQTT in HomeAssistant has changed fundamentally. SoftWareCrash and Jarnsen did a Discover together. This means that no entries are required in the configuration.yaml to create the sensors.

Requirements:

1. MQTT broker installed in HomeAssistant

2. Solar2MQTT must be installed and MQTT configured.

3. There must be data in the WebUI.

Integration in HomeAssistant:

1. Check whether data is available in the WebUI!!

2. Go to Settings

3. Go to Configure and click HA Discovery on

4. Click Save settings, the ESP will do a reboot

Display in HomeAssistant

1. As a device in MQTT list

2. The device itself

3. In the dashboard

If there no data in the dashboard, reboot Home Assistant!

thanks to @Jarnsen for the work!