Enjoy your Omnik solar production at the Home Assistants new Enery dashboard with the latest version of Omnik Data Logger. An update was needed to make the MQTT energy sensors compliant with the new Energy feature. The Energy feature was released with the latest version of Home Assistant.
As you can see I just started monioring my self. For Solar Production you can use the Energy today or the Energy total entity. The Energy today sensor is more accurate for this aim. If you have integrated DSMR (Dutch Smart Meter R.) as well you can also use these entities to add Grid consumption and Return to grid.
If you want to add the consumtion of specific devices and you have entities for those devices, you could add those entities as well.
Enjoy!