Would it be possible to create a sensor adding up all the unknown energy usages as a individual line?
How can you add up things you don’t know?
In the bar chart the sum of the unknown energy usage is shown for each hour. So the amount of energy is know by deducting the total energy usage minus the tracked individual items. I therefor would think that the total can be shown as a calculated individual item so that the overall unknown energy can be investigated.
Oh right. Now I understand what you want. It was not very clear from your very brief initial description.
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