#2 digits I was hoping for some
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I found a workaround:
- Create a group with all entities that provide power output
- Create a template sensor that sums up the state values of all members of that group
- Profit!
What's missing: populate the group automatically. (I have no idea how to do that.)
Well, it does not work via the UI (at least I don't know how to make it work via the UI).
But adding an entity to groups.yaml is fairly easy.
Still, I would love to find an automated way.