Prometheus Exporter for WattWächter Pro

In an another installment of nobody cares but I am having a great time over here by myself, I wrote another prometheus exporter, this time for SmartCircuits GmbH WattWächter Pro optical energy meter readers compatible with almost all energy meters in use in Germany as well as various other places in Europe.
Given my experiments with grid tied solar systems and the required monitoring to ensure that things actually do what they’re supposed to be doing I ended up wanting to monitor the energy consumption in other places as well which lead me to these fantastic little WattWächter Pro devices. They are affordable, easy to install, seemingly well built and their software stack appears to be complete, flexible and reliable.

As always I hope that this helps somebody accomplish something useful at some point but this project might be entirely just for me, prebuilt binaries the exporter can be found in the releases section of the Github repo. Happy hacking

14.03.2026