....a Summing node, in order to sum the three actual line power values,
so I can send out a MQTT value,
to control and provide my external boiler-heating with excess sun power?
....a Summing node, in order to sum the three actual line power values,
so I can send out a MQTT value,
to control and provide my external boiler-heating with excess sun power?
This already exists. Use dbus-spy or a mqtt explorer to find the path you want. Combined values are available for input and output power.
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