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[Request] Add support for intermediate meter to measure the outputpower of the inverter #899

@greymda

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@greymda

Is your feature request related to a problem? Please describe.

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Describe the solution you'd like

Basically the idea comes from the python script https://github.com/reserve85/HoymilesZeroExport (in detail about this option https://github.com/reserve85/HoymilesZeroExport/blob/5b226225a6799eab91857a2c18d21d854c568726/HoymilesZeroExport_Config.ini#L133) and consists on having the (optional) support for an intermediate meter that measures the outputpower of the inverter as it is faster than the DTU current_power value (and possibly more reliable?).

In my particular care I have a Shelly EM with 2 clamps and one monitors the Grid input and the second is measuring the Solar input. I would like to have an option to use the values from the second clamp for Dynamic Power Limit functionality.

Screenshot 2024-04-20 at 21 21 09

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acknowledgedenhancementNew feature or requestinvertermeteraddresses or addressed by the introduction of a new power meter which meters inverter output

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