On VRM I see a frequency difference between IN and OUT in advanced view.
Grid is present.
Can this difference be somehow explained?
"Can this difference be somehow explained? "
Short version: "measurement inaccuracy "
The frequency difference or shifting is an intentional thing as part of the program of ess as far as i know or understand. One of the mechanisms to do with the way feedback to grid is prevented.
You have awesome grid stability by the way! Our ess works hard the grid is always shifting frequency very unstable in bith voltage and frequency.
The other thought here is as mentioned in a previous comment, the Victron is not a lab measuring instrument and never claims to be, have you actually checked the input and output with an ocilloscope? That would rule out whether it is an actual problem or just a position of a sensor internally causing a slight difference.
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