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Hi
Where in your system is the ground connected to neutral? Can you switch off your RCD and measure the resistance between neutral an ground of your consumer system? There should be no connection after the RCD.
Is the ground relay of your Multi active? Does the Multi have a good ground connection?
I would look at the generator's output to make sure there is a safety ground to neutral bond inside the generator or in the wiring to the Multi. While a floating neutral/hot system should not trip an RCD, any leakage (possibly capacitive) in the loads could be creating some current imbalance between hot and neutral.
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GX - Generator auto start/stop
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