A couple of thoughts you may consider…
A 30mA RCD can trip at a Maximum of 30 mA and a minimum of 50% of that rating or 15mA. We have found many actually trip in practice at about 20mA. That is perfectly within spec.
Modern equipment has many Electromagnetic Compatibility filters. These filters reduce radio frequency transmission and have capacitors between neutral and active and ground. That means they have a very small amount of ground leakage. It can be about 0.5mA each. Many other devices have leakage as a function of their mains input circuitry and that may be 1 or 2 mA.
The equipment does not have to be on for this leakage to be present. Obviously the breaker feeding the equipment has to be closed but the equipment itself doesn’t have to be on.
What this means is that a perfectly well designed, perfectly safe, normal installation with very many individual items fed from the one RCD can trip that RCD as a consequence of the capacitive currents caused by these leakage mechanisms. It is annoying and even more annoying is that the “smoking gun” can never be found because the tripping is caused by an accumulation of small capacitive currents, not one big resistive leakage current to ground.
You can methodically try to isolate and resolve the issue and you can notice that disconnecting some items can “fix the problem” but the problem isn’t really fixed because no single item is actually faulty. It is an accumulation of very small leakage currents that sum to around 20mA and consequently trip the RCD.
Normally in a house or commercial installation this is solved by spreading the accumulated leakage over a couple of RCDs. That is difficult when feeding a boat from a single marina pedestal.
Additional resources still need to be added for this topic
Faults with Victron equipment are best discussed directly with your dealer - this can be formalised with this support request form.
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I have a Victron multiplus 120/3000 I have 3 GFCI Plugs, when on shore power they work perfect when on inverter the light goes red for a period of time then they shut off not sure where I should look to solve the problem