I'm preparing my multiplus II to connect to the grid and put my critical loads behind AC out 1.
Until now my multiplus was in parallel with the grid without load on AC out 1. (ESS is configured)
Today I linked my critical load behind AC out 1, multiplus was not connected to the grid but it did trip my RCD 30mA.
If I switch my bord back to the grid also on a 30mA RCD it doesn't trigger. I switched it back to the multiplus and it did trip the RCD.
What could be wrong here ?