It has been 12 days since I installed the B-Stop and a full week since the cement plant should have returned to normal operations. As stated in this thread, I was only encountering trips on week days at very specific times.
I’ve measured the mA leakage from my 3 inverters and they added up to very close to the tripping threshold. See this discussion for easy reference: RCD tripping on shore power
Trevor’s Whitepaper