Last year I had an Victron installer install a Multiplus on my boat while I was on anchor (no shorepower). Everything worked including when running my generator. While moving the boat north for hurricane season I stopped at a couple of marinas and plugged into shorepower with no problem ie. everything worked as it should. When I arrived at my home marina and tried to plug into shore power my Multiplus tripped the breaker on the shore power pedestal (my marina recently upgraded all power pedestals). When I disconnect the Multiplus AC Input and AC Output and connect them together (input directly to the output), everything on the boat works as it should. So by taking the Multiplus out of the equation I can connect to shorepower and operate normally. Any ideas on why I'm having this problem?