We just installed out battery bank and multiplus in our TT, when switching from solar to shore power we get a loud buzzing sound and the inverter goes into overload and shuts off.
asked
Multiplus 3000/12/120 overload after last buzzing
What is the shore power like voltage and stability wise?
Sometimes the shore connection has some interesting wiring. So that can also be an issue. So a short on that side can cause it too.
Have you tried disconnecting all AC loads and just plugging in like that?
