I have a Multiplus-II 12/3000 installed in my RV. I have 6 battle-born lithium batteries in parallel connected. I also have some ancillary equipment such as smart-solar, disconnects, fuses, cerbo gx, etc. I have disconnected the smart solar from the equation when troubleshooting.
When the batteries become fully charged, and the multi goes to Float, the outlet on the shore side starts to buzz. This is especially apparent if the shore outlet is only 15/20A. At our home, if you let it go for a little while it trips the GFCI for the outlet.
During bulk or absorb there is no issue, the outlet is silent. I am in the US - the multi is set to 60Hz and not allowed to feed back to the grid. I'm happy to provide any other relevant config or details as needed.
Are there any other troubleshooting steps I can take, or where can I go from here? I appreciate your help in advance.
