I have Victron Phoenix Multiplus 12v 3000va 120 amp Inverter on my Narrowboat. Since it has been in a boatyard for some work including some new welded steel work and replacement of a shore supply mains socket there has been a problem. When the inverter is switched on with the green led showing a steady light, the yellow bulk and absorption led’s flash on and off. The inverter is providing 230 ok but I have not been able to test the 230 supply and charging aspects, as I have not had a shore supply to connect up to. I would be grateful for any thoughts on this?