We have a 3-phase system with 3x Quattro 8 kVA. There is city power (grid) connected to AC-in 1. Grid is quite unstable. The system has been working fine for over a year, taking energy form the grid in pass-through and to charge the batteries when there is no sun.
It has suddenly stopped taking power from the grid. There has not been any system or configuration change as far as we we concerned. I can see there is voltage input at AC-in1 VRM, but this is not being used. There is no related alarm from when the problem started (6 Oct). We tried restarting the system but has not helped (see attached pics)
Any idea why would this happen? Could be an internal fuse has blown up? Or may be a change in the grid side?
Any help is appreciated, thanks