I have a two Quattro system on my boat. Both are connected to the input mains (220V) and to the 12V battery banks.
The outputs are completely decoupled.
There is absolutely no response by the Quattros. No lights, no charging current, nothing.
I don't really know how to troubleshoot this?
The AC-Input is fine. The outputs are secured by circuit breakers, so there can be nothing wrong there. I even removed the 12V-connection, but nothing happens either. The 12V-connection is protected by fuses, so I doubt this could have fried it. Especially both Quattros at once.