I have just installed a Victron bmv 712 unit in my boat. Setup for house and started battery banks. The display shows voltage of main and auxillary batteries, but is giving a fixed amp and watt reading, both positive and both excessive, I have worked the setup program and consulted the manual, making sure all functions are turned on. I tried the synchronize and zero calibrate functions on both the head unit and phone and they do nothing. I did this with all input power shut off, batteries fully charged. Then applied fridge & other components to see the draw...no change. ie. it is not reading current or power. I tried reversing the negative battery terminals on the shunt...no change.
I see others have had similar problems but do not clearly see the answer. Is this a defective unit? Surely not the cable. I have not taken a photo of the shunt installation but will attach soon.