question

@BarneyBlough

So there are a couple possibilities which could cause this to happen. The first could be physical installation related and the second could be the initial configuration. The easiest and most accurate way to get you up and running is if its possible, could you post a screenshot of the first status screen after you select and connect to the SmartShunt in the Victron Connect App, as well as a screenshot of the battery settings page where you initially configured all of the battery size and capacities during set-up. And lastly a photo of the physical wiring and mounting of the SmartShunt and the Orion.

A common problem is to have the charger(s) connected to the battery negative not the shunt's load/system side. NOTHING goes on the battery negative except the connection to the shunt battery negative input.

You didn't mention what your loads are. If there are no loads in your system there won't be anything to reduce the SOC from 100%.

If the battery is full and the internal BMS has shut it off from charging then there will be no current flowing into or out of the battery. The Orion will supply close to 400W of power which is enough to run 2 small fridges if it can take power from somewhere. Shut the Orion off and let the battery run the fridges and see what happens. Then if you see a discharge current then you know thst is working. When the SOC drops down then turn the Orion back on and watch the battery charge up.

I would suspect maybe a fuse has blown, loose cable, or there is another switch that is isolating the battery. Even a dead battery will draw some current.