Multi 3kw/120A not adequately charging

If your shunt is inadvertently synchronising to 100% your charged voltage setting on the shunt is probably too low, it is best set 0.2V below absorption voltage. See the FAQ

https://community.victronenergy.com/t/shunt-battery-monitor-jumping-to-100-or-reporting-a-high-soc-when-the-volts-are-low-and-or-the-bms-has-disconnected/88