This might be dead now, but Solis had a firmware issue where the inverter voltage detection went all to cock and loses its calibration. May need a FW update and adjustment in the settings.
That Duracell battery is A BYD battery in a pretty frock. It's only a out 3.3kWh but 100kg. It's a beast and outdated, the next gen is supposed to be good. The Social Energy stuff is a good though.