Why would the SmartSolar or Multiplus of the 5kW Easy Solar, change the 48V bus voltage when the inverter limits its inverting output to 5kW or less (the dip is normaly due to temperature degrading)
The voltage is shown at the bttom left - it jumps from ~52.4 to 52.8V for the limiting period.
The graph bottom right indicates it is not the BMS and batteries (PythonTech 3000s)