As you can see in the image below, when there is a sudden high load demand, the ESS system switches over and supplies the loads from the AC grid, not from the battery which at that time is sufficiently charged. At that time, a small voltage drop occurs on the battery side. Could it be due to a voltage drop on the battery cables, which are 12-13 meters long and 70mm?
The VE.Bus System is Quattro 48/15000/200-2x100.
The Solar charger is SmartSolar MPPT RS 450/200.