I have the Multiplus 24/2000 with MPPT 100/50 and 6 panels on the roof. Two new lead batteries each 280Ah. If I let the charger run at 6 pm, switch to the inverter mode after 14 hours, in completely bad weather, the BMV switches after about 8 hours (load was about 11A) (V <24.4) the multi with his relay in the network operation. Then the charge state is at 90%. With an acid siphon, I also notice after fully charging that the batteries are not full at all. I have 32qmm cable between battery and Multiplus. What's wrong?