Today we swapped out three 90Ah 12 Volt VE batteries (270 amps) for a single 5120 watt EG4 12 volt (400 amp) battery and the Multiplus 3000 (not a Multiplus II) shows a low batt red light illuminated and will not charge the new battery. Why? We bypassed the VE Battery Protect and that made no difference. Oddly, the VE Solar MPPT controller will send a charge to it but the Multiplus will NOT. What am I doing wrong?