My setup consist of 6 X 100 A 12 V Battleborn batteries with multiplus 120/ 3000 .Color Control GX shows battery bank 100% full and battery voltage 12.5 V .Every time I get Low Baterry Alarm when I turn on 110 V appliances . Color Control GX shows Battery bank is 98 % full battery voltage drops to 11.7 and Multiplus tuns off. Any suggestions?