I have 2 x 115 AH banner batteries,about 3 years old.I also have 2 x 100 watt solar panels fitted.In summer everything works fine,obviously thanks mainly to the panels.However in winter I always struggle.On Friday we went with both batteries fully charged.After a couple of hours with very little turned on(All lighting LED)I was down to 12.3 Volta according to the IManager display.Are the batteries at fault do you think.After 3 years are they ready to be replaced?If so can anyone recommend a better alternative type,make size etc.I seem to spend most of my time monitoring the voltage!The boss wants to know why she can't watch TV without me moaning!Any help or advice appreciated.