375 AH wired, deep cycle battery bank and charger

Bought in 2018 installed in a converted cargo van. 3 stark 12 volt absorbed glass mat 125 amp hour batteries wired in series to produce 375 amp hours at 12 volts. Currently wired into a pro mariner triple battery charger . Saw light duty use in van for lighting, laptop, & speaker in the van while camping . New cost for all approx 1240.00 ( not including tax) = battery 300.00 each =900 , charger 340.00. asking $ 800.00 . Everything works fine , system is overkill for my needs. Wire in inverter , solar panel and solar charger of your choice , plug in charger to genset and your set up. please text . 807 -633-3981 thank you !