Hello I am in need of some help . I bought this cabin that they are using an xantrex dr2412 invertor charger with older pannels 4 @ 100 watts each to a battery bank of 8 crown deep cycle 6volts wire to 12v . well the invertor went out so I bought a 3000w from aims power and hooked it up. Well now it seems that rather my pannels or batteries are not doing well and I’m not sure we’re to go from here. It will not fully charge to 100% an one of the Solar pannels is all black . The system is over 20 years old . Any recommendations on pannels an batteries ? Should I add pannels first an go from there ? The batteries do not look that old an were barely used.? Need all the help I can get lol . Will send pics if needed .