hi need some input or ccts or someone that has knowledge re repair of charger

i have a victron centaur 12/40 charger which i use to charge lead acid batteries at a remote site I use a gen during the day sometime if not using gen i will connect up to 6 240w solar panels 190vdc to charge batteries when gen not used has worked good for some years unfortunately last person on site left solar panels connected to batteries as the start forthis charger is 90v dc it pulses to start till good solar input unfortunately it now only appears to run in float mode not charge when batteries are down 10.8v .
if on solar or gen it only charges at about 5 amps according to meter on front meter
cheers mark