Battery bank problems
Our batteries rapidly loose storage capacity. We have a Xantrex xw6048 inverter and 2 charge controllers and a 48volt system. A new set of outback AGM batteries were installed along with a 15kw generator. The batteries rapidly weakened and the installer said we had a defective battery but outback disagreed and wouldn’t honor the warranty. We were able to enroll in a farm program that paid for most of a new set of batteries. This new installer said the problem was the six string parallel set up with four 12 v batteries in series. His four lead acid batteries (900AH) were 12 volt in series. Now these are 6 months old and they are rapidly weakening. On a sunny day with minimal load or with the generator we can only get a maximum SOC of 1.21. We wonder if there is some problem withthe generator or the inverter that is ruining the batteries.can anyone suggest how to diagnose the problem?