G'day Bob...
So how are you charging the bank ?
What configeration do you have there ?
4 x 115Ah/12v in parallel = 460 Ah/12V
4 x 115Ah/12v in series = 115Ah / 48v
2 x (2x 115Ah/12v in parallel =230Ah/12v) in series = 230Ah/24V
Love Solar off grid ....