Reasonable array size for 600aH battery bank
I've got 3 banks of UB-GC2 6V 100 aH batteries, wired in series for 48 V and tied to a copper buss bar. 12 SW260 panels are wired as 4 sets of three and are connected to an Outback 8048 Radian with an FM80 charge controller. Each string should produce 780w at 94vdc, for a total of 3210 watts. With a nominal load of .6 to 1.2 kW, does this seem like enough panels to get a proper charge? I'm in Northern AZ, getting some 5.5 hours of sun. I can only add one more string before I need another charge controller, and I wonder if that is worth the install effort.