Could go to 48 total but ? ( their is room ) That would be 26,880 Watt Hours at 24 volt. 26880 / 1200 = 22.4 hours to recharge ? If their was room on the roof for 8 x 300 watt panels (and their is not ) it would be 11.2 to recharge. And you add the SUN ? not being their,even longer. And $3600.
So I will start with 8 x 3.2 (6720 Watt Hours ) and go from their. 6720/1200 = 5.6 hours to recharge. Maybe one more set ? Total of 16.
= 13,440 watt hours. 13400 / 1200 = 11.16 hours to recharge
And losses and other parts for a big system.