Average sunlight/day 7 hours in Asheville NC in October. So, 120x2x7= 1680W/12= 140Ah for the day.... Or, 120x2/12= 20A/hr * 7 hours is 140Ah
HOWEVER.... what quality panels, how old, what efficiency, how clean, how well oriented? In other words how many of those 120W it says on the box do you actually get?
So the real answer is: "No way to tell from here". Anywhere from 10-20/hr so 70-140Ah/day is my guess.....