Tesla car battery has about 6000 li-ion batteries. Each rated 3.7 V and 3500 mAh.
I asume ten 1m2 solar panel, each gives 150 W at 12 V (this gives about 12.5 A). For this problem, I put them in parallel, so together they give 1500 W, 12 V and 125 A.
The li-ion batteries will be in 3s, so they will behave like 2000 batteries in parallel, each 3s group will have 12 V (aprox.), and 3500 mAh capacity.
The total capacity of the battery group is 2000 cells x 3500 mAh = 7 ∗ 10^6 mAh = 7000 Ah. The time the solar array needs to charge the batteries is: 7000 Ah / 125 A= 56h of good sunlight.
In a sunny location, lets say that you have 8h of good sunlight per day, so 56h / 8h/day = 7 days to charge the battery.
Have I missed something important? This is not homework, just curiosity. I think the solar panels are not really used in parallel because taking 125 A from them seems like a bad idea (very hot and melts everything). What else?