It would be great to open up a charging station that offers both FAST Direct DC charging and fast AC charging. But with a large station the stationary pack will need to be huge. Remember some of the proposed vehicles that will be filled have huge kWh requirements and it needs to be pumped in fast. My Leaf uses a 24 kWh pack. My Bug a 19.2 kWh pack. My solar panels put out a good 48 kWh daily. What would happen if I had a Tesla S with an 85 kWh pack. I could not charge that in a day with only solar panels unless I had a very large solar array. As it is I can charge not only my Leaf but my Bug as well. So if Tesla doe build some solar charge stations the size of the solar must be huge. It will require loads of space and it will create lots of shade.