Not to mention the one that I always bring up to the sun worshippers that I have yet to hear a satisfactory answer for, that pesky old natural phenomenon called night.
It was mentioned...
Not much you can do if your primary energy source goes away for 50% of the time. Those nanotubes get their rest then, I suppose.
How about six times the solar capacity, combined with ten times the storage (battery) capacity, plus a backup soure for the third cloudy day?