@AC Re: Tesla's progress is amazing
Joking aside, that is the exact situation I'm wondering about - just how many solar panels do you need to install to charge a Tesla from empty in one night? It would be an interesting metric.
Very roughly... Tesla is 100KWh, you never run them to zilch so I'm going to assume when you've used 70% of that the car is 'flat' (the reason for this choice will become clear in a moment). There are charging losses and I'm going to use 10% as a number plucked out of thin air. Therefore your source needs to deliver 77KWh to recharge your Tesla.
The most appropriate source for overnight charging is obviously a, or rather several, PowerWalls. These are 10KWH boilerplate but to get any reasonable life out of them you need to use no more than 7KWh (the above is clear now I hope). Therefore you need 11 PowerWalls.
Each PowerWall needs charging and again assuming 10% loss the source for that needs to deliver 7.7KWh. The first link below says a typical solar panel can deliver about 400Wh per average day. Rounding up for easy numbers that's 20 panels per PowerWall and 220 panels per Tesla.
That's pretty obviously beyond the size of most rooftops so I'll assume installation in a field. The panel in the second link is 670x1015mm, call it a meter square, double it to allow row spacing and you need an area 21 meters per side in the US, at a guess double that in the southern England or in Scotland, Scotland.