How many solar panels to charge a Tesla?

If a Tesla last for 300.000km and have an average consumption of 0,2kWh/km, you will need 60.000kWh in total. Let us also assume you keep the car for 25 years which is also how long most solar panels is expected to last.

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In sunny California (capacity factor of 25%) you will need 4 solar panels a 270Watt to produce 60.000kWh over the solar panels 25 year life span! The catch is that you will be limited to 12.000km a year and a maximum daily range of 50km. Great if you like to park the car in the garage during day, and enjoy a joyride in the evening!
In a less sunny place such as Germany you will need 8 solar panels. On the bright side, this result in twice as much energy on a sunny day meaning a daily range of up to 100km.

To be noted: Having solar panels exclusive for car charging is a stupid. All solar panels should be connected to the electricity grid so that electric cars can be charged up to 100% on sunny days. #loadshifting