A HVDC cable from Sahara to America would loose 50% of power, but still would charge your car overnight. As solar install itself is around 50% of it's cost, it's probably cheaper to do so in a dessert than over your house.
https://caseyhandmer.wordpress.com/2020/12/27/the-future-of-...
Use a huge excess of solar power to generate hydrogen, transport hydrogen via oceans to ports, store it and convert it back to electricity locally when needed.