As for solar panels- 17% (typical solar panel efficiency) x 1000 W/m2 (typical sun effect)= 170 W/m2. To charge a 135 kW/h Rivian with 1 sqm panel you'll need 7

As for solar panels- 17% (typical solar panel efficiency) x 1000 W/m2 (typical sun effect)= 170 W/m2. To charge a 135 kW/h Rivian with 1 sqm panel you'll need 794 hours of light (it's not accurate, but gives a good estimate), so you'll need a lot of those to be effective.