The US uses ~0.5 TW of electricity on average but to go 100% solar you would need ~3 TW of solar capacity (6X average usage) and ~30 TWh of battery storage, maybe lots more, plus a massive upgrade to the grid.

Can you share where those numbers are from? I'd like to run a similar calculation on my own country.

Also I'm curious if you know how geography fits into this (like sunlight hours and stuff).