I plan on charging in a metal barn/garage where I store my cars/trucks and wonder what sized system others may have used just for a EV. Already have a 50Amp set up on “city” power and 50KW back up generator but Solar has me interested also.

I realize many variables such as how often I might charge, amount needed to fill the battery to 80% and amount of sunlight etc., etc….

I have no personal experience but I have noticed some local entrepreneurs here in my city are offering this kind of 'solar-hybrid' system for sale.
Some key figures of this setup:-
-four 2m x 1m panels, each 350W
-can output 3-phase 13A
-minimum 9kW battery for storage
-system connected to local power grid, thus any excess power will be sold back to recover the cost of the system (if your local utility company has this arrangement)

Pics are for reference. Use your favourite translator if needed.
https://unwire.hk/2020/07/20/solar-h...ife-tech/auto/