I have an old golfcart, put 3 flexible 120w 18v panels on the roof, wired in series. Total weight including wiring about 15 lb. Wired it to a standard solar controller and hooked that to the battery. Have not plugged it into the charger for about a year.
Now I never go more than say 5 miles in...
What I did, was the same install, (the 14-50 outlet, with honking #4 wire) but I put a 30-amp breaker in the box, and I have a progarmmable EVSE, which I set to 26 - 28 amps.
I probably didnt need the huge wires, but it was about a 40-foot run.
It has charged my daughters Model-3 couple...
agree about the rating requirement, but I read it the other way around. How many watt-hours to go 1 mile? My Arcimoto (wierd electric 3-wheeler) is a bit over 200, so a KwH takes it about 4-miles-ish, half that at 80mph.
I think some smart folk can get a 4-wheel, 2-door sedan into that...