I'm not so sure about your claim. My small 2300 sqft home uses 60-100kwh per day with my Tesla charging mostly at home.
If I get 75% max of my ~3000sqft roof as active tiles, maybe I get a 15kw system? Since the area I live in (SWFL) gets about 6 hours a day of good strong sunlight, then 15 x 5 = 89kwh if I did that right. So MOST days it could produce enough. Now, my wife wants a Model Y (or X) next year. If we had 2 cars charging, no way the solar roof could generate enough without using grid energy.