Going off-grid is really expensive unless you're willing to make significant quality of life cuts when you go outside your system capacity. A string of overcast days that only produce 50% of normal, or a series of hot or cold days that drive large A/C or Heat Pump usage can put you in a situation where you are shedding load during the day so you can bridge across the overnight period.

I expect it's just probably doable in a really temperate climate like SF, where you can live without running heating or cooling year-round and try to get your other electric usage way down, but anywhere with hot summers or cold winters is going to risk battery depletion.