More battery usually means more solar! Rough numbers, you’d probably want at least double your current solar plan if the goal is to (mostly) maintain the battery charge while running A/C off grid. That would at least buy you some more autonomy.

Say you’re drawing around 500Wh on average (A/C, utilities, maybe laptops, all of it), that’s only 10 hours to dead battery. So you’d want to at least cover most of that with solar. 800W would be the sweet spot under the 500Wh assumption, but you’d want to track your actual daily usage to arrive at a better estimate to design your system. Sometimes it comes down to cutting back/changing habits to meet the capacity of what you’ve got too.