Hybrid grid solar arrays are tougher than they seem

So I have a 20KW solar array. Love it.  But it has one big problem for me that is surprisingly hard/expensive to solve: If the grid power goes off, so does the solar array.

That’s because the solar array feeds into the grid with me taking what I need first.  But if the grid isn’t up, the solar array has to shut down because it is no longer connected to the “circuit”.  Besides that, you wouldn’t want to run your house where the power could go on and off randomly based on cloud...