Does that work?
Our solar inverter uses the 60hz AC from and grid to do the DC->AC conversion. The inverter stops functioning if the power is out. I thought they all did that for safety.
Those home batteries mush have some solution.
They don't all need the grid - https://news.ycombinator.com/item?id=44023226
https://eg4electronics.com/categories/inverters/eg4-18kpv-12...
They don't all need the grid - https://news.ycombinator.com/item?id=44023226
https://eg4electronics.com/categories/inverters/eg4-18kpv-12...