I thought there were shutoff devices that could detect a grid outage and instantly disconnect your home from the grid allowing your inverter to power your house until grid power is restored. I assumed something like this would be $10K but well worth it, as basically the whole point of battery-backed solar is energy independence.
From the article, the problem isn't the transfer switch but that the microinverters used on most systems don't work without the grid. If the grid goes down or is disconnected, the microinverters stop providing power.
It is possible to get inverter that will work independently, and batteries to buffer the load, but the off-grid system is a lot more expensive than normal rooftop solar system.
