A common question is, “Will my solar panels still give me power under blackout conditions?” “Not without a battery storage device, and not all storage devices can offer a standalone backup service”, is my general response.
A PV system doesn’t know if workmen are working at the end of the road, so they’re designed to prevent output under blackout conditions. Some battery storage devices can create a closed loop in the home, thus converting to an off-grid system on demand, but not all.