[itsrajju]

Not the parent.

It's likely a safety issue in the case of grid-connected solar installations. These panels are designed to send excess electricity to the grid, and if the grid is down, the utility needs to make sure that busted cables are not carrying electricity... for the safety of the repairmen.

https://www.cnet.com/home/energy-and-utilities/do-blackouts-...

[nibbleshifter]

Preventing backfeeding during an outage isn't a hard problem, technically speaking...

[zo1]

It's a default feature in grid tied inverters from what I've been told.