Hybrid inverters have auto shutoff (islanding I think?) so you can merge the grid power with your solar power and there is no difference when the grid is down.

Hybrid inverters have auto shutoff (islanding I think?) so you can merge the grid power with your solar power and there is no difference when the grid is down. Off the shelf, installed, and magically works. It acts as a glorified whole house UPS. Solar is one of those areas where there is a lot of bad info floating around promoted by installers and certain manufacturers (ahem Victron).