Yes, but in firefighting, a lot of the time we are up on the roof, cutting holes in the attic to let heat out of the building. The invertor will shutdown power

Yes, but in firefighting, a lot of the time we are up on the roof, cutting holes in the attic to let heat out of the building. The invertor will shutdown power to the inside of the building, but the line from the solar panel to the invertor is still hot. That line can be cut through as in a lot of installs it can be run through the attic. This line is never discharged but is always hot. As well as all of the lines between the panels. These can ground out in the building and cause electrical charge in objects that would be 'off' if it was a traditional power hookup that all power to the building can be shutoff from cutting the power grid building service. If one of those lines is cut, and a firefighter sticks a pike pole into the attic and touches that wire it could electrocute him just as readily as if the building was still energized by the power grid.