My next door neighbour has just installed 50, very little spare room on the flat roof of his quite subsantial house, likely 25 squares.
And the individual panels are 1KW panels too.
That bugger doesnt do things by halves.
Varys with the panel.
It isnt that hard to do a synchronised inverter.
Not clear if you mean a physical switch, obviously a relay etc.
There doesnt have to be a physical switch in that sense.
Depends on the environment. We can get some very spectacular dust storms so yes, you do need to clean them after that if you dont want to wait for the next rain to clean them.
Anything from a hose to a proper pressure washer.
Ours do. We mostly have evaporative coolers on the roof and the water works fine with them.
Nope. They dont add much to the weight of a tiled roof and the strength of the timber used for a flat metal roof is determined by the wind loading, not the weight of the roof with a metal decking roof.
With a flat roof, there is a metal rail structure used to angle the panels properly. Thats just srewed to the roof structure with what we call tek screws.
With a tiled roof, there are still metal rails that the panels are mounted on and those are attached to the roof stucture in a similar way. Most of those panels are at the same slope as the tile, although strictly speaking its better to angle them up more than that.
There is also another massive great system that I walk past for exercise, out on the edge of town. Two great big square arrays that must be about 7x7 panels each tho I havent counted them. Each is on its own great steel column and each array tracks the sun right thru the day. Quite impressive to watch it start up at sunrise and shut down at sunset.