I'm guessing nobody usually does this but I'm intending "shading" the installed 3 panels temporarily when done with a "99%" solar reflective blanket(s). Probably secured with bungee cords. This so the unfilled panels don't overheat. The idea being I can finish the roof side pretty much, have all the tubes up there, fitted and safely out of the way. Then concentrate on inside the loft which is another mission. I'll fill the system later on.