Solar reg question

[megatexture]

I was thinking of putting my Redarc Solar Regulator in a similar Project Box with a clear Lid however I am concerned that it will get quite Hot inside the Box.

Does anyone have any ideas about the Heat

PS
Just checked the Manual for the Redarc Regulator and it operates up to 55 Degrees C and then swithes itself off.

My box has two latches and hinges on it so its only closed when it has to be but your reg should be at the batteries so it's not hard to keep it in the shade