It's a bit of a problem, and one shared by typical solar panel installations.
However, a development at Boyland Hall, in Norfolk, has got around that problem by being the first UK customer of a German tracking system which uses GPS technology to track the sun.
Remember that scene from the 'Bond film - The Man with the Golden Gun? This system couples GPS technology with astronomical calculations to always be facing the sun.
The result is a 9kW system which generates 45% more electricity than a fixed position system.
Now that is a figure to make heads (and solar panels) turn isn't it?
photo credit: paul stevenson