Positioning the Solar Panels on the right side of your roof will make a huge difference to your output!
The position of the solar panel differs for each installation and depends on your roof space and orientation to the sun. Panels are positioned so the sun hits them at a perpendicular angle (90 degrees) which maximises the energy being produced.
The two main factors that the angle is controlled by is position (North/South/East/West) and the degree the panels is from the earth to the sun.
Installing on a flat roof: The installation of a roof mounting system is installed to angle the solar panels at an adequate position to ensure maximum collection of energy from the sun.
Tilting primarily involves the angle that the panel faces the sun. On a flat roof the tilt is 0 degrees and if the panel was placed on a wall it would be 90 degrees. The minimum tilt on a flat roof is 10 degrees and considerations such as excess build up of dust and dirt on the panels needs to be considered and regular cleaning is recommended.
The Your Home Technical Manual offers some advice regarding this: