No problem, I remember researching the available panels at the time and selecting the most efficient and playing panel Tetris to get the most possible on the roof.

In the end the installer did a last minute switch, but although the panels were not the best available they were pretty close. The most annoying thing was that the panels were slightly different dimensions and the installer insisted in wider margins around the panels so I ended up with several fewer panels overall, ruining my carefully planned layout.