As I prepare for my summer pv build I've measured the orientation of my house and found the roof where the panels will be mounted (probably 6) faces about 15 deg east of solar south. How much of a loss in performance can I expect if I don't correct the orientation of the panels? It seems that most of the makers of quality panels tout their glass as being forgiving to off angle light, but I have no idea how much off angle light they capture.
Changing the orientation of the entire rack is not an option, but adjusting each panel individually might be o.k, if it doesn't make things too complicated - I don't remember ever seeing this on commercial installs. Of course buying one more panel might prove to be the easiest, and possibly cheapest solution. Any thoughts will be greatly appreciated.
Pete