In the northern hemisphere solar panel orientation is seen by some as unsuitable because they mainly lie on a north-south axis. This enables them to generate the most electricity when the sun is at its zenith (highest in the sky) and is shining straight down (or as near to perpendicular as possible) on the surface of tilted panels.
This orientation allows panels to generate the greatest possible amount of electricity during the middle of the day. However this is not the best time of day to generate. This is because there are problems connecting intermittent sources of electricity, such as solar panels, to the grid.
Apparently, midday electricity isn’t required so much as afternoon electricity. (I’m not sure what is required in the morning.)
More Info on Northern Hemisphere Solar Panel Orientation
Find out more detail about northern hemisphere solar panels pointing the wrong way in this article from The Telegraph.