What you lose with Erthos' approach is any possibility of using bifacial panels. In regions that get snow, bifacial panels (that use light reflected onto the b

What you lose with Erthos' approach is any possibility of using bifacial panels. In regions that get snow, bifacial panels (that use light reflected onto the back of the panels as well as light from the front) get a lot better output in the winter, increasing the annual capacity factor and therefor return on investment. (Winter electricity can be more valuable too, in those regions.) Horses for courses.