Your roof does not be facing due north in order for a solar power system to perform well. For example, at a roof orientation of direct west, the electricity production loss is approximately 12%, depending on roof inclination. Adding just two extra solar panels to a West facing system would increase electricity production to a slightly higher level than a North facing solar power system with two solar panels less. So, although it's beneficial to have a north facing roof, it is not essential.
FAQ > Installation Process
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