Therefore, even though arranging solar panels horizontally might seem like it makes more shade, it actually blocks less sunlight and produces more power compared to the vertical setup. Horizontal means that the long side of the solar module is parallel to the east-west direction, while vertical means that the short side is parallel to the east-west direction. Whether to use. In residential and commercial photovoltaic projects, the orientation of PV modules is far more than a simple installation choice — it affects system efficiency, drainage performance, aesthetics, and maintenance requirements. As photovoltaic systems become more diverse and decentralised, rooftops. This guide breaks down technical specifications, layout optimization tips, and real-world applications to help you achieve 15-20% higher energy yields in commercial solar projects. The two most common orientations are: 1.