This guide covers everything you need to know about solar roof panels — including costs, brands, installation tips, and how to make the most of your investment. 3% efficiency compared to older P-type cells at 17. This shift provides better performance, lower degradation rates, and. . The engineering behind the HQST 200W Monocrystalline Solar Panel, 25% Efficiency, IP65 represents a genuine breakthrough because it combines high efficiency with durability—perfect for rooftop use. Unlike traditional rooftop panels, these solutions integrate directly into the roof itself, offering a seamless appearance while delivering renewable power.