A-level components: mainly used in ground power stations, distributed power stations, household systems, etc., with a life span of more than 25 years. Solar panels are graded into categories A, B, C, and D based on their quality, and the cost differences between these grades can be significant. Grade A panels, for instance, are the highest quality, while Grade D panels are typically considered low-grade materials with limited usability. What. Terms like Grade A, B, and C are often used in the industry — but what do they actually mean? And how do they impact the performance, reliability, and return on your investment? At Sova Solar, where we've been manufacturing high-efficiency panels since 2008, we believe it's time to shed light on. The expensive monocrystalline panels vs. the cheaper polycrystalline or the easy-to-install thin-film solar panel may be the best for your needs. The cost gap is also very large. So what kind of solar panel is called A grade, and what kind of solar panel is called D grade? Here is a brief. Differences between Class A and Class B photovoltaic panels: Color: The color within a group of Class A panels is consistent, while Class B panels are allowed to have slight color differences within the same group.