Solar Module Makers Face Backlash Over Inaccurate Power Ratings
Solar module manufacturers are facing criticism for inaccurate power ratings, leading to significant underperformance. In 2024, an average shortfall of 1.2 percent in 16.2 gigawatts of newly installed capacity resulted in a total performance loss of about 195 megawatts.
The issue of manufacturers overstating their modules' power output is escalating. In 2024, two-thirds of tested movies performed below their claimed ratings, according to TÜV Rheinland. This trend is not new; since 2016, the average underperformance has been around 1.3 percent, as reported by the Fraunhofer ISE. The situation has worsened in recent years due to stricter testing standards and the introduction of new technologies, with the average deviation now at -1.3 percent.
Both the Fraunhofer ISE and TÜV Rheinland have confirmed these findings. The increasing variability in module technologies and manufacturing processes has led to more frequent deviations from manufacturers' claims.
The solar industry must address the growing issue of inaccurate power ratings. Continuous and independent quality control, especially for imported movies which account for over 90 percent of the market, is crucial to ensure the reliability and efficiency of solar power systems.
