In the rapidly evolving photovoltaic (PV) industry, quality control of solar cells and modules is the cornerstone of stable power generation and long service life. Electroluminescence (EL) testing has become the most widely used non-destructive inspection method for identifying hidden defects in PV products, and Yoha Solar has long focused on the R&D and application of high-precision EL testing equipment, providing reliable quality control solutions for global PV manufacturers and operation teams. #EL Testing #PV Quality
Yoha Solar Panel EL+AOI Appearance Tester
EL testing relies on the core principle of semiconductor electroluminescence. When a forward bias voltage is applied to a crystalline silicon solar cell, excess carriers in the PN junction recombine and release near-infrared photons, which are captured by high-sensitivity industrial cameras to form a luminous image. Uniform luminescence indicates a qualified cell, while dark spots, streaks or uneven brightness reveal hidden defects such as micro-cracks, broken grid lines, cold solder joints and material impurities. This non-invasive detection method does not damage solar cells, making it indispensable for production line inspection and on-site PV module maintenance. #Solar Cell Defect #Non Destructive Test
Internal Defects of Solar Panel Detected by Yoha Solar's EL Tester
To achieve efficient and accurate EL detection, professional solar module EL detectors are essential. Backed by Yoha （Wuhan） New Energy Technology’s advanced manufacturing and R&D strength, Yoha Solar’s EL testing equipment boasts industry-leading verified parameters, perfectly matching global PV production and testing needs. The flagship YHEL series detectors feature 60-megapixel high-resolution industrial cameras, can detect micro-cracks as thin as 0.03mm, are equipped with 60V/10A regulated power supplies, and support adjustable image acquisition time. It adapts to 166mm, 182mm and 210mm large-size solar cells and full-size PV modules, with dual online/offline working modes to meet mass production and random inspection needs. #EL Equipment #PV Module
Yoha Solar's Solar Panel EL Tester for BIPV Module
EL testing fills the gap of traditional visual inspection in identifying invisible PV defects, and high-performance EL detectors are key to upgrading PV quality control. With professional technical configuration and stable operation performance, Yoha Solar’s EL testing equipment helps the global PV industry reduce defect leakage risks, improve product qualification rates, and lay a solid foundation for the healthy development of clean solar energy. As the PV industry continues to expand, advanced EL testing technology will remain a core support for improving product reliability and market competitiveness. #Solar Energy #PV Inspection