Core Insights - The article discusses the growing demand for solar panels in the U.S. market and the importance of UL1703 certification for Chinese solar panel manufacturers to successfully enter this market [1] Group 1: UL1703 Certification Overview - UL1703 is a safety standard for flat-plate solar photovoltaic modules and panels, applicable in extreme environments such as heavy snow and high winds [1] - The standard aims to reduce risks and ensure that important design features meet safety requirements consistently [1] - UL1703 has been replaced by the international standard UL 61730, which includes design requirements and testing methods for photovoltaic modules [1][3] Group 2: Key Testing Requirements - The UL1703 standard emphasizes "extreme environmental resistance" and "long-term reliability," with testing requirements exceeding those of the IEC 61215 standard, particularly in fire safety and mechanical strength [3] - Key tests include: - Fire safety tests for rooftop installations [4] - Electrical performance and safety tests [4] - Mechanical load tests simulating extreme weather conditions [4] - Environmental durability tests validating a 25-year lifespan [4] - Special tests for bifacial modules [4] - Material safety verification [4] - Junction box and connector testing [4] - Compliance with labeling and instruction manual requirements [4] Group 3: Specific Testing Criteria - Fire tests include horizontal and edge burning tests, with specific flame spread and penetration criteria [5] - Mechanical load tests require components to withstand pressures equivalent to 1.5 meters of snow and cycling loads without deformation [5] - Environmental tests include high humidity and UV aging tests, ensuring minimal power degradation [5] - Bifacial gain testing must demonstrate stable performance over time, with examples of successful products like Yingli's "Panda" module [5] Group 4: Certification Process - The certification process involves confirming testing standards, submitting samples, and completing application forms [6] - Testing typically takes 5-7 business days, with options for expedited processing [7] - Upon successful testing, a draft report is issued for confirmation before the final report is released [7]