标准对光伏模组设计的影响pvmrw2011_12_plen_wohlgemuth.pdf

How Standards Control Module Design for Better or Worse 2011 PV Module Reliability Workshop John Wohlgemuth, February 16, 2011 NREL/PR-5200-51007 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. Introduction •PV Modules should be designed and constructed to perform in a safe manner outdoor for at least 20 or 25 years. •However, it appears that many modules are designed and their components are selected primarily to meet the requirements of the Performance Standards (IEC 61215 and IEC 61646) and Safety Standards (IEC 61730 and UL 1703). •This presentation will explore the issues related to designing and building modules to meet standards rather than to survive in the field. NATIONAL RENEWABLE ENERGY LABORATORY 2 Why I believe Modules are Designed for Standards •Too many cases where modules pass one of the tests from the qualification sequence but fail when the test is extended even a small amount. •One case where new manufacturer’s cells in standard package passed 1000 hours of damp heat with little power loss, but just extending to 1250 hours resulted in significant power loss 20%. • While at BP Solar we tested 10 crystalline silicon module types from 9 different manufacturers from all over the world, all qualified to IEC 61215. • Only 3 passed BP Solar’s extended test protocol. • Most failed damp heat at 1250 hours. NATIONAL RENEWABLE ENERGY LABORATORY 3 Extending Test Dura