Search documents

Browse topics

Document details

Performance and Reliability of Modules with Anti-Reflective Coated Glass
G. Bunea, G. Xavier, D. Rose, L. Nelson, J. Peurach
Anti-Reflection Coating, Back Contact, Crystalline, Module, Energy Performance
Components for PV Systems
Subtopic: PV Modules
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 4AV.3.44
4103 - 4106
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-4AV.3.44
0,00 EUR
Document(s): paper


Anti-reflection coated (ARC) glass is being used in an increasing percentage of PV modules due to expected higher power and energy output. Assurance of the energy gain and the reliability of the coating is essential to create value. This paper reports on the steps taken to test, qualify, and release in production photovoltaic modules made with ARC glass. The work focuses on porous SiO2 coatings made by sol-gel process. The qualification and validation methodology used included 1) extensive accelerated testing for reliability and long-term performance based on tests identified using a Design Failure Mode and Effect Analysis (FMEA), 2) measurement of power gains over a large number of modules, and 3) side-by-side field testing including frequently-monitored, large-volume sites and experiments to identify sources of energy gain beyond the standard test conditions for power gain and validate the coating reliability. Our production results to date show that standard test condition (STC) flash power gain due to ARC glass is on average 2.7%. After more than three years of outdoor testing in various climates, the energy production gain from ARC glass modules is 3.5-5% depending on the type of installation and location. The higher energy gain as compared to STC flash gain is due to improved coating gain in diffuse and off-angled light due to the effect of the refractive index and the light scattering within the coating. Two years of controlled side-by-side testing at National Renewable Energy Lab (NREL) shows that both uncoated and ARC coated modules increase in power, with modules with ARC increasing the most.