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Progress Update

Sensors and Monitoring

Task Group 12-1 focuses on issues related to sensors and the monitoring of soiling. The group contributed to the International Electrotechnical Commission (IEC) standard IEC 61724-1:2017, which defines and specifies methods for quantifying the effect of soiling on PV systems. There is an interest in an interlaboratory study of the precision of new and old soiling sensor technologies.


To receive communications related to the Task Group 12-1 sensors and monitoring effort, contact YuePeng Deng.

Cleaning Solutions

Task Group 12-2  focuses on cleaning solutions for  soiling and accumulated contamination. Specific topics include developing the scientific basis for qualifying different cleaning methods (e.g., cleaning solutions, hand cleaning, and robotic cleaning), and identification of the issues that need to be included in the techno-economic analysis required for cost-effective cleaning.


To receive communications related to the Task Group 12-2 cleaning solutions effort, contact Lin Simpson.

Anti-Reflective and Anti-Soiling Coatings

Task Group 12-3 focuses on antireflective and/or anti-soiling coatings. The group has recently focused on PV-first surface (e.g., glass) abrasions that may result from the natural environment or the cleaning and removal of contamination. The group aims to generate a PV industry-specific standard related to abrasion. The IEC 62788-7-3 standard under development may have overlap with abrasion of backsheets, as well as vehicle-integrated PV.

Publications and Presentations

Review of Artificial Abrasion Test Methods for PV Module Technology 
Authors: Miller, D. C., Muller, M. T., Simpson, L. J.
Technical Report: NREL/TP

Evaluation of Soiling and Potential Mitigation Approaches on Photovoltaic Glass
Authors: Einhorn, A., Micheli, L., Miller, D. C., Simpson, L. J., Moutinho, H. R., To, B., Lanaghan, C., Muller, M. T., Toth, S., John, J. J., Warade, S., Kottantharayil, A., and Engtrakul, C.
Journal: IEEE Journal of Photovoltaics

Soiling and Cleaning: Initial Observations from 5-Year Photovoltaic Glass Coating Durability Study
Authors: Toth, S., Muller, M., Miller, D. C., Moutinho, H., To, B., Micheli, L., Linger, J., Engtrakul, C., Einhorn, A., and Simpson, L.
Journal: Solar Energy Materials and Solar Cells

Soiling Related Abrasion and the Development of a PV Abrasion Standard  
Authors: Miller, D. C., Einhorn, A., Engtrakul, C., Lanaghan, C. L., Micheli, L., Moutinho, H. R., Muller, M. T., To, B., Toth, S., and Simpson, L. J.
Workshop: International Soiling Workshop


To receive communications related to Task Group 12-3  and IEC 62788-7-3 standard efforts, contact David Miller.

Modeling and Analysis

Task Group 12-4 focuses on modeling and analyzing the effects of soiling on PV systems. For example, the group is developing methods to determine soiling loss from the power production data from PV installations. Additionally, the group hopes to identify models that predict typical soiling losses at sites locations throughout the world.

Publications and Presentations

A Scalable Method for Extracting Soiling Rates from PV Production Data
Authors: Deceglie, M. G., Muller, M., Defreitas, Z., & Kurtz, S.
Conference: 2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

Quantifying Soiling Loss Directly from PV Yield
Authors: Deceglie, M. G., Micheli, L., & Muller, M.
Journal: IEEE Journal of Photovoltaics


To receive communications related to the Task Group 12-4 modeling and analysis effort, contact Leonardo Micheli.

Quarterly Webinars

Task Group 12 shares information regarding a variety of topics relevant to soiling through quarterly webinars.  These webinars  exchange relevant information, facilitate networking, and aid research, development, and standards related to soiling in PV modules and systems. Past webinar topics have included: coating technologies for PV; economics of soiling loss and cleaning; soiling monitoring, aerosol, and particulate matter  assessment networks; soiling in challenging locations (presentation and panel discussion); typical field conditions like wind velocity and momentum/energy of dust storms; health and human safety and dust storms; standards needed for the industry; modeling the effect of soiling on systems; and artificial soiling methods for repeatable laboratory tests.


If you’re interested in presenting a webinar,  contact Greg Smestad, Sol Ideas Technology Development.

If you’d like to receive communications about the Task Group 12 webinars,  contact Russ Jones KACARE.

If you’d like access to webinar recordings and materials on the PB Works website,   contact David Miller, National Renewable Energy Laboratory (NREL) .

Annual International Soiling Workshop

An annual international soiling workshop has been hosted in autumn in past years.  To access archived workshop presentations,   see the PB Works website.

For general questions about the workshop, contact Lin Simpson, NREL.

Task Leaders

YuePeng Deng, First Solar
Mike Van Iseghem, Électricité de France
Leonardo Micheli, Universidad de Jaén
David Miller, NREL
Lin Simpson, NREL

Other leaders and initiatives are welcome.