Indoor and Outdoor Test Results for 'DUSST', a Low-Cost, Low-Maintenance PV Soiling Sensor

Matthew Muller, Joshua Morse, Leonardo Micheli, Eduardo Fernandez, Florencia Almonacid

Research output: Contribution to conferencePaper

4 Scopus Citations


Soiling can cause significant losses to photovoltaic systems, and therefore it is often measured for the purposes of predicting long-term energy forecasts or for monitoring real time performance and triggering maintenance events as needed. Currently, the most common soiling monitoring technologies are soiling stations that use the electrical outputs of a regularly cleaned PV device and of a naturally soiled PV device to quantify soiling. As part of a new class of low-cost and low-maintenance soiling stations NREL has previously presented 'DUSST'. DUSST projects a collimated monochromatic light source through a glass surface (exposed similarly to the PV modules that need to be monitored) and on to a light detector to measure the intensity of the transmitted light. As the glass surface naturally soils, the losses are quantified by comparing this soiled reading with a calibrated reading under baseline clean condition. This work presents the ongoing improvement of DUSST and the ongoing indoor and outdoor validation of this new soiling sensor.
Original languageAmerican English
Number of pages4
StatePublished - 2020
Event2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, Illinois
Duration: 16 Jun 201921 Jun 2019


Conference2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)
CityChicago, Illinois

NREL Publication Number

  • NREL/CP-5K00-73204


  • dust
  • optical sensor
  • photovoltaic device
  • soiling sensors


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