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Soiling Measurement Kit

Quantify the site-specific impacts of soiling on prospective and current PV projects with NRG's Soiling Measurement Kit.

  • Soiling Measurement Kit
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Configuration Options

NRG’s Soiling Measurement Kit provides users with the information needed to quantify the site-specific impacts of soiling caused by snow, dust, and other particles on prospective and current PV projects. These data are used to improve pre-construction annual energy production (AEP) estimates as well as maintenance schedules (i.e., panel washing) and forecast models in the post-construction setting.

The Soiling Measurement Kit interfaces with the SymphoniePRO Data Logger via its interface module, which provides 0 V to 5 V (analog) signal outputs for the Isc CLEAN and Isc SOILED measurements. The interface module requires a single 12 V excitation (EXC) and ground connection (GND) available from any combination of built-in logger channels (16-19) and P-SCM channels (20-26).

Configurations of this kit exist both with and without P-SCMs depending on which data logger channels will be available and used for these measurements. When connected to P-SCM channels, the Isc output signals from the interface module require P-SCM item 9132, while the Soiling Measurement Kit's included temperature sensors for Temp CLEAN and Temp SOILED measurements can be connected directly to the logger's wiring panel and require P-SCM 9135 when used on P-SCM channels. 

• Determine site-specific soiling loss characteristics with this turnkey soiling measurement solution.
• Install easily as an accessory to NRG’s SRA System – complete with PV modules, pre-installed back-of-module temperature sensors, flexible mounting hardware, and integrated soiling interface module.
• Measure short circuit current and back-of-module temperature with user’s choice of statistical interval as well as optional 1 Hz sample data collection for flexible analysis options to meet data demands.

  • Three (3) 15W PV panels (data logger power, dirty panel, clean panel)
  • Two (2) back-of-module temperature sensors
  • One (1) interface module (in shelter box)
  • Two (2) x 9132 P-SCMs for Isc measurements (included in 11174 configuration)
  • Two (2) x 9135 P-SCMs for temperature measurements (included in 11174 configuration)
  • Related mounting and wiring components
  15 W PV Panels (#10690) 15 W PV Panels, with P-SCMs (#11174)
Sensor type Soiling Measurement Kit |15 Watt PV Panels n/a
Applications Soiling Loss Measurement n/a
Sensor range Soiling Ratio (*) Accuracy < 1%
( for Isc values>0.5 Amp including back of panel temperature error)
(*) Soiling ratio is calculated from measurement of short circuit current (Isc) of both a clean reference solar panel and uncleaned test solar panel, including back of panel temperature compensation
Instrument compatibility NRG Solar Resource Assessment System using SymphoniePRO Data Logger n/a
Measurement range Recommended Panel Isc Measurement Range for Soiling Ratio Calculation: 0.50 Amp to 1.5 Amp n/a
Output signal  
Signal type Analog voltage n/a
Power requirements  
Supply voltage Soiling station interface module: 5-15 Vdc n/a
Supply current Soiling station interface module and the amplifier power for the Isc measurement:Max 2.5mA n/a
  • Panels: Rail mounting with angle
  • Interface Module: DIN rail mount
  • Solar panel current measurement and back of panel temperature are connected via a 5 terminal screw connector on the interface module
  • The connections to the logger from the interface module are via a 6 terminal screw connector
Operating temperature range
  • PCB Temperature: -40C to +65C
  • Temp Probe and adhesion Temperature: -40C to +85C
Operating humidity range 0 to 100%
Corrosion resistant
UV resistant
Other IP Rating
  • Interface module: IP55 when installed in a standard Symphonie Shelter Box | FRP
EN 61000-4-2 ESD
Packaging meets ISTA-1A 2014 Shock Drop Test

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