Soiling Measurement • Compare clean and soiled references cells • Automatic washing of clean reference cell • No maintenance required with automatically washed reference cells via water spray • 3-6 month capacity between water refills Standalone Product Smart Pump System Automatically washes at optimal time of day System alerts when it is out of water Can be installed at preconstruction sites or operating PV power plants Direct connection to data logger or plant SCADA system

Reference Cell Pair Water Tank, Pump System, and Controller Mount underneath PV Array Connect to user power and SCADA Specifications Soiling Measurement Power/Comm Compares soiled • Cell-Cell reference cell to • Main/AUX Cables clean reference cell Power Communication • Input Voltage 18-30 VDC • Physical Layer RS485 • Nominal Power 1-6 W (**) • Protocol Modbus RTU **Typically <2 W. Draws up to 6 W after completing a wash • Baud Rates 9600, 19200, 38400, 57600 Default Washing RC22 Reference Cells Torque tube or fixed tilt. • Water Capacity 3-6 months • Mounting Mounting plate 15" x 2.56" • Duration...