3S-SMS-MB Automatic Soiling Sensor for Photovoltaic Panels

Reference: 3S-SMS-MB
Brand: Seven Sensor

The soiling sensor is designed to measure the loss of energy production caused by dirt that environmental factors leave on photovoltaic panels. Suitable for commercial, utility, industrial and rooftop projects, it notifies the user of production losses due to soiling.

If the soiling index read by the sensor is 10%, it means there is a 10% energy loss in the installation.

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3S-SMS-MB

Torn between two models?

Overview

The sensor calculates the soiling rate of the PV system by comparing the irradiance values from two irradiance sensors, one clean and one soiled. While the soiled irradiance sensor is exposed to dirt in the same way as the panels, the clean irradiance sensor is cleaned automatically every day. From the data of both sensors, the monitoring system reports the energy loss to the user.

Technical data

Soiling rate: 0% – 100%
Resolution: 0.001
Uncertainty: ≤1%
Irradiance: 0…1600 W/m²
Standard followed: IEC61724-1 (Annex C)
Data output: RS485, up to 38400 baud
Communication protocol: Modbus RTU
Output rate: 1/s
Operating temperature range: -40°C to +85°C
Operating humidity range: 0 to 100% RH
Power supply: 220 VAC (24 VDC, 5 A option available)
Power consumption: 20 mA @ 24 VDC with the pump active; 3 mA @ 24 VDC with the pump inactive
Electrical connection: 3 m PUR LIYYC11Y cable, UV and weather resistant
Galvanic isolation: 1000 V between the power supply and the RS485 bus
IP rating: IP 65
Weight: 10.5 kg
Calibration: each sensor is calibrated and normalized in a class AAA solar simulator according to IEC 60904-2, using a reference cell calibrated by ISFH (Germany)
Testing: each sensor is tested under natural sunlight using a reference cell calibrated by Fraunhofer ISE (Germany)
Water tank capacity: 18 liters
Water consumption: 36 liters/year (2 refills per year)
Cleaning fluid: 100% pure water when the ambient temperature is above 0°C; 65% pure water + 35% antifreeze when it is below 0°C
Maximum water line length: 20 meters
Maximum water line height: 5 meters