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Automatic Soiling Sensor
SEVEN Soiling Sensor is designed to measure the loss of energy production due to soiling caused by environmental
factors on photovoltaic panels. The Soiling sensor, which is suitable for commercial, utility, industrial and rooftop projects,
notifies the user of production losses due to soiling. If soiling ratio read from the sensor is 10%, it means that there is
10% energy loss in the facility.
DESCRIPTION
SEVEN Soiling Sensor calculates the soiling rate of the PV system by comparing the irradiance values received from
two clean and dirty irradiance sensors. While the dirty irradiance sensor in the system is exposed to soiling in the same
way as the panels, the clean irradiance sensor is automatically cleaned every day. Monitoring systems give the user the
energy loss by comparing the two irradiance values according to the data received from the cleaned and dirty irradiance
sensors.
TECHNICAL DATA
| Item Code | 3S-SMS-MB |
| Soiling Ratio | 0% – 100% |
| Resolution | 0,001 |
| Uncertainty | ≤1% |
| Irradiance | 0…1600 W/m² |
| Followed Standard | 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-5A option is available) |
| Power Consumption | 20 mA @ 24 V DC When the pump is active |
| 3 mA @ 24 V DC When the pump is active | |
| Electrical Connection | 3 m LIYYC11Y PUR Cable, UV and weather resistant |
| Galvanic Isolation | 1000 V between power supply and RS485 Bus |
| IP Rating | IP 65 |
| Weight | 10.5 kg |
| Calibration | Each sensor is calibrated and normalized under Class AAA Sun Similator as per IEC 60904-2 by using a reference cell calibrated by ISFH-Germany |
| Test | Each sensor is tested under natural sunlight by using a calibrated reference cell from Fraunhofer ISE, Germany.) |
| Water Tank Capacity | 18 Liter |
| Cater Consumption | 36lt/year (2 times filling per year) |
| Cleaning Fluid | 100% Pure Water when the ambient temperature is above 0°C |
| 65% Pure Water + 35% Antifreeze when the ambient temperature is below 0°C | |
| Max. Water Line Length | 20 Meter |
| Max. Water Line Height | 5 Meter |
The system consumes approx. 100 mililiter water for single run for 2,5 meters water hose length. The water tank is able to serve 400 days (13.3 months). Consult SEVEN if the water hose longer than 2,5 meters.