Following meteo data will be received from Seven Solar Sensor Box and you will evaluate performance of your solar PV plant accordingly. Solar radiation reference cell (W/m2), module temperature (embedded inside radiation sensor), Wind speed (m/s) and Ambient temperature.
Irradiance sensor is an affordable solution for measurement of solar irradiance. The powder-coated aluminum case in conjunction with the solar cell laminated between glass and Tedlar foil builds a very reliable and rugged sensor.
MODE OF OPERATION
A silicon solar cell can be used as an irradiance sensor, because the short-circuit current is proportional to irradiance. Our sensors are built out of a monocrystalline solar cell connected to a shunt. Due to the low resistance of the shunt the cell operates next to short circuit.
The temperature coefficient of the short-circuit current creates a small error. Therefore, all of our silicon sensors with the extension TC have an active temperature compensation, which reduces this error by factor 20.
The compensation is realized by using a specific temperature sensor laminated to the rear side of the solar cell. The measuring signals of short-circuit current of the cell and the resistance value of the temperature sensors is measured by a microcontroller.
The calculated values of irradiance and temperature given onto a RS485 port with customer specification protocol. The electronic circuit is optimized for low power consumption.
The solar cell is embedded in Ethylene- Vinyl- Acetate (EVA) between glass and Tedlar. Plain integration into the top cover of the box Advanced weatherproof junction box made of UV resistant material with cable gland and screw-less terminal for the connection of the measuring cable, therefore, the sensor construction is comparable to that of a standard PV module. The electrical connection is realized by a 3m cable.
All sensors are calibrated in simulated sunlight against a reference cell of the same type. The reference cell is periodically calibrated against A reference cell calibrated by fraunhofer ise, freiburg.
|Solar Cell||Monocrystalline Silicon (50 mm x 33 mm)|
|Current shunt||0.1 W (TK = 30 ppm / K)|
|Operating temperature||-20°C to +70°C|
|Electrical connection||via 3 m cable, UV and weatherproof|
|Power supply||12 to 28 VDC (40 mA typically at 20 VDC)|
|Interface||RS485 up to 19200 Baud|
|Protocol||The sensor is connected via a 2-wire RS485 bus with open vendor-independent Modbus RTU protocol|
|Galvanic isolation||1000 V between power supply and RS485 bus|
|Case, protection mode||Powder-coated aluminum, IP 65|
|Dimensions, weight||155 mm x 85 mm x 40 mm, approx. 360 g|
|Irradiance||0…1500W/m2, Error with temperature compensation compared to pyranometer within the operating range of -20°C to +70°C and vertically beam of irradiance. ± 5 %|
|Temperature||Error at minimum and maximum temperature. ± 1.0°C|
|Color mapping of cable||Red (wire) Power (plus),Black (wire) Power (minus),Brown (wire) Data + / A ,Orange (wire) Data – / B ,Black (large profile) Shielding|
|Input, Wind Speed||3S-WS-PLS-CON, Wind speed sensor, reed contact, pulse with Binder 712 M9 2 pins connector|
|Input, Ambient Temperature or Module Temperature||3S-AT-PT1000-CON or 3S-MT-PT1000-CON, Ambient or module temperature sensor, PT1000, with Binder 712 M9 3 pins connector|
|Integrated Module Temp.||Integrated module temperature sensor, PT1000|
|Calibration||All sensors are calibrated in artificial sunlight against a reference cell calibrated at the Physikalisch-Technische Bundesanstalt (PTB, National Metrology Institute of Germany).|
|Baud Rate||1200, 2400, 9600, 19200, 38400|
|Parity||No, even, odd|
|Stop Bit||1, 2 (only at no parity)|
|Factory Default||9600 Baud, 8N1, address: 1|
WIRING EXTERNAL SENSORS
|3S-WS-PLS-CON||Wind speed sensor, reed contact, pulse with Binder 712 M9 2 pins connector|
|3S-AT-PT1000-CON||Ambient temperature sensor, PT1000, with Binder 712 M9 3 pins connector|
|3S-MT-PT1000-CON||Module temperature sensor, PT1000, with Binder 712 M9 3 pins connector|
|3S-MTG-01||Mounting bracket for Solar Radiation sensor 3S-SR-2T-WS-MB|
|3S-PS-12VDC||Power supply, 220VAC, 50/60Hz, 12VDC, 300mA|
|3S-Shield-A||Solar Radiation Shield for Ambient Temperature Sensor PT100, PT1000, DS18B20 etc.|