Sensor box for solar PV plants. Wind speed, ambient temperature or module temperature sensor can be connected. Compatible with Huawei Smartlogger EMI.
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||Datasheet|
|3S-AT-PT1000-CON||Ambient temperature sensor, PT1000, with Binder 712 M9 3 pins connector||Datasheet|
|3S-MT-PT1000-CON||Module temperature sensor, PT1000, with Binder 712 M9 3 pins connector||Datasheet|
|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.||Datasheet|