Irradiance Sensor With Analog Output



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.

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 sensor are measured by a micro controller.

The calculated values of irradiance and temperature given onto a 4-20mA or 0-10V 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.


General Information
Solar Cell Monocrystalline Silicon (52 mm x 52 mm)
Current shunt High precision shunt resistor directly soldered to the terminals of the cell
Operating temperature -30°C to +70°C
Electrical connection via 3 m cable, UV and weatherproof
Power supply 12 to 28 VDC (30 mA typically at 20 VDC)
Case, protection mode Advanced weatherproof junction box made of UV resistant material, IP54
Dimensions, weight 94 mm x 94 mm x 57 mm, approx. 200 g
Irradiance 0…1400 W/m2, Accuracy of monthly sums compared to a W.M.O.
class 1 Pyranometer (e.g. CMP 11) according to ISO 9060: better ±5%
Drift Very small drift of <0.3%/ year
Electrical Connection
Green Output Irradiance
Brown Power supply Irradiance (+)
Yellow Output Temperature
White Power supply Temperature (+)
Calibration Individual calibration of each sensors in the natural sunlight at AM 1,5
spectrum by means of a compatible calibrated reference cell.
Handling Case The sensor can be cleaned using a smooth cotton cloth, water and a mild cleaning fluid.
Opening of the sensor case by the user or installation staff is not necessary.
If the case is opened, we cannot guarantee the seal of the case anymore.
Signal output
Type I 4…20 mA
Linearity 0…1400 W/m2
Type U 0…10 V
Linearity 0…1400 W/m2

Things you should know about the Irradiance Sensor with Analog output

SEVEN Sensor Solutions, as a weather station supplier, produces two types of irradiance sensors: one with a Modbus RTU output and other with an analog output.

The irradiance sensor or PV pyranometer is a device used to measure sunlight and monitor the performance of the solar system at any time. It is a well-known and cost-effective sensor. It measures the saved energy and the performance of the system accurately and reliably.

SEVEN’s Analog Irradiance Sensor

In general, analog sensors produce a continuous output signal or voltage that is usually proportional to the measured quantity. Physical quantities such as temperature, velocity, pressure, displacement, strain, etc. are all analog quantities because they tend to be continuous in nature.

The SEVEN Irradiance Sensor, with Analog output, is a weatherproof junction box made of UV-resistant materials. It is made from a monocrystalline solar cell connected to a high-precision shunt. It contains an analog output which is used to measure the radiation value in solar power plants by plugging into analog input dataloggers. The sensors measure precise deviations between potential and actual electricity production and provide important statistics on the quality of the entire system.

The Analog irradiance sensor is mounted in such a way that it receives solar radiation straight from the sun. It must therefore be aligned with the photovoltaic panels in order to obtain the same measurements. The height at which the photovoltaic pyranometer is mounted is not critical for the accuracy of the measurement. SEVEN sensor Solutions provides an irradiation sensor with 6 mm diameter holes for mounting brackets and mounting brackets on both sides, left and right, so that it can be flexibly mounted on the solar panel, no matter where it is located.

Brands that use SEVEN’s analog irradiation sensor

The SEVEN analog radiation sensor is used for SMA weather stations that include wind speed/direction sensors and ambient temperature/module sensors, plus the radiation sensor, as it is fully compatible with SMA’s DATA Manager M. It is also used for SolarEdge and Kaco weather stations because it is compatible with their dataloggers, Gateway and BlueLog, and all other dataloggers with analog inputs. You can visit our website for more information about our sensors.

Our engineers, as part of SEVEN Sensor Solutions, are available to assist customers with remote setup service and information on anything they may need.