IEC EN 60904-7 Photovoltaic Devices - Part 7: Calculating Spectral Mismatch Correction for Measurements of Photovoltaic Devices

Electromagnetic and Electrical Tests

IEC EN 60904-7 Photovoltaic Devices - Part 7: Calculating Spectral Mismatch Correction for Measurements of Photovoltaic Devices

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 60904-7 testing. IEC EN 60904-7 describes the correction procedure for the spectral mismatch error that arises in the testing of a photovoltaic device, resulting from mismatch between the test spectrum and the reference spectrum (eg AM1.5 spectrum) and the spectral responses (SR) of the reference device under test and thus reduces systematic uncertainty.

IEC EN 60904-7 Photovoltaic Devices - Part 7: Calculating Spectral Mismatch Correction for Measurements of Photovoltaic Devices

This procedure applies to single-link devices, but the policy can be extended to multi-link devices. The purpose of this standard is to provide guidelines for correcting spectral mismatch error. There must be a spectral mismatch between the test spectrum and the reference spectrum, as well as between the reference device SR and the tested device SR. The calculated spectral mismatch correction applies only to certain combinations of test and reference instruments measured with a given test spectrum.

Because a PV device has a wavelength-dependent response, its performance is significantly affected by the spectral distribution of incoming radiation, which in natural sunlight varies with various factors such as location, weather, time of year, time of day, direction. receiving surface etc. and with a simulator, it depends on its type and conditions. If the radiation is measured with a thermopile-type radiometer (spectrally non-selective) or a reference solar cell, the spectral radiation distribution of the incident light must be known in order to make the necessary corrections to obtain the performance of the PV device.

If a reference PV device or a thermopile type detector is used to measure irradiance, it is possible to calculate the spectral mismatch correction required to obtain the short circuit current of the test PV device, following the procedure given in this standard. If the reference PV device has the same relative spectral response as the test PV device, the reference device automatically takes into account the deviations of the actual light spectral distribution from the standard spectral distribution and no further correction of spectral bias errors is required. In this case, location and weather conditions are not critical when using the reference device method for outdoor performance measurements, provided that both the reference cell and the test PV device have the same relative spectral response. Also, for identical relative SRs, the spectral classification of the simulator is not critical for indoor measurements.

EUROLAB assists manufacturers with IEC EN 60904-7 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.

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