What is BS EN IEC 60904-7- Photovoltaic devices about?
BS EN IEC 60904 series covers photovoltaic devices. BS EN IEC 60904-7 is one of the parts of a series of documents that describes the procedure for correcting the spectral mismatch error introduced in photovoltaic device testing, caused by a mismatch between the test spectrum and the reference spectrum, as well as a mismatch between the spectral responsivities (SR) of the reference device and the device under test, and thus reducing the systematic uncertainty.
This procedure is applicable to single-junction devices, although the theory can be applied to multi-junction devices as well.
The goal of BS EN IEC 60904-7 is to provide best practice guidance for correcting spectral mismatch errors that may occur between the test spectrum and the reference spectrum, as well as between the reference device SR and the device under test SR. The spectral mismatch correction generated is only valid for the specific combination of test and reference devices detected with a specific test spectrum.
Who is BS EN IEC 60904-7 - Photovoltaic devices for?
BS EN IEC 60904-7 on photovoltaic devices is applicable to:
- Photovoltaic devices manufacturers
- Telecommunication repeater stations.
- Water pumps
- Navigational aids
- Cottages and remote residences
- Parks in remote regions
- Supplying occasional power
Why should you use BS EN IEC 60904-7 - Photovoltaic devices?
Photovoltaic devices device has a wavelength-dependent spectral responsivity, its performance is significantly affected by the spectral distribution of the incident radiation, which in natural sunlight varies with several outdoor environment factors and with a solar simulator varies with its type and conditions. BS EN IEC 60904-7 helps you for the correcting the spectral mismatch error introduced in photovoltaic device testing and improves the performance of the Photovoltaic device.
If a reference PV device or a thermopile type detector is used to measure the irradiance, the spectral mismatch correction required to obtain the short-circuit current of the device under test under the reference spectral irradiance distribution in IEC 60904-3 or any other reference spectrum can be calculated using the procedure described in BS EN IEC 60904-7.
What’s changed since the last update?
BS EN IEC 60904-7:2019 supersedes BS EN 60904‑7:2009, which is withdrawn. BS EN IEC 60904-7:2019 includes some technical changes with respect to BS EN 60904‑7:2009. These include:
- For better compatibility and less redundancy, the clause “Determination of test spectrum” refers to IEC 60904-9
- The spectral mismatch factor is called SMM instead of MM to enable differentiation to the angular mismatch factor AMM and spectral angular mismatch factor SAMM
- Formulae for the derivation and application of the spectral mismatch factor SMM are added
- Links to new standards are given, e.g. concerning multi-junction devices Corrected wording (responsivity instead of response and irradiance instead of intensity)
