IEC 60904-2-2015 pdf free download – Photovoltaic devices – Part 2: Requirements for photovoltaic reference devices.
This standard covers photovoltaic reference devices used to determine the electricalperformance of photovoltaic cells, modules and arrays under natural and simulated sunlight. Itdoes not cover photovoltaic reference devices for use under concentrated sunlight.
2Normative references
The following documents, in whole or in part, are normatively referenced in this document andare indispensable for its application.For dated references,only the edition cited applies.Forundated’references,the latest edition of the referenced document (including anyamendments) applies.
IEC 60891,Photovoltaic devices – Procedures for temperature and irradiance corrections tomeasured i-v characteristics
IEC 60904-1，Photovoltaic devices – Part 1: Measurements of photovoltaic current-voltagecharacteristics
IEC 60904-3,Photovoltaic devices – Part 3: Measurement principles for terrestrialphotovoltaic(PV) solar devices with reference spectral irradiance data
IEC 60904-4，Photovoltaic devices – Part 4: Reference solar devices – Procedures forestablishing calibration traceability
IEC 60904-5,Photovoltaic devices – Part 5: Determination of the equivalent cell temperature(ECT) of photovoltaic(PV) devices by the open-circuit voltage method
IEC 60904-7,Photovoltaic devices – Part 7: Computation of the spectral mismatch correctionfor measurements of photovoltaic devices
IEC 60904-8,Photovoltaic devices – Part 8: Measurement of spectral responsivity of aphotovoltaic (Pv) device
IEC 60904-9, Photovoltaic devices – Part 9: Solar simulator performance requirements
IEC 60904-10,Photovoltaic devices – Part 10: Methods of linearity measurement
IEC TS 61836,Solar photovoltaic energy systems – Terms, definitions and symbols
3 Terms and definitions
For the purposes of this document, the terms and definitions given in lEC TS 61836 and thefollowing apply.
3.1
calibration traceability
traceability as defined in IEC 60904-4
Note 1 to entry: Photovoltaic reference devices are distinguished by their position in a chain of calibration traceability.
3.2
primary reference device
photovoltaic reference device whose calibration is based on a radiometer or standard detector or standard light source traceable to SI units as defined in IEC 60904-4
3.3
secondary reference device
photovoltaic reference device calibrated in natural or simulated sunlight against a primary reference device
3.4
working reference device
photovoltaic reference device calibrated in natural or simulated sunlight against a secondary reference device
3.5
reference devices
specially calibrated photovoltaic devices which are used to measure natural or simulated irradiance or to set simulator irradiance levels for measuring the performance of other
photovoltaic devices
3.6
reference cell
single photovoltaic cell used primarily for transfer of calibration values
Note 1 to entry: For practical reasons, such cells are small in surface area, and are usually mounted on a fixture which ensures reproducbility in mounting, thermal control and electrical connections. A typical sample is sketched in Figure 1.
3.6.1
reference cell with protective cover but without encapsulant
photovoltaic reference cell similar to 3.6, but provided with a protective cover
Note 1 to entry: Recommended use: as a laboratory primary, secondary and working reference, in particular whenmeasuring the performance of other photovoltaic devices using solar simulators or natural sunlight with direct beamonly.
3.6.2
encapsulated reference cell
photovoltaic reference cell similar to 3.6, but encapsulated in a protective assembly so as towithstand short-term outdoor exposure
Note 1 to entry: Recommended use: as a laboratory primary, secondary and working reference, in particular whenmeasurements of the performance of other photovoltaic devices under natural sunlight are performed.
Note 2 to entry: lf the encapsulation system has been demonstrated to withstand long-term outdoor exposure,applying test levels according to IEC 61215,such reference cells may also be suitable to be used as a monitoringdevice for long-term assessment of operational photovoltaic arrays.
3.7
multi-cell reference devices
photovoltaic device consisting of several photovoltaic cells
Note 1 to entry: Recommended use: as the diffuse component of natural sunlight and non-normal incidence ofsimulated sunlight interact with encapsulants and back sheets of a module and influence the amount of irradiancewhich a particular cell receives, it is recommended that reference devices used for measuring sub-assemblies ofmodules and arrays be encapsulated in a multi-cell package, matching the mechanical and optical features of thetest specimen (module, sub-assemblies of modules， arrays) so as to respond to variations in the geometricaldistribution of the incident radiation in the same way as the test specimen.IEC 60904-2 pdf download.