BS EN IEC 60904-9:2020 pdf download
BS EN IEC 60904-9:2020 pdf download.Photovoltaic devices Part 9: Classification of solar simulator characteristics.
4 Classification of solar simulator characteristics
Table 3 gives the performance requirements for the three characteristics spectral match, nonuniformity of irradlance and temporal instability of irradiance.
For the spectral match, all six intervals shown in Table I or Table 2 shall agree with the ratios in Table 3 to obtain the respective classes
— Spectral irradlance of solar simulators shall be evaluated In the extended wavelength range according to Table 2.
— Solar simulators in use and solar simulators in productionisale that have been classified under Edition 2 of this document make an exception. Spectral irradiance of these can be re-evaluated according to the same method (that of Edition 2) in the restricted wavelength range. For that purpose Table I shall be referenced. This exception shall ensure the backward compatibility, if required,
— If a significant change of PV technology occurred in the production of PV devices, the customer is encouraged to perform spectral classification in the extended wavelength range and use Table 2 to re-evaluate the simulator, In addition the sensitivity analysis for spectral mismatch uncertainty as of Annex A shall be applied.
— The method used for the spectral classification renewal (restricted or extended wavelength range) should be clearly staled in the report.
Refer to Clause 5 for procedures to measure and calculate the three characteristics of the simulator (spectral match, non-uniformity of irradiance and temporal instability of irradiance). In addition the parameters SPC and SPD shall be calculated. These results for SPC and SPO are informative.
If stated by the manufacturer a number of flashes or on-time to stabilize irradiance should be done prior to the classification.
These requirements apply to both steady state and pulsed solar simulators.
NOTE Spatial non-uniformity of irradiance corresponding to Class A. is consistent with tile requirements speofied in IEC 60904-2 for calibration at r.fer.nc. d.vic.s using simulated sunlight
If spectral match evaluation is performed in the restricted wavelength range according to Table 1. only the classifications A, B and C are permitted for each solar simulator characteristic (backward compatibility to previous Edition of this document).
Practical examples for different applications of solar simulators are given in IEC TR 60904-14.
5 Measurement procedures
5.1 Introductory remarks
It is the intent of this document to provide guidance on the required solar simulator performance data to be taken, and the required locations in the designated test area for these data to be taken. It is not the intent of this document to define the possible methods to determine the simulator spectrum or the irradiance at any location on the test plane. It is the responsibility of the simulator manufacturer or test laboratory to provide information upon request for test methods used in the determination of the performance in each classification The classification of a solar simulator does not provide full information about sources of measurement uncertainly that are related to PV performance measurements obtained with a classified solar simulator. Such uncertainties are dependent on the actual measurement devices and procedures used and need to be evaluated.
In general. the classification of solar simulators will depend on a number of factors. Also most simulators can be operated at different working points (for example different irradiances). In this case, the classification is only valid for the conditions similar to those during classification assessment. lithe intended use of the solar simulator includes a change of irradiance levels. classification shall be performed and reported at these irradiance levels.
Classification of a solar simulator is not constant but Subject to various factors:
— Ageing of lamp with operation time
– Exchange of lamp(s.)
– Lamp power setting.
— Use of any inserts in the beam of light such as optical filters or (light reducing) masks or meshes.
— Ageing or soiling of any inserts.
— Reflections from the surroundings such as properties of dark room walls.
— Pulse duration, if applicable.
Accordingly, classification only refers to the actual operating conditions, Ideally, classification as stated in the product specification or test report shall cover the range of operating conditions during practical use. Classification should be reviewed periodically.
