IEC 61345:1998 pdf download – uv test for photovoltaic (PV) modules

IEC 61345:1998 pdf download – uv test for photovoltaic (PV) modules.
IEC 61345 defines a test which determines the resistance of the module when exposed to ultra-violet (UV) radiation, This test is useful for evaluating the UV resistance of materials such as polymers and protective coatings.
The object of this test is to determine the ability of the module to withstand exposure to ultraviolet (UV) radiation from 280 nm to 400 nm. Before conducting this test. light soaking or other pre-conditioning should be performed in accordance with IEC 61215 or IEC 61646.
2 NormatIve references
The following normative documents contain provlsons which, through reference In this text. constitute provisions of this International Standard. At the time of publication, the editions indicated were valid All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 60904-1:1987, Photovoltaic devices — Part I: Measurements of photovollaic current- voltage characteristics
IEC 60904-3:1989. Photovollaic devices — Part 3: Measurement principles for terrestrial photovoltaic (PV) solar devices with reference spectral irradiance data
IEC 61215:1993, Crystalline Silicon terrestrial photovollaic (PV) modules — Design qualilication and type approval
IEC 61646:1996, Thin-film terrestrial photovoltaic (P11) modules — Design qualification and type approval
3 InitIal measurements
The following Initial measurements shall be carried out:
— visual Inspection In accordance with IEC 61215 or fEC 81648:
— I-V characteristics at standard test conditions (STC) in accordance with IEC 60904-1;
— insulation test in accordance with IEC 61215 or IEC 61646.
4 Apparatus
The apparatus consists of the items listed below.
a) A temperature controlled test chamber or other arrangement with a window or fixtures for a UV light source and the module(s) under test. The chamber shall be capable of maintaining the module temperature at 60 C ± 5 C and a dry condition.
b) A UV hght source capable of producing UV radiation with an irradiance uniformity of ±15% over the test plane of the module(s) and capable of providing the necessary total irradiance in the different spectral regions of interest as defined In clause 5 C). The final test report shall indicate which UV light source is used.
c) Means for measuring and recording the temperature of the module(s) to an accuracy of ±2 C. The temperature sensors shall be attached to the front or back surface of the module near the middle. If more than one module is tested simultaneously, it will suffice to monitor the temperature of one representative sample.
d) A calibrated radiometer capable of measuring the irradiance of the UV light produced by the UV light source at the test plane of the module(s).
See annex A for suggested UV light sources.
5 Procedure
The test shall be carried out according to the procedure outlined below.
a) Use the calibrated radiometer to measure the irradiance at the proposed module test plane and ensure that, at wavelengths between 280 nm and 400 nm, the test spectral irradiance is never more than 5 times the corresponding standard spectral irradiance specified in the standard AU 1.5 solar irradiance distribution given by table I of IEC 60904-3. that there is no appreciable irradiance at wavelengths below 280 nm and that it has a uniformity of ±15 % over the test plane.
b) Mount the module in the test plane at the location selected in a) with the front side normal to the UV irradiance beam.
c) While maintaining the module temperature within the prescribed range, subject the module(s) to a minimum irradiance of
— 7.5 kWhm2 in the wavelength range between 280 nm and 320 nm, and
— 15 kWh•m-2 in the wavelength range between 320 nm and 400 nm,
d) Reorient the module so that the back side is normal to the UV irradiance beam.
e) Repeat step C) for 10 % of the time at the irradiation levels that were performed on the front Side
6 Final measurements
Repeat the following tests:
— visual inspection in accordance with IEC 61215 or IEC 61646;
— uV characteristics at STO In accordance with lEG 60904-1:
— insulation test in accordance with lEG 61215 or IEC 61646.