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IEC 60904-9:2020 © IEC 2020
Table 2 – Global reference solar spectral irradiance distribution given
in IEC 60904-3 contribution of wavelength intervals to total irradiance
in the extended wavelength range 300 nm to 1 200 nm
Wavelength range
nm
Percentage of total irradiance
in the wavelength range
300 nm to 1 200 nm
%
Cumulative integrated
irradiance
%
1
300 to 470
16,61
16,61
2
470 to 561
16,74
33,35
3
561 to 657
16,67
50,02
4
657 to 772
16,63
66,65
5
772 to 919
16,66
83,31
6
919 to 1 200
16,69
100,00
Note 2 to entry: It is generally recognized that this classification does not allow for prediction
of PV module power
measurement uncertainties. The methods of IEC 60904-7 and this document’s Annex A should be used to
understand and potentially correct for spectral mismatch errors.
3.9
spatial non-uniformity of irradiance in the test plane
(1)
where the maximum and minimum irradiance are those measured with the detector(s) over the
designated test area.
Note 1 to entry: Often, a wide range of values for non-uniformity of irradiance
can produce errors < 1 % in PV
module
power measurements, though this should be analysed on a case-by-case basis.
Various publications on
this topic are given in the bibliography.
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