This document defines procedures to be followed for temperature and irradiance corrections to the measured I-V (current-voltage) characteristics (also known as I-V curves) of photovoltaic (PV) devices. It also defines the procedures used to determine factors relevant to these corrections. Requirements for I-V measurement of PV devices are laid down in IEC 60904-1 and its relevant subparts. The PV devices include a single solar cell with or without a protective cover, a sub-assembly of solar cells, or a module. A different set of relevant parameters for I-V curve correction applies for each type of device. The determination of temperature coefficients for a module (or subassembly of cells) may be calculated from single cell measurements, but this is not the case for the internal series resistance and curve correction factor, which should be separately measured for a module or subassembly of cells. Refer to Annex A for alternative procedures for series resistance determination. The use of I-V correction parameters are valid for the PV device for which they have been measured. Variations may occur within a production lot or the type class.

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53	A-30369160
54	undefined
57	Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
58	English CONTENTS
60	FOREWORD
62	1 Scope 2 Normative references
63	3 Terms and definitions, symbols and abbreviated terms
64	4 Correction procedures 4.1 General
65	Table 1 – Overview of correction procedures for irradiance corrections (i.e. T1 = T2)
66	Table 2 – Overview of correction procedures for temperature corrections (i.e. G1 = G2)
67	4.2 Correction procedure 1
68	4.3 Correction procedure 2
70	4.4 Correction procedure 3 4.4.1 General 4.4.2 Correction for the irradiance and temperature from two measured I-V curves
72	Figures Figure 1 – Example of the correction of the I-V characteristics byformulae (10) and (11) Figure 2 – Schematic diagram of the relation of G3 and T3 which can be chosen in the simultaneous correction for irradiance and temperature, for a fixed set of T1, G1, T2,and G2 by formulae (12) and (13)
73	4.4.3 Correction to various irradiances and temperatures from three I-V curves 4.4.4 Correction to various irradiances and temperatures from four measured I-V curves Figure 3 – Schematic diagram of the processes for correcting the I-V characteristics to various ranges of irradiance and temperature based on three measured characteristics
74	4.5 Correction procedure 4 Figure 4 – Schematic diagram of the processes for correcting the I-V characteristicsto various ranges of irradiance and temperature based on four measured characteristics
76	5 Determination of temperature coefficients 5.1 General 5.2 Apparatus
77	Figure 5 – Example positions for measuring the temperatureof the test module behind the cells
78	5.3 Procedure in natural or steady-state simulated sunlight
79	5.4 Procedure with a pulsed solar simulator 5.5 Calculation of temperature coefficients
80	6 Determination of internal series resistance RS and R’S 6.1 General
81	6.2 Determination of RS in correction procedures 1 and 4
82	Figure 6 – Determination of internal series resistance
83	6.3 Determination of B1 and B2 in correction procedure 2 Figure 7 – Determination of internal series resistance when the corrected I-V characteristics intersect
84	6.4 Determination of R(S in correction procedure 2
85	Figure 8 – Determination of irradiance correction factors B1 and B2 and internal series resistance, R’S
86	6.5 Determination of RS in correction procedure 4
87	7 Determination of the curve correction factor κ and κ’ 7.1 General 7.2 Procedure Figure 9 – Determination of internal series resistanceof a PV module from a single I-V curve
88	8 Reporting Figure 10 – Determination of curve correction factor
90	Annex A (informative)Alternative procedures for series resistance determination A.1 General A.2 Differential resistance at VOC against inverse irradiance method Figure A.1 – Determination of internal series resistance
91	Bibliography

Published By	Publication Date	Number of Pages
BSI	2022	92


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Status	Definitive
Pages	92
Publication Date	2022-06-27
ISBN	978 0 539 21415 4
Standard Number	BS EN IEC 60891:2021 – TC
Title	Tracked Changes. Photovoltaic devices. Procedures for temperature and irradiance corrections to measured I-V characteristics
Descriptors	Solar cells, Mathematical calculations, Silicon, Temperature, Photoelectric cells, Error correction, Solar radiation, Photovoltaic cells, Direct energy conversion, Electrical resistance
Publisher	BSI
Committee	GEL/82
ICS Codes	27.160 - Solar energy engineering

BS EN IEC 60891:2021 – TC:2022 Edition

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