BSI PD IEC TS 60904-1-2:2019
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Photovoltaic devices – Measurement of current-voltage characteristics of bifacial photovoltaic (PV) devices
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 22 |
This part of IEC 60904 describes procedures for the measurement of the current-voltage (I-V) characteristics of bifacial photovoltaic devices in natural or simulated sunlight. It is applicable to single PV cells, sub-assemblies of such cells or entire PV modules.
The requirements for measurement of I-V characteristics of standard (monofacial) PV devices are covered by IEC 60904-1, whereas this document describes the additional requirements for the measurement of I-V characteristics of bifacial PV devices.
This document may be applicable to PV devices designed for use under concentrated irradiation if they are measured without the optics for concentration, and irradiated using direct normal irradiance and a mismatch correction with respect to a direct normal reference spectrum is performed.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | CONTENTS |
| 6 | FOREWORD |
| 8 | 1 Scope 2 Normative references |
| 9 | 3 Terms and definitions 3.1 bifacial PV device 3.2 bifaciality 3.3 rear irradiance driven power gain yield 4 General considerations |
| 10 | 5 Apparatus 5.1 General 5.2 Solar simulator with adjustable irradiance levels for single-side illumination 5.3 Solar simulator with adjustable irradiance levels for double-side illumination 5.4 Natural sunlight 5.5 Non-irradiated background and background compensation |
| 11 | 6 Additional I-V characterisations for bifacial devices 6.1 General Figures Figure 1 – Scheme of a bifacial PV module and the required non-irradiated background and aperture |
| 12 | 6.2 Determination of bifacialities Figure 2 – Front- and rear-side characterization for bifaciality |
| 13 | 6.3 Determination of the rear irradiance driven power gain yield 6.3.1 General |
| 14 | 6.3.2 Outdoor rear irradiance driven power gain yield measurement Figure 3 – Outdoor measurement |
| 15 | 6.3.3 Indoor rear irradiance driven power gain yield measurement with single-side illumination |
| 16 | 6.3.4 Indoor rear irradiance driven power gain yield measurement with double-side illumination Figure 4 – Examples of Pmax as a function of irradiance level on the rear side Gr(for outdoor or double-side illumination) or its 1-side equivalent irradiance Gf for a device of bifaciality ϕ = 80 % Tables Table 1 – Maximum peak power, Pmax, measured at different rear irradiances, Gr, (double-side with Gf = 1 000) or alternatively equivalent front irradiances, GE, and the rear irradiance driven power gain yield, BiFi, derived from the slope of the linear fit on Pmax(Gr). Also calculated values Pmax,BiFi100 and Pmax,BiFi200. |
| 17 | 7 I-V characterisation of bifacial PV devices in practice 7.1 General 7.2 I-V measurement of reference bifacial PV devices Figure 5 – Transmittances of the device (TDUT) and its encapsulant (TENC) |
| 18 | 7.3 I-V measurement of bifacial PV devices using a reference bifacial device |
| 19 | 8 Report Figure 6 – Example of Pmax,BiFi100 and Pmax,BiFi200 derived from the measurement of Pmax at STC conditions, Pmax,STC and the BiFi coefficient of the reference used in formulae (8) and (9) Table 2 – Example of Pmax,BiFi100 and Pmax,BiFi200 derived from the measurement at STC conditions (Gr = 0 and Gf = 1 000) and the rear irradiance driven power gain obtained from the bifacial reference device, BiFi,ref |
