This part of IEC 60904 describes procedures for the measurement of the current-voltage (I-V<\/i>) 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.<\/p>\n
The requirements for measurement of I-V<\/i> 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<\/i> characteristics of bifacial PV devices.<\/p>\n
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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3 Terms and definitions 3.1 bifacial PV device 3.2 bifaciality 3.3 rear irradiance driven power gain yield 4 General considerations <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 6 Additional I-V characterisations for bifacial devices 6.1 General Figures Figure 1 \u2013 Scheme of a bifacial PV module and the required non-irradiated background and aperture <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 6.2 Determination of bifacialities Figure 2 \u2013 Front- and rear-side characterization for bifaciality <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 6.3 Determination of the rear irradiance driven power gain yield 6.3.1 General <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 6.3.2 Outdoor rear irradiance driven power gain yield measurement Figure 3 \u2013 Outdoor measurement <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6.3.3 Indoor rear irradiance driven power gain yield measurement with single-side illumination <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 6.3.4 Indoor rear irradiance driven power gain yield measurement with double-side illumination Figure 4 \u2013 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 \u03d5 = 80 % Tables Table 1 \u2013 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. <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 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 \u2013 Transmittances of the device (TDUT) and its encapsulant (TENC) <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 7.3 I-V measurement of bifacial PV devices using a reference bifacial device <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 8 Report Figure 6 \u2013 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 \u2013 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 <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Photovoltaic devices – Measurement of current-voltage characteristics of bifacial photovoltaic (PV) devices<\/b><\/p>\n |