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PD IEC TS 60904-1-2:2019 Photovoltaic devices - Measurement of current-voltage characteristics of bifacial photovoltaic (PV) devices, 2019
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- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms and definitions [Go to Page]
- 3.1 bifacial PV device
- 3.2 bifaciality
- 3.3 rear irradiance driven power gain yield
- 4 General considerations
- 5 Apparatus [Go to Page]
- 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
- 6 Additional I-V characterisations for bifacial devices [Go to Page]
- 6.1 General
- Figures [Go to Page]
- Figure 1 – Scheme of a bifacial PV module and the required non-irradiated background and aperture
- 6.2 Determination of bifacialities
- Figure 2 – Front- and rear-side characterization for bifaciality
- 6.3 Determination of the rear irradiance driven power gain yield [Go to Page]
- 6.3.1 General
- 6.3.2 Outdoor rear irradiance driven power gain yield measurement
- Figure 3 – Outdoor measurement [Go to Page]
- 6.3.3 Indoor rear irradiance driven power gain yield measurement with single-side illumination
- 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 [Go to Page]
- 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.
- 7 I-V characterisation of bifacial PV devices in practice [Go to Page]
- 7.1 General
- 7.2 I-V measurement of reference bifacial PV devices
- Figure 5 – Transmittances of the device (TDUT) and its encapsulant (TENC)
- 7.3 I-V measurement of bifacial PV devices using a reference bifacial device
- 8 Report [Go to Page]
- 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 [Go to Page]
