prBAS IEC TS 60904-1-2:2025

IEC TS 60904-1-2:2024 describes procedures for the measurement of the current-voltage (I-V) characteristics of single junction bifacial photovoltaic devices in natural or simulated sunlight. It is applicable to encapsulated solar cells, sub-assemblies of such cells or entire PV modules. For measurements of I-V characteristics of non-encapsulated solar cells, IEC TS 63202-3 applies.<br /> 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.<br /> This second edition cancels and replaces the first edition published in 2019. This edition includes the following significant technical changes with respect to the previous edition:<br /> a) The scope has been updated and refers to IEC TS 63202-3 for the measurement of non‑encapsulated solar cells.<br /> b) The requirements for the non-uniformity of irradiance have been updated and now refer to classifications introduced in IEC 60904-9.<br /> c) The requirement for non-irradiated background has been revised.<br /> d) Spectral mismatch corrections are no longer mandatory, unless required by another standard. Spectral mismatch would have to be considered in the measurement uncertainty.<br /> e) The requirement regarding the calculation of bifaciality has been modified: Equivalent irradiance shall not be calculated based on the minimum bifaciality value between ISC and Pmax, but on the bifaciality of ISC.