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GB/T 6495.101-2025: Photovoltaic devices - Part 1-1: Measurement of current-voltage characteristics of multi-junction photovoltaic (PV) devices
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GB/T 6495.101-2025: Photovoltaic devices - Part 1-1: Measurement of current-voltage characteristics of multi-junction photovoltaic (PV) devices

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ICS 27.160 CCSK83 National Standards of the People's Republic of China Photovoltaic Devices Part 1-1.Multijunction Photovoltaic Devices Measurement of current-voltage characteristics (IEC 60904-1-1.2017, IDT) Published on 2025-12-31 Implemented on April 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III Introduction IV 1.Scope 1 2 Normative References 1 3.Terms and Definitions 2 4 General Principles 2 5 General Measurement Requirements 2 6 Instruments 3 6.1 General requirements for irradiance 3 6.2 Standard Components 4 7 Test Conditions 4 7.1 Overview 4 7.2 Parameter 4 7.3 Measurement Conditions 5 8.Measurement of current-voltage characteristics 5 8.1 Measurements were performed using adjustable spectral irradiance. 5 8.2 Measurements were performed using a fixed spectral irradiance and natural sunlight. 6 9 Data Analysis 6 10 Reports 6 References 7

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 1-1 of GB/T 6495 "Photovoltaic Devices". GB/T 6495 has already published the following parts. ---Part 1.Measurement of Photovoltaic Current-Voltage Characteristics; ---Part 1-1.Measurement of Current-Voltage Characteristics of Multijunction Photovoltaic Devices; ---Part 2.Requirements for Standard Photovoltaic Devices; ---Part 3.Measurement Principles of Ground-Based Photovoltaic Devices Based on Standard Spectral Irradiance Data; ---Part 5.Determining the Equivalent Cell Temperature (ECT) of Photovoltaic Devices Using the Open-Circuit Voltage Method; ---Part 7.Calculation Method for Spectral Mismatch Correction in Photovoltaic Device Measurements; ---Part 8.Measurement of the Spectral Response of Photovoltaic Devices; ---Part 8-1.Measurement of the Spectral Response of Multijunction Photovoltaic Devices; ---Part 9.Characteristic Classification of Solar Simulators; ---Part 10.Methods for measuring linear correlation and linearity; ---Part 11.Initial light-induced degradation test method for crystalline silicon solar cells. This document is equivalent to IEC 60904-1-1.2017 "Photovoltaic devices - Part 1-1.Measurement of current-voltage characteristics of multijunction photovoltaic devices". The following minimal editorial changes have been made to this document. ---The background information within the scope is placed in the introduction. Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This document is under the jurisdiction of the National Technical Committee on Standardization of Solar Photovoltaic Energy Systems (SAC/TC90). This document was drafted by. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences; Tongwei Solar (Chengdu) Co., Ltd.; and China Electric Power Corporation. Sub-Technology Standardization Institute, LONGi Green Energy Technology Co., Ltd., National Institute of Metrology, Fujian Institute of Metrology, Zhejiang Jianheng Testing Technology Co., Ltd. The main drafters of this document are. Liu Zhengxin, Shi Qiang, Wu Jingqiu, Li Zhenguo, Zhang Yunsha, Chen Xiaoda, Zhuang Tianqi, Meng Haifeng, Chen Caiyun, and Tong Hongbo. Shao Yahui.

Introduction

GB/T 6495 proposes methods for measuring the performance of photovoltaic devices, as well as standards, value transfer, and result correction related to performance measurement. The requirements for the classification of testing equipment, etc., have positive guiding significance for the performance measurement of photovoltaic devices such as photovoltaic cells and photovoltaic modules. GB/T 6495 is proposed to consist of the following parts. ---Part 1.Measurement of Photovoltaic Current-Voltage Characteristics. The purpose is to define the basic requirements for measuring the IV curve of photovoltaic devices. ---Part 1-1.Measurement of Current-Voltage Characteristics of Multijunction Photovoltaic Devices. The purpose is to specify the measurement of the IV characteristics of multijunction photovoltaic devices. Quantification method. ---Part 1-2.Measurement of Current-Voltage Characteristics of Bifacial Photovoltaic Devices. The purpose is to specify the IV characteristic measurement of bifacial photovoltaic modules. Quantification method. ---Parts 1-3.Measurement of Current-Voltage Characteristics of Curved Photovoltaic Devices. The purpose is to specify the measurement of the IV characteristics of curved photovoltaic devices. Quantification method. ---Part 2.Requirements for Standard Photovoltaic Devices. The purpose is to specify the requirements for standard photovoltaic devices. ---Part 3.Measurement Principles of Ground-Based Photovoltaic Devices Based on Standard Spectral Irradiance Data. The aim is to provide standard photovoltaic irradiance data. Degree data. ---Part 4.Procedures for Establishing Standard Photovoltaic Device Calibration Traceability. The purpose is to establish traceability for photovoltaic device calibration. program. ---Part 5.Determining the Equivalent Cell Temperature (ECT) of Photovoltaic Devices Using the Open-Circuit Voltage Method. The aim is to define the equivalent cell temperature (ECT) of photovoltaic devices. Method for testing the open-circuit voltage of battery temperature. ---Part 7.Calculation Method for Spectral Mismatch Correction in Photovoltaic Device Measurements. The purpose is to specify the calculation method for spectral mismatch correction. ---Part 8.Measurement of the Spectral Response of Photovoltaic Devices. The purpose is to specify the methods for measuring the spectral response. ---Part 8-1.Measurement of the Spectral Response of Multijunction Photovoltaic Devices. The purpose is to specify the measurement method for the spectral response of multijunction photovoltaic devices. method. ---Part 9.Classification of Solar Simulator Characteristics. The purpose is to specify the classification requirements for solar simulators used to measure photovoltaic devices. ---Part 10.Methods for Measuring Linear Correlation and Linearity Characteristics. The aim is to define the linearity characteristics of photovoltaic devices and their testing. method. ---Part 11.Test Method for Initial Light-Induced Degradation of Crystalline Silicon Solar Cells. The purpose is to specify the initial light-induced degradation test method for crystalline silicon solar cells. Attenuation test method. ---Part 12.Measurement methods for the current-voltage (IV) characteristics of perovskite photovoltaic cells and modules. The purpose is to specify the measurement methods for the current-voltage (IV) characteristics of perovskite photovoltaic cells and modules. Methods for measuring the IV characteristics of voltage-voltage devices. ---Part 13.Electroluminescence of Photovoltaic Modules. The purpose is to specify the testing methods for the electroluminescence of photovoltaic modules. Note. The correspondence between each part and the IEC 60904 series of international standards is as follows. ---Part 1 corresponds to IEC 60904-1; ---Part 1-1 corresponds to IEC 60904-1-1; ---Parts 1-2 correspond to IEC 60904-1-2; ---Parts 1-3 correspond to IEC 60904-1-3; ---Part 2 corresponds to IEC 60904-2; ---Part 3 corresponds to IEC 60904-3; ---Part 4 corresponds to IEC 60904-4; ---Part 5 corresponds to IEC 60904-5; ---Part 7 corresponds to IEC 60904-7; ---Part 8 corresponds to IEC 60904-8; ---Part 8-1 corresponds to IEC 60904-8-1; ---Part 9 corresponds to IEC 60904-9; ---Part 10 corresponds to IEC 60904-10; ---Part 13 corresponds to IEC 60904-13. This document describes methods for measuring the current-voltage characteristics of multi-junction photovoltaic devices under natural light or simulated sunlight. These methods are applicable to... This applies to individual photovoltaic cells, portions of such cells, or the entire photovoltaic module. The spectral responsivity of multi-junction photovoltaic devices is known to be... A crucial prerequisite for measuring current-voltage characteristics is the measurement of their spectral response, and Part 8-1 of GB/T 6495 covers the measurement methods for this. Photovoltaic Devices Part 1-1.Multijunction Photovoltaic Devices Measurement of current-voltage characteristics

1 Scope

This document specifies the measurement procedures and additional requirements for the current-voltage characteristics of multi-junction photovoltaic devices under natural or simulated sunlight. This document applies to a single photovoltaic cell, a substring of multiple cells, or a complete photovoltaic module. This document is primarily applicable to non-concentrated photovoltaic modules. This applies to photovoltaic devices, but some of the content may also apply to concentrated photovoltaic devices. For photovoltaic devices designed for concentrated lighting conditions, if there is no... In the case of concentrated optical components, measurements are taken using a direct light source, and spectral mismatch correction is performed based on the standard direct irradiance distribution. Therefore, this document... It may still apply.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 46982-2025 Photovoltaic devices – Temperature and irradiance correction methods for IV characteristics (IEC 60891-2021, IDT) Note. GB/T 6495.1-2025 Photovoltaic devices - Part 1.Measurement of photovoltaic current-voltage characteristics (IEC 60904-1.2020, IDT) Note. GB/T 6495.2-2025 Photovoltaic devices - Part 2.Requirements for standard photovoltaic devices (IEC 60904-2.2023, IDT) IEC 60904-3 Photovoltaic devices – Part 3.Measurement principles of terrestrial photovoltaic devices based on standard spectral irradiance data [Photo- Note. GB/T 6495.3-2025 Photovoltaic devices - Part 3.Measurement principles of terrestrial photovoltaic devices based on standard spectral irradiance data (IEC 60904- 3.2019, IDT) IEC 60904-7 Photovoltaic devices – Part 7.Calculation method for spectral mismatch correction in photovoltaic measurements vices) Note. GB/T 6495.7-2025 Photovoltaic devices - Part 7.Calculation method for spectral mismatch correction in photovoltaic device measurements (IEC 60904-7.2019, IDT) IEC 60904-8 Photovoltaic devices - Part 8.Measurement of the spectral response of photovoltaic devices Note. GB/T 6495.801-2025 Photovoltaic devices - Part 8.Measurement of spectral response of photovoltaic devices (IEC 60904-8.2014, IDT) IEC 60904-8-1 Photovoltaic devices – Part 8-1.Measurement of the spectral response of multijunction photovoltaic devices ...