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GB/T 6495.5-2025: Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic devices by the open-circuit voltage method
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GB/T 6495.5-2025	English	294	Add to Cart	3 days [Need to translate]	Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic devices by the open-circuit voltage method
GB/T 6495.5-1997	English	179	Add to Cart	3 days [Need to translate]	Photovoltaic devices. Part 5: Determination of the equivalent cell temperature(ECT) of photovoltaic (PV)devices by the open-circuit voltage method

GB/T 6495.5-2025: Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic devices by the open-circuit voltage method

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ICS 27.160 CCSK83 National Standards of the People's Republic of China Replaces GB/T 6495.5-1997 Photovoltaic Devices Part 5.Determination Using the Open-Circuit Voltage Method Equivalent cell temperature (ECT) of photovoltaic devices (IEC 60904-5.2011, IDT) Published on 2025-12-31 Implemented on July 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.Measurement Principles and Requirements 2 4.1 Measurement Principle 2 4.2 General Measurement Requirements 2 5 Equipment Requirements 2 6.Input parameters are determined 2 7 Measurement Procedure 3 7.1 General Rules 3 7.2 Measurement under controlled conditions 3 7.3 Measurements under arbitrary irradiation conditions 3 8.Calculate the equivalent cell temperature 4 9 Report 4 References 6

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 5 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 Principle 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 replaces GB/T 6495.5-1997 "Photovoltaic devices - Part 5.Determination of equivalent photovoltaic (PV) devices by open-circuit voltage method". The main technical changes in "Battery Temperature (ECT)" compared to GB/T 6495.5-1997, apart from structural adjustments and editorial modifications, are as follows. ---The scope has been changed (see Chapter 1, Chapter 1 of the.1997 edition); ---Added "Terms and Definitions" (see Chapter 3); ---Added "Measurement Principles and Requirements" (see Chapter 4); ---Added "Input Parameter Determination" (see Chapter 6); ---Added "Calculate Equivalent Cell Temperature" (see Chapter 8); ---A "Report" section has been added (see Chapter 9). This document is equivalent to IEC 60904-5.2011 "Photovoltaic devices - Part 5.Determination of the gradation of photovoltaic (PV) devices by open-circuit voltage method". Effective battery temperature (ECT). The following editorial changes have been made to this document. ---Clause a) in Chapter 4 is deleted; the preceding sentence already contains this clause. ---Incorporates amendments to IEC 60904-5.2011/AMD1.2022; the relevant clauses are indicated by vertical margins. The double lines (‖) are marked. 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. Canadian Solar Inc., China Electronics Technology Standardization Institute, and LONGi Green Energy Technology Co., Ltd. Joint-stock company, Guoyuan Testing & Inspection Technology (Jiangsu) Co., Ltd., Changshu Canadian Solar Inc., Zhejiang Xineng Photovoltaic Technology Co., Ltd. The main drafters of this document are. Wei Yuanjie, Zhang Guangchun, Li Zhenguo, Chen Xiaoda, Zhuang Tianqi, Ma Jingtao, Ge Huayun, Xu Tao, and Zhang Zhenhao. Xiao Lingchao. The release history of this document and the document it replaces is as follows. ---First published in.1997 as GB/T 6495.5-1997; ---This document is the first revision.

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. When using temperature sensors (such as thermocouples) to determine the cell temperature of a photovoltaic device under natural or simulated steady-state irradiation conditions, Two main problems arise. First, significant differences in temperature distribution can be observed within the module area. Second, because photovoltaic cells typically... Since direct contact is not possible, sensors are typically attached to the back of the component; therefore, the measured temperature is affected by the thermal conductivity of the encapsulation and backplane materials. These problems are exacerbated when the equivalent cell temperature of the photovoltaic array is measured on-site, as the temperature of all cells is slightly higher at this time. Unlike other methods, the average temperature of a battery cannot be easily measured. Equivalent cell temperature (ECT) refers to the electronic junction temperature of a photovoltaic device (photovoltaic cells, photovoltaic modules, and photovoltaic arrays composed of similar modules). The average junction temperature. If the entire device operates uniformly at this junction temperature, it is equivalent to the operating temperature of the photovoltaic device. For components with high thermal inertia, such as double-glass structures used in building-integrated photovoltaics (BIPV), the cells under transient conditions... The increased temperature difference between the inside and outside of the module makes measurement more challenging. Furthermore, for bifacial photovoltaic modules, temperature sensors may be obstructed. A running battery may even create localized hot spots in the battery area where the sensor is located. Note 1.The rated operating temperature (NMOT) of the module refers to the light output of the module at near maximum power under the following standard reference environment and open installation conditions. The average junction temperature of a volt-volt cell. ---Component installation tilt angle. (37±5)°; ---Total irradiance. 800 W/m²; ---Ambient temperature. 20℃; ---Wind speed. 1 m/s; ---Electronic load. A resistive load sized to allow the component to operate near its maximum power point under standard test conditions (STC), or It is an electronic maximum power point tracker (MPPT). Note 2.The testing method for module rated operating temperature (NMOT) is similar to that for battery rated operating temperature (NOCT), the difference being that NMOT is tested at the module's highest rated operating temperature. The measurement was taken at the high power point, not under open-circuit conditions. Therefore, the module will output more power at maximum power conditions compared to open-circuit conditions. (Electrical) energy, therefore less heat is dissipated inside the component compared to open-circuit conditions. Therefore, NMOT is typically a few degrees cooler than the previous NOCT. Photovoltaic Devices Part 5.Determination Using the Open-Circuit Voltage Method Equivalent cell temperature (ECT) of photovoltaic devices

1 Scope

This document describes the methods used to identify photovoltaic devices (including photovoltaic cells, photovoltaic modules, and photovoltaic arrays composed of similar modules). The preferred method for ECT (Electro-Conductivity Transformer) is to compare the thermal characteristics of photovoltaic devices, determine whether NOCT (Normally Oxygen-Conductor Transformer) or NMOT (Normally Oxygen-Conductor Transformer), and convert the measured current-electrical... The pressure (IV) characteristics are converted to equivalent values at other temperatures. This document applies to linear devices where the open-circuit voltage (Voc) exhibits a logarithmic relationship with irradiance under steady-state conditions. This document can be used for all... The technology is applicable, but it must be verified that there are no pretreatment effects that could affect the measurement.

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. Note. GB/T 46982-2025 Temperature and Irradiance Correction Methods for IV Characteristics of Photovoltaic Devices (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) IEC TS60904-1-2.2024 Photovoltaic devices – Part 1-2.Measurement of current-voltage characteristics of bifacial photovoltaic devices [Photovoltaic devices-Part 1-2.Measurement of current-voltage characteristics of bifacial IEC 60904-2 Photovoltaic devices – Part 2.Requirements for standard photovoltaic devices (IEC 60904-2.2020, IDT) Note. GB/T 6495.2-2025 Photovoltaic devices - Part 2.Requirements for standard photovoltaic devices (IEC 60904-2.2023, 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) Note. GB/T 6495.10-2025 Photovoltaic devices - Part 10.Methods for measuring linear correlation and linearity characteristics (IEC 60904-10.2020, IDT) Note. GB/T 9535.2-2025 Design qualification and type approval of ground-mounted photovoltaic modules - Part 2.Test procedures (IEC 61215-2.2021, IDT) Note. GB/T 18210-2025 Field measurement of current-voltage characteristics of photovoltaic arrays (IEC 61829.2015, IDT) ...