Overview
IEC 62670-1:2013, titled Photovoltaic Concentrators (CPV) - Performance Testing - Part 1: Standard Conditions, is a critical international standard developed by the International Electrotechnical Commission (IEC). It establishes standardized conditions for assessing power output of Concentrator Photovoltaic (CPV) systems and their subcomponents. The main goal is to ensure consistent and comparable power ratings on product data sheets and nameplates, creating a uniform benchmark for CPV performance evaluation worldwide.
The standard applies to all CPV technologies with a geometric concentration ratio greater than 3X, which require solar tracking systems for operation. IEC 62670-1 defines two primary sets of standard conditions for testing and rating CPV modules and systems: operating conditions that simulate on-sun performance, and controlled test conditions replicable in laboratory environments.
Key Topics
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Standardized Operating Conditions (CSOC)
- Irradiance: 900 W/m² direct normal irradiance (DNI)
- Ambient Temperature: 20 °C
- Wind Speed: 2 m/s
- Spectral Distribution: Direct normal AM1.5 spectrum per IEC 60904-3
- Emphasizes real-world performance relevant to typical meteorological data
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Standard Test Conditions (CSTC)
- Irradiance: 1000 W/m² direct normal irradiance (DNI)
- Cell Temperature: 25 °C
- Spectral Distribution: Direct normal AM1.5 spectrum consistent with IEC 60904-3
- Suitable for repeatable, controlled environment testing in labs and test facilities
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Angle of Incidence Correction
For systems using single-axis tracking, the DNI values are adjusted according to incident light angles to accurately reflect operational conditions.
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Normative References
IEC 62670-1 references important standards such as IEC 60904-3, which provides measurement principles and reference spectral irradiance data essential for CPV testing.
Applications
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Performance Rating of CPV Modules and Systems
Manufacturers and testing laboratories use IEC 62670-1 to determine accurate power ratings under recognized conditions, facilitating reliable product comparison and quality assurance.
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Data Sheet and Nameplate Standardization
Ensures that power output information is consistent internationally, supporting transparent communication among manufacturers, system integrators, and end users.
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System Design and Validation
Provides a baseline for engineers and developers to evaluate module behavior under both natural operating conditions and controlled test setups, streamlining the development of efficient CPV technologies.
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Certification and Compliance
Supports conformity assessments by providing test matrices aligned with global electrical and photovoltaic standards, which is crucial for gaining market access and consumer trust.
Related Standards
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IEC 62670 Series
- Part 2: On-Sun Measurements for Energy Yield and Performance Ratio – Focuses on practical field measurement methods for CPV arrays and plants.
- Part 3: CPV Power Assessment Methods – Details procedures for conducting power assessments both indoors and outdoors under standard conditions.
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IEC 60904 Series
- Particularly IEC 60904-3, for spectral irradiance reference and measurement principles relevant to terrestrial PV devices, underpinning the spectral conditions referenced in IEC 62670-1.
Summary
IEC 62670-1:2013 plays a vital role in the standardization of performance testing for CPV technologies, establishing internationally agreed conditions for evaluating power output. By providing clear definitions for concentrator standard operating conditions (CSOC) and concentrator standard test conditions (CSTC), this standard enhances comparability, reliability, and transparency in the CPV sector, aiding manufacturers, installers, and certification bodies alike.
Whether used for product development, system validation, or market certification, adherence to IEC 62670-1 ensures that CPV performance data is robust, reproducible, and consistent worldwide-advancing the broader adoption of efficient solar concentrator technologies.