Overview
IEC 62788-1-1:2024 provides internationally recognized measurement procedures for characterizing the properties of non-rigid polymeric encapsulants used in terrestrial photovoltaic (PV) modules. Issued by the International Electrotechnical Commission (IEC), this standard specifically addresses materials such as poly(ethylene-co-vinyl acetate) (EVA) and other similar polymers that serve as encapsulants-critical components for the long-term durability and performance of PV modules. The standard outlines comprehensive test methods and mandatory reporting requirements for the optical, mechanical, electrical, thermal, and chemical characteristics of these materials, ensuring a consistent approach to material assessment for industry stakeholders.
Key Topics
- Material Characterization: Defines procedures to evaluate essential properties including transmittance, UV cut-off, adhesion, hardness, volumetric resistivity, and water vapor transmission rates.
- Representative Testing: Specifies that encapsulant materials should be tested as they would be used within modules, in conjunction with other components like frontsheets, backsheets, adhesives, edge seals, and glass.
- Standardized Reporting: Introduces a universal characterization form (UCF) and datasheet reporting requirements, facilitating clear communication of key material properties across the PV value chain.
- Quality and Reliability: Supports both design and manufacturing quality control by offering methods applicable for incoming/outgoing inspection, safety and qualifications testing, and reliability studies.
- Supplementary to Module Tests: Complements module-level safety and performance testing as described in IEC 61730 and IEC 61215 standards.
Applications
IEC 62788-1-1:2024 is relevant to a broad range of applications in the renewable energy sector, especially within the photovoltaic materials supply chain:
- Material Selection and Research: Aids in selecting suitable encapsulants for new PV module designs by providing standardized and comparable material data.
- Manufacturing Quality Control: Supports process control through repeatable test methods that can be used for batch acceptance or process optimization.
- Safety and Type Qualification: Ensures that encapsulant materials meet industry safety and durability requirements, which is essential for achieving module certifications.
- Product Datasheet Preparation: Enables manufacturers to provide clear, verifiable, and standardized technical specifications for PV module encapsulants.
- Reliability and Durability Studies: Assists in assessing potential changes in material performance under accelerated aging, environmental stress, or combinations with other module components.
- Regulatory and Standards Compliance: Helps manufacturers demonstrate compliance with global PV module requirements and assists in meeting local or national regulatory needs.
Related Standards
When implementing IEC 62788-1-1:2024, related standards and references provide additional context and complementary procedures:
- IEC 61215 – Design qualification and type approval for terrestrial PV modules
- IEC 61730 – PV module safety qualification and testing
- IEC 62788 series – Other parts cover related materials (frontsheets, backsheets, edge seals), specific test methods, and accelerated aging
- IEC 60112 – Proof and comparative tracking index for solid insulating materials
- ISO 489, ISO 62, ISO 291, ISO 11357, ISO 15106 – Standardized methods for measuring properties such as refractive index, water absorption, thermal/optical properties, and vapor transmission
- ASTM D2240 – Durometer hardness for rubbery materials
For a complete understanding of encapsulant measurement, users are encouraged to consult these standards in conjunction with IEC 62788-1-1.
Implementing IEC 62788-1-1:2024 ensures that encapsulant materials for PV modules are tested and certified for quality, reliability, and compatibility, thereby enhancing the overall safety and performance of photovoltaic systems. This standard is a vital resource for manufacturers, testing laboratories, and R&D teams striving for excellence in PV module production and material selection.