here are different quality labels in the market. For the end user, it is often difficult to see by which organisation they were issued and for what criteria.
Sharp solar modules offer the following quality seals:
IEC: Issued for safety, quality and durability (IEC/EN 61215 and IEC/EN 61730) by the International Electrotechnical Commission (IEC). TÜV and VDE carry out these certifications, among others
ISO: Issued for quality standards (ISO 9001) and environmental standards (ISO 14001) by the International Organization for Standardization (ISO).
CE: The manufacturer declares that the product complies with the European directives.
MCS: Accreditation for sales in the UK