Recently, multiple series of OSDA photovoltaic modules successfully completed cyclic (dynamic) mechanical load testing conducted by TÜV Rheinland in accordance with IEC TS 62782:2016. The test outcome was rated “Pass,” providing further third-party evidence of the modules’ mechanical reliability and durability under cyclic alternating loads.

The TÜV Rheinland test report covers multiple OSDA TOPCon crystalline-silicon PV module series with a maximum system voltage of 1,500 V.

Dynamic Mechanical Load Testing Better Reflects Repeated Loads in Field Operation

Static mechanical load testing is one of the mechanical reliability assessments performed under the IEC 61215 series. It is intended to verify a module’s ability to withstand specified positive and negative loads for defined durations.

In actual PV power plant environments, however, the mechanical loads applied to modules are not entirely static.

Variations in wind speed, gusts and turbulence can subject modules to repeated positive pressure and negative suction. The operation of tracking systems may also introduce periodic vibration, while temperature fluctuations and mechanical interactions between modules and mounting structures can result in continued bending and stress variations.

Under IEC TS 62782, the module is mounted at its designated support points and subjected to a uniform load normal to its surface, alternating between positive and negative directions. The test is intended to assess the resistance of critical module components—including solar cells, interconnect ribbons, electrical interconnections and edge seals—to damage or fatigue caused by repeated mechanical stress.

Compared with static load testing alone, cyclic dynamic mechanical load testing provides an important complementary assessment of module reliability under repeated loading conditions.

Six Representative Module Models Tested

According to the TÜV Rheinland test report, six OSDA module models were selected to represent different product structures and material configurations:

· ODA710-33V-MHD

· ODA610-33V-MHDRz

· ODA755-78NTS-DGR

· ODA740-66NTZ-DG

· ODA600-36V-MHD

· ODA595-36V-MHD

The assessment covered visual inspection, maximum power determination, insulation testing, wet leakage current testing and electroluminescence (EL) inspection. According to the report, the tests were conducted using the method specified in IEC TS 62782:2016, and the results met the acceptance criteria applied in the test report.

The test conclusions apply only to the module models and material configurations explicitly identified in the report.

Additional Reliability Validation for Large-Format Modules

As PV modules evolve toward larger formats, higher power ratings and thinner glass, their ability to withstand repeated mechanical stress in field operation is receiving increasing attention from project developers, EPC contractors and investors.

Large-format bifacial glass-glass modules can support higher power density, bifacial energy-yield gains and balance-of-system cost optimization. At the same time, these designs impose more demanding requirements on the compatibility between module structures, mounting systems, clamp positions and installation methods.

Module reliability depends not only on individual components, but also on whether the module, mounting structure, clamps and installation method function together as a stable system. Strict compliance with the specified clamping zones and installation methods in the module installation manual is essential for reducing the risks of glass breakage, cell microcracks and long-term performance degradation.

Continuously Strengthening the Product Reliability Validation System

The successful completion of IEC TS 62782 cyclic dynamic mechanical load testing represents another important milestone in OSDA’s continued development of its product reliability validation system.

In addition to meeting fundamental design qualification and safety requirements, OSDA continues to conduct targeted reliability testing to further assess module performance under demanding operating conditions. These efforts provide additional product validation evidence for utility-scale PV plants, tracker-based projects and other applications involving elevated mechanical loads.

Looking ahead, OSDA will continue to advance product development and quality management with a focus on high efficiency, high reliability and full-lifecycle value, delivering stable and dependable photovoltaic products and energy solutions to customers worldwide.