1. The service life of photovoltaic modules under normal conditions is no less than 25 years, and the module power standard strictly complies with the relevant requirements in TUV IEC 61215 and IEC 61730. The output power shall not be less than 80% of the standard power within the 25-year service life.
2. From the perspective of photoelectric conversion efficiency parameter decomposition, monocrystalline cells have a higher power generation efficiency. Generally speaking, under the current technology, the mass production efficiency of monocrystalline cells in China is around 20.2%, while PERC can reach 21.2%-21.5%; the mass production efficiency of polycrystalline cells is generally around 18.5%-19%.
3. The modules use Grade A standard solar cell packaging (EL imaging shows no defects, the surface color of the cells in the modules is uniform and consistent, there is no mechanical damage, and the solder joints are free of oxidation spots).
4. Each cell and interconnecting strip of the module should be neatly arranged, and the module frame should be clean and free of corrosion spots.
5. No air bubbles or delaminations are allowed in the encapsulation layer of the module to form a path between a cell and the edge of the module. The geometry and number of air bubbles or delaminations should comply with the relevant product specifications.
6. The insulation resistance of the components under normal conditions shall not be lower than 200MΩ.
7. The light-receiving surface of photovoltaic cells should have good self-cleaning ability; the surface corrosion resistance and wear resistance should meet the relevant national standards.
8. For modules using EVA, glass, and other laminated encapsulation materials, the cross-linking degree of EVA should be 75-85%, and the peel strength between EVA and glass should be greater than 50 N/cm. The peel strength between EVA and the module backsheet should be greater than 40 N/cm.
9. The contractor shall provide photovoltaic module test data, TUV-calibrated standard parts for calibrating test equipment, and test standard STC (T=25℃, 1000W/m2, AM1.5).
