The first studies on the degradation on PV modules performance begun in the seventies but only in the 2000s, with the widespread use of photovoltaic systems, the causes of the early decay of the module performance have been examined.
LID (Light Induced Degradation) is a first phenomenon of performance decay that affects the panel in the first moment of exposure to the sun; this phenomenon stops after some initial diminished performances and the module maintains its own characteristics within the warranty limits.
The second but much more heavier phenomenon is PID (Potential Induced Degradation) due to the difference in tension that is established between the cells and the frame of the modules.
The electric field that develops lead to two type of effects:
- the migration of sodium ions present in the glass toward the cells and the frame
- the polarization of the cells surface.
The first effect changes the characteristic of the cells themselves with a considerable reduction of the generated power, whereas the second effect can be undone by reversing polarity (for example at night).
Significant reduction of the PID phenomenon
The PID phenomenon is significantly reduced in the PV modules that have high quality quartz glass, which by their nature contains small concentration of sodium, with the optimization of the distances and of the EVA layer (the material that encloses the cells); it is thus important to rely on manufacturers of quality modules
In the Book Energetic Systems 4.0 dedicated section
This topic is presented in the section dedicated to photovoltaics on the book “Energetic Systems 4.0 innovative technologies for buildings and mobility” published by VP Solar engineers with the aim to lead resellers, installers and designers towards the evolution of the energetic systems’ market.
VP Solar has also dedicated specific services to support the revamping activities for the technical and product choices when the performances of a PV installation in operation need to be improved
Hyundai, PV Modules
Hyundai HiE-SxxxHG – mono PERC – 435 Wp
Hyundai HG series photovoltaic modules with G12 cells and Shingled Technology are ideal products for residential systems with excellent performance and efficiency even in the event of partial irradiation.
- Efficiency up to 21.4%
- 25-year warranty on both product and performance
- Black frame
- 320 Cells, monocrystalline PERC Shingled (210 x 210mm)
- Available sizes: 435 Wp
Jinko Solar, PV Modules
Jinko Solar Tiger Neo N-Type JKMxxxN-54HL4-V – mono – 108 halfcells – 425Wp
Photovoltaic module with Tiger Neo N-Type technology offers high efficiency and quality.
- Positive power tolerance of 0~+3%
- 15 Year Product Warranty and 30 Year Linear Power Warranty
- Sizes available: 425 Wp
Jinko Solar, PV Modules
Jinko Tiger Pro 54HC – JKMXXXM-54HL4-V – mono – 108 half cut cells – 405/410WpJinko Solar, PV Modules
Jinko Tiger Pro 54HC – JKMXXXM-54HL4-V – mono – 108 half cut cells – 405/410Wp
Jinko Tiger Pro JKMXXXM-54HL4 P-type monocrystalline photovoltaic module.
- Multi Busbar technology;
- Snow (5400 Pa) and wind (2400 Pa) resistance;
- Anti-PID resistance;
- Available sizes: 405/410Wp.
Hanwha Q CELLS, PV Modules
QCells: Q.PEAK DUO ML-G11S Series – mono – 132 celle – 490/510 Wp
Q.PEAK DUO ML-G11S series is a 132-cell, 6 × 22 half-cell monocrystalline photovoltaic module with Q.ANTUM DUO Z Technology
- efficiency higher than 21%
- 12-year product warranty and 25-year performance warranty
- In the Q.PEAK DUO ML-G11S+ SERIES version 25-year warranty on everything
- Available: from 490 to 510 Wp
PV Modules, Sharp
SHARP NU-JC – mono PERC – 375 Wp
PV monocristalline modules with 120 half-cell for residential and commercial rooftop photovoltaic systems, optimized for long-term reliability and performance.
- High module efficiency (20.3%)
- 9 busbar technology
- Positive power tolerance (0/+5%)
- 25 years linear power output guarantee and 15 years product guarantee
- Available: 375 Wp