We are working for more than 10 years in the solar industry, and here are the main problems that we are heard from Solar PV project installation, and how to avoid it.
1.Hot spots on the panels
Reason: Hot spots on the panels are mainly due to the high resistance of the cells because of a bad welding process between the bus bar.
Consequence: Bad welding connections cause low resistance in the part of the panel that receives the power generated by the cell. As a result, hot spot panels can lead to short-circuiting, reduces the performance and lifespan of the PV panel, or damage the EVA and back sheet and catch fire. Most of the time panels need to be replaced and that adding extra cost to your project.
Solution: A strict process of production and quality control from a reliable supplier is mandatory to avoid this phenomenon. The welding machine is the key element in the production line, so make sure that your supplier has a full automotive factory with a good welding machine brand, In-Process Quality Control standard, and intern SOP.
Reason: Micro-cracks are mainly due to poor quality cells, a problem during the PV module production, a problem during shipping (due to low-quality packaging and bad container loading) or bad handling of the panels during unloading of the container or installation of the panels.
Consequence: Cell in the panels are wired in series, so micro-cracks will influence all your module efficiency and all your systems, with a lost performance of around 2-3%. Most of the time, in this case, it’s recommended to change the panel.
Solution: Work with an experienced and reliable supplier. Make sure the quality of the cells used is Grade A, and that they respect a high standard of out-going quality control. make sure also the packaging used is at least 2 waves layout and that your panels are well packed before loading.
3. Panels Oxidation, Snail trail contamination
Reason: EVA content additive to resist to UV ray. In case of bad quality EVA or bad storage (of the cells or the finished panels), your module can become yellow or brown. The defective EVA can lead to moisture in the panel, and as a result of this moisture, oxidation can occur between the EVA and the back sheet.
Consequence: Lower efficiency of your panel, that will reduce the efficiency of all your systems or project. It’s recommended to change the panel in this case.
Solution: Make sure your panels content good quality EVA from top brand supplier, and that your supplier has a strict process of In-coming Quality Control (IQC), to test each raw material received.
4. PID Effect
Reason: PID means ‘Potential Induced Degradation’. This negatively affects the cells of PV modules. It is a process which occurs only a few years after installation. PID causes an accelerated degradation in performance which expands exponentially.
Consequence: The main consequences are a reduction of the performance of your panels and an acceleration of the ageing of your PV module.
Solution: Make sure to work with supplier certified TUV SUD standard 2016 (IEC 61730 and IEC 61215), as well as PID free certification, provide by TUV SUD.
5. Internal corrosion, delamination
Reason: Internal corrosion happened when moistures penetrate inside the panel. The layout of the solar module (Glass, EVAx2, Cells, Backsheet) MUST be air and water-tight, so during the process of production, we have laminated the module components under Vaccum. If there is a problem during the lamination process or if the lamination is too short, it can lead to delamination or moisture in the panels.
Consequence: Corrosion in your PV module will lead to a reduction of the panel production, and will affect all your systems production.
Solution: One more time, make sure to work with a reliable supplier, that use a good brand lamination machine, and which have a good process of production and good SOP for their employee. Any problem during the lamination process needs to be identified and fixed by factories workers. Make sure also that your supplier has all corrosion certification such as Salt Mist corrosion level 6, or Ammonia corrosion.
Don’t hesitate to contact our Eco Green Energy Team for more information about our factory, process of production, quality raw material and panels quotation. At Eco Green Energy, we try to find the best balance between quality and price.
email@example.com for more details on that subject.