At sudden, quite several sellers have appeared Solar Panel in Pakistan. Unfortunately, many of them do not have the proper degree of competence on this area and offer low-great sun modules crafted from recycled and coffee-high-quality substances. Generally, these modules of little-known agencies imported, but amongst them there are different producers, or as a substitute assemblers of sun modules. Beneath we will attempt to solution the most vital questions when deciding on a sun module.
EVA laminating film
One of the most critical components in the module, which determines the life of the sun module. Relying at the producer, EVA laminating film has a provider existence of 5, 10, 20, 25 or extra years. Reasonably priced and occasional-satisfactory EVA, which is very often utilize from the unscrupulous producers, commonly has a lifespan of 5-10 years. After this period, and regularly lots earlier, the film starts to grow to be cloudy, turn yellow or peel off below the influence of UV rays and temperature changes.
- Polycrystalline solar panel
- Solar battery polycrystalline
The efficiency of the module decreases, and the tightness broke. This substantially reduces the output of the solar module or leads to its entire failure. The EVA laminating movie is located at the back and front sides, ensuring the tightness of the module and high transparency of the front aspect of the module at some stage in operation. Unfortunately, even a professional will now not be able to distinguish between a module product of low best or fine EVA, simplest time will tell. It recognized that the distinction in charge between great and coffee-first-class EVA can fluctuate by means of 2-4 instances. Maximum suppliers of Chinese modules have no concept what type of EVA laminate their factories use.
PET Back sheet.
Pet offers protection and tightness of the solar module from the lower back. Commonly white or black. Relying on the thickness of the insulation, puppy offers the most voltage of the modules, typically 600 V or a thousand V. This record is likewise display in the technical specifications of the solar module. Regarding the carrier life, the situation is the same as with the EVA laminating movie. The cheaper, the shorter the lifespan. On the stop of the carrier existence, the lower back movie starts to show yellow, crack or peel off, the tightness broken, the solar module fails.
Solar cells are divided into 4 quality categories
Grade A is the primary category of first-class. This class of elements does no longer allow any, even the maximum minor defects. Factors of this class, typically, have medium and excessive efficiency of 16-19% or extra. FSM solar modules use most effective Grade A elements.
Grade B the second category of fine. Factors of this category also, in most cases, have medium and high efficiency of sixteen-19% or more. But category B elements constantly have visible defects. The presence of Grade B factors slightly influences the power and operation of the module,
Comparison of 2 mono solar cells
Grade C and Grade D. We have not simply mixed these classes into one, due to the fact. It’s far the factors of these fine classes that are absolutely considered improper for use in sun modules, that’s correctly used by unscrupulous assemblers of “producers” of modules. It is these solar modules which might be now actively bought at dumping low charges underneath the guise of super sun modules.
Factors of those exceptional classes have chips, microcracks, plus they may have the identical defects as Grade B elements. Such elements bought, reduce, complete elements left, and modules soldered from them. Traditionally, such elements characterized by low efficiency of 12-15%. In fact, this is waste, (scrap) that recycled by manufacturers of awesome solar modules. It must refer to that no self-respecting module manufacturer will make solar modules from their rubbish, however, such modules are already brought. The price of solar cells in a module is more than 50%, producers of sun modules from Grade C and D cells purchase this material for after not anything, thereby considerably lowering the price in their merchandise.
In sun modules from Grade C and D factors, there may be constantly more soldering, because. The quantity of elements is a whole lot greater (on common 2 instances) than in remarkable modules made according to conventional identified era. Extra soldering approach much less reliability and durability of the module. Terrible soldering can motive a quick circuit on the factors and cause the “warm spot” impact (see parent underneath).
Short circuit on the solar cell
A conscientious producer continually types solar cells earlier than manufacturing a module. In sun modules from Grade C and D elements, this normally does no longer happen, because. The producer of such modules assembles whole components of solar cells from what’s to had. A fraction of one of these solar modules prove in the determine beneath.
Solar Modules Grade C and D
It’s miles a famous reality that if a sun module has at least one solar mobile of decrease power than all the others, all sun cells, without exception, will “line up” alongside the weakest element, and if the difference in modern-voltage characteristics is very vast, this could result in the formation of a “warm spot” effect (nearby overheating).
In case of nearby overheating in excessive-voltage systems (2 hundred-1000 V), the temperature of the solar cellular can attain three hundred C, overheating of the solar cellular will lead to its speedy degradation (electricity reduction), local delamination of EVA and puppy is feasible, and in the long run this may absolutely do away with the module from building.
The “warm spot” effect is likewise observed with microcracks at the elements, which can constantly found in C and D grade elements. Therefore, in Europe and the United States modules from C and D grade elements aren’t advocated to mounted in sun strength structures. The results of the “hot spot” impact are proven within the parent underneath.
How to identify a solar module made from grade C and D elements?
There are only few Best Solar Panel company in Pakistan that provide the genuine and pure material solar panels. As referred to in advance, the satisfactory of the EVA laminating movie, the pet back movie cannot decided even by using an expert, simplest time will tell, but, figuring out a sun module crafted from damaged C and D grade elements is easy.
Main features of solar modules made from C and D grade solar cells:
Under compares sun modules made from Grade C and D factors. Solar modules crafted from Grade a first great factor. The difference is apparent, Grade C and D solar module made from 72 solar cells, Grade A of 36 cells. Additionally take note of the quality of the soldering on the Grade C and D module (lower proper corner of the 50W module). The first-class speaks for itself, the elements “dance”.
Negative module efficiency
Solar modules from Grade C and D are constantly less efficient. Than modules made from first-class Grade A solar cells, respectively. Grade C and D usually weigh greater and have a bigger length for the same or less energy.
Be aware of the guaranteed responsibilities of the module supplier. Providers of amazing sun modules normally have a assure for assembly and materials for as a minimum 10 years.
When choosing a solar panel, pay attention to our recommendations. This will help you avoid buying a low-quality solar module made from production waste.