Glass-glass module structures (Glass Glass or Double Glass) is a technology that uses a glass layer on the back of the modules instead of the traditional polymer backsheet. Originally double-glass solar panels were heavy and expensive, allowing the lighter polymer backing panels to gain most of the market share. Thanks to producers such as:
glass-glass is making a comeback, based on an increase in the market share of bifacial modules and an increase in the number of PV installations on a business scale and solar farms preferring more durable module designs such as glass-glass.
Double-glazed modules are characterized by increased reliability, especially for large-scale photovoltaic projects. They include better resistance to higher temperatures, humidity and UV conditions, and have better mechanical stability, reducing the risk of microcracks during installation and operation. Double Glass is especially important in photovoltaic facilities such as solar power plants and with the expected long service life of modules such as AKCOME, Jinergy or Jolywood.
An important change that has been made in the case of Glass-Glass modules is the replacement of EVA with polyolefins as an encapsulating substance. This is due to the free radicals generated during the EVA cross-link lamination process. While traditional backsheets are somewhat permeable to free radicals, the double glass module is not. The same can be said for moisture that can seep in from the sides of the module and get trapped in the double-glazed structure. Therefore, the impermeability of these degrading agents is a major argument against glass-to-glass as it traps both free radicals and moisture inside the module, potentially shortening its field life. The issue of trapped moisture is actually the main argument against double glass modules. Polyolefins are used as encapsulating substances, which solves the problem of free radicals and the problem of moisture is solved by the execution, which is confirmed by e.g. PVEL tests.
Double-glass modules are characterized by increased reliability, especially for large-scale photovoltaic projects. They include better resistance to higher temperatures, humidity and UV conditions, and have better mechanical stability, reducing the risk of microcracks during installation and operation. Double Glass is especially important in photovoltaic facilities such as solar power plants and with the expected long service life of modules such as AKCOME, Jinergy or Jolywood.
Due to the increased reliability of the double glazing unit design, they are expected to degrade only 0.4% per year on average, as opposed to the traditional polymer back layer at 0.7% per year. Therefore. over 30 years of operation, it can be expected to continue to operate at 85% of the rated power (some modules already reach over 87% after 30 years).
Long warranty for power production >30 Years
Highest Efficiency >22%
Low Yearly degradation, only >0,4%
Best Bifiaciality efficiency >85%
Lowest Temperature Coefficient 0,24%-026%/°C
Very low modules failure risk factor
HJT(ntype) bifacial efficiency can achieve even 27%. But usually producers like Acome and Jinergy use Heterojunction solar cells with 24%-25% efficiency. Compare to PERC Cell, HJT can achieve even 20% more power.
Bifacial HJT solar panels have the best efficiency in serial production. Scope of it is between 21%-22,5% with R&D plan even to 26%. N-type module has the best performance and most reliable characteristic resistance for most common fail from all over solar technology.
HJT with N-type technology solar Panels with 120 cells have a scope of power between 370W-390W and for 144 cells 425W – 470W. At the end of 2021 Power of HJT modules will achieve >500W and in soon future will be >600W.
N-type Bifacial technology ensures a long safe warranty for 30 years of production and 12 -20 years for a panel, depends on the producers. It’s more approx. 5 years than common PERC panels.
Bifacial HJT solar panels with N-type cells are value for money solutions. Compare with standard backsheet modules, the price for Heterojunction is a little bit more. But compared with Bifacial, glass-glass solar panels, HJT is the best solution and has more advantages worth a few % higher price.
Higher power, bifaciality, efficient production under extreme conditions, combined with the world’s lowest degradation, no LID and PID effects and a double glass structure (GLASS-GLASS), allows you to generate significant savings over 30 years of use compared to PERC panels.
Glass is the best protection for the silicon cells that are the heart of the photovoltaic module. A cell is a unit that generates electricity, but it is made of a delicate material that needs to be reinforced and secured externally. For this purpose, we have a good ally in the form of solar glass, which, in addition to being transparent, is an electrical insulator.
HJT PV team is not only a trusted advisor but solar panels broker. We are helping Clients from all over the world connect to trusted and checked HJT producers. Direct cooperation ensures the best prices and fast delivery, to all destinations.