PERC Technology
In PERC technology, by adding an additional passivation layer to the traditional cell architecture, free electrons trapped in the solar cell, with reduced mobility due to density, accelerate and provide more efficiency per unit area. This technlogy is also suitable for bifacial modules.
Multi Busbar Technology
Busbars are thin conductors located above and below the cell. They are processed by printing technique on the PV material during the cell manufacture in order to collect and transmit the electricity produced in the cell. By commonly accepted definition, using 9 or more busbars to indicate the difference compared to the previous technology using 3 to 6 busbars is called Multi Busbar.
Increasing the number of busbars augments the mechanical strength of the cell, its resistance to micro-cracks and the performance of harvesting free electrons produced in the cell. The increase in the number of busbars (and the thinner conductors, called fingers) connected to them, reduces the conductor losses by shortening the path that the free electron will follow to join the electrical circuit, and also helps to reduce costs by using a thinner conductor, hence less material.
Half – Cut Technology
VES PV Modules are manufactured from half-cells obtained by precisely dividing a full PV cell into two using a laser beam. Half cells are used twice the number of cells used in a standard module of the same dimensions..
By connecting these half cells in series, two independent arrays of equal size are formed, one in the lower half of the module and the other in the upper half. These arrays are connected parallel to each other at the midpoint of the module and form a complete one. Between these two halves, the short-circuit (bypass) diodes, located at the midpoint of the module, turn off the part that has lost production by allowing the current to continue on its way. Thus, it prevents the output loss of the entire module when the production decreases due to shadowing in the part of an array connected in parallel to the diode. In this way, it is ensured that the loss due to the shadowing effect is on the order of 30-40% less than in a standard module.
Since the solar cells are divided into two, the current produced by each cell will also be divided into two, thus reducing the resistance loss on the conductors by four times. Half-cut solar cells have lower internal resistance.
Thus, power drops due to internal resistance are also less.
In half-cut panels, the hot spot area that will occur due to partial shading and the amount of heating due to the current will be less and will prolong the modules lifespan.
Since Thanks to 3 junction boxes used in half-cut panels conductor losses are reduced and heat is distributed to three separate points compared to standard modules with single junction box.
Wire Tab Ribbon
Cell ribbons (Tab ribbons) that provide serial connection to form strings from cells are chosen as round wire conductors in VES PV Modules. With flat conductor technology, the benefit of the light reflected back from the glassair interface after it is reflected from the ribbon is limited. On the other hand, the round cross-section conductor, thanks to its geometry, increases the efficiency by allowing the light reflected back from different angles to reach the cell surface.
Bifacial Technology
Bifacial (double-sided) modules can receive light from both sides, thus harvesting energy from the back side of the module on surfaces with an appropriate albedo value, where the light can be reflected back at a high rate. In the most ideal conditions, they can provide an additional gain of 25%.
With its bifacials modules, VES offers a suitable option for installations on white sand, gravel and snow-like fields. It is also a suitable solution for structures such as greenhouse, glass swimming pool roof.
