What is a double-sided double-glass module?
Bifacial modules, as the name suggests, are modules that can generate electricity from both the front and the back. When sunlight hits the bifacial module, part of the light will be reflected by the surrounding environment to the back of the bifacial module, and this part of the light can be absorbed by the battery, thus making a certain contribution to the photocurrent and efficiency of the battery.
Compared with conventional monocrystalline cells, double-sided photovoltaic modules can generate electricity under the direct sunlight on the front and the reflected light from the sun on the back.
Double-sided double-glass modules
According to the packaging technology of double-sided cells, it can be divided into double-sided double-glass modules and double-sided (with frame) modules. The structure of double-sided double-glass modules includes: double-layer glass + frameless structure; double-sided (with frame) modules adopt Transparent backplane + border form, etc. The mainstream double-glass double-sided modules have the advantages of long life cycle, low attenuation rate, weather resistance, high fire rating, good heat dissipation, good insulation, easy cleaning, and higher power generation efficiency.
Influencing factors of power generation gain
The most important factors for the power generation gain of bifacial modules are: the surface reflectivity and the installation height of the modules. Direct solar radiation and scattered light will be reflected after reaching the ground, and some will be reflected to the back of the module.
Compared with conventional single crystal modules, double-sided double-glass modules have the following advantages:
Functional level: longer life cycle
PERC double-glass double-sided modules integrate the anti-PID characteristics of double-glass modules, and have the advantages of high efficiency and low-cost systems suitable for harsh environments and 1500V. The average attenuation is lower than that of ordinary modules, so the service life is longer.
In addition to attenuation, the low-light and temperature characteristics of the components are also critical.
Low-light performance: Excellent low-irradiation performance allows the power station to work earlier and stop working later, thereby increasing the power generation gain.
Temperature characteristics: The glass structure of the double-glass double-sided module has stronger wear resistance and corrosion resistance, and the water permeability is almost zero. Various application environments such as desert and seaside