Progress in photovoltaics has been accelerating enormously over the past few years. Manufacturers of photovoltaic panels are increasingly racing to come up with new solutions. An example of this race and a novelty on the photovoltaic market are bifacial panels.
Double-sided modules have been developed mainly to withstand the harshest weather conditions. In addition, energy producers were able to achieve much higher energy efficiency with little more money. Another advantage of these photovoltaic panels is their longer service life. The linear power drop guarantee for bifacial panels is up to 30 years.
In traditional photovoltaic panels, the front layer is covered with glass and the back layer is protected with a special film, while bifacial panels are distinguished by the fact that the front and back layer of the photovoltaic module is used, i.e. glass under which silicon wafers are located is at the front and back of the module. Hence, double-sided modules are also called glass-glass panels.
In their research, the Solarworld company presented that a 330 Wp bifacials can produce the same amount of energy as a traditional 410 Wp module, which together gives us about a 25% increase in generated energy.
Unfortunately, double-sided panels also have their “disadvantages”, if we can call them that, namely that they can only be mounted on the ground or on a flat roof. There are three ways to mount double-sided panels:
Of course, apart from the installation method, there are several other factors which have a direct influence on the efficiency of the modules:
White surfaces are the best sun rays reflectors. Below are the percentage albedo coefficients for white surfaces.
However, it is not only white surfaces that can help us with higher energy yields for double-sided panels, as shown below:
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