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How To Calculate The Power Generation Of Two-sided Components?
- Jun 27, 2018 -


Both home and abroad, a component manufacturer has announced the capacity planning of double side components, and buyers are starting to consider the power gain of the dual side components. According to independent calculations, in Germany and other countries, double-sided earnings growth of up to 15% or more can be achieved. Most of the component businesses have been selling double sided components, and photovoltaic power stations with double-sided components have also been built around the world. It is expected that both sides will rise in the solar market and occupy a very prominent market share.


But many practitioners do not know what specific benefits they can get from these components and how to optimize the system. After all, the simplest way to replace components is impractical.


The two-sided components can capture the light on both sides of the component, thus generating electricity on both sides. The power generation capability on the back is the key to the component's power generation.


Christian Reise, a senior scientist, has predicted the yield of double-sided batteries for many years, and he believes that the gain of 5 to 15 percent is a realistic target for large factories. At the same time, he emphasized that the additional output is not only the contribution of two sided components, but also depends on the system design.


In order to make full use of the power generation capacity of the dual side components, the components must be simulated in a specific environment to prove that the additional cost of the dual side components relative to the common component is reasonable. But in fact, the new components make these simulations more complicated: the sun's location and the area of the radiation on the front side of the component were considered, and the projection of the installation system and the component itself and the reflection on the ground were also considered. How does the reflectivity change over a year? Summer green grass, winter hay, snow and frost will increase the difficulty of simulation of two-sided components.


For many manufacturers, it is still not easy to find double-sided parameters on the specification table simply. However, how to present two sides on the specification sheet is currently being standardized. At the same time, Reise recommends that both sides of the measuring components need to build independent solutions. This involves covering the side under standard conditions while testing the other side.


A simple and crude method of measurement that is welcomed by the manufacturer is that if the dual 300W component produces more than 5% power due to light from the back, it is a component of 315 watts. In fact, it is very important to know how much back intensity is needed to increase output by 5%.


The efficiency of the double side component is less efficient than the front. In addition, the relationship between the power output of the component and the light input is not completely linear. Therefore, it is more accurate to irradiate the double side components with more power when the front is in high light input. Nevertheless, this does not mention the optical absorbability on the back side. Therefore, Reise proposes that, as a future standardized measurement, the light from the light source will be guided synchronously to both sides through the mirror. With the help of filters, even the power of the rear side can be determined even at a smaller irradiance. Using multiple filters that gradually reduce the irradiance level, a clear power curve can be formed on the back of the component.


It is also noteworthy that the frontal power generation capability of the double - sided module is actually slightly lower than that of the same single side components in the other parameters, which is due to the internal reflection of a single white backplane that produces a few watts of additional power.