Now many families are very interested in photovoltaic power generation, some families have installed photovoltaic power plants, not only do they use electricity without paying the electricity bill, the excess electricity that can not be used will be acquired by the electricity bureau, the electricity bill directly into your personal account. So do you understand how the temperature affects the power generation of your photovoltaic power plant? The amount of electricity generated will directly affect your income, the following small details for you to explain the relationship between temperature and photovoltaic power generation efficiency.
Is solar energy suitable for use in areas with high temperatures? Solar panels are also electronic components, and as temperatures rise, their efficiency decreases. As with many electronic devices, the higher the temperature of solar panels, the less efficient they become. After all, solar panels convert light energy into electricity, not heat into electricity.
When the cell absorbs light irradiation can produce electron-hole, positively charged holes and negatively charged electrons can be in two different directions, then produce current and voltage If the fast electron and hole compound, the solar energy conversion efficiency will therefore be reduced, the higher the temperature, the faster the speed of the electron and hole compound, high temperature and solar panels have no benefit. For example, if the weather is too humid, adhesion will be reduced because of humidity, the cell and adhesive will be delaminated electrodes, electrons can not be injected smoothly, resulting in black spots and connector anomalies.
In addition to hot weather, huge temperature differences are a major factor in the performance of solar panels, which can reach up to 80 degrees Celsius in some places under a hot sun and can drop to 15 degrees Celsius by midnight. Thinner, smaller solar cells are more likely to break. In the manufacturing process of solar modules, solar cells are assembled using copper tape and bus bars (also called main bars and thick wires) in series. However, the quality of the soldering affects the power generation efficiency of silicon solar modules. In addition, as the thickness of the silicon wafer becomes thinner, it is more likely to break during the welding process of the solar module.
In the manufacturing process of solar modules, solar cells are first welded with foil strips, then the cells are strung together in groups with foil strips, and finally enter the packaging process. But kinking, or kinking, occurs when a string of wires passes from a negative terminal at the top surface to a positive terminal at the bottom.
But as technology advances, can new techniques address the effects of temperature on efficiency? Scientists believe that new backside contact (backside contact) electrodes solve this challenge, such as selective laser welding (ive laser welding) backside contact (backside contact, BJBC) technology. bjbc pn junction backside of the cell, bus lines and fine lines refer to the intersection, and the cell electrodes and junction backside of the cell, the cell is like pure darkness facing the sun, can reduce the front bus lines and shadows, increasing conversion efficiency of the fine lines, but also by improving the process to optimize the light surface passivation effect, there are beautiful advantages.
Selective laser welding is the uniform welding of connecting wires to the cell to improve stability and reduce mechanical damage to the welded joints. Unlike conventional cells, the current in a BJBC cell does not pass through the emitter, so there is no choice between thick and thin wire shading and series resistance losses. Past experiments have also found that by omitting the bus bars and shortening the length of the thin wires, the filling factor and short-circuit current density of BJBC solar cells can be improved, thus contributing to better solar panel performance
