How temperature affects the efficiency of solar power generation?

Nowadays, many people are very interested in photovoltaic power generation. Some families have installed photovoltaic power stations. Not only do they not need to pay electricity bills for their own electricity use, the electricity bureau will purchase the excess electricity that cannot be used and pay the electricity bill directly into your personal account. So do you know how temperature affects the power generation of your photovoltaic plant? The amount of power generated will directly affect your income. The following editor will explain the relationship between temperature and photovoltaic power generation efficiency in detail.

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, solar panels become less efficient the warmer they get. After all, solar panels convert light energy into electrical energy, not heat into electrical energy.

When the cell absorbs light, it can quickly generate electron holes. Positively charged holes and negatively charged electrons can move in two different directions respectively, and then generate current and voltage. If the electrons and holes recombine, then it will convert the solar energy efficiency. The temperature will therefore be lowered, the faster the electrons and vacancies recombine. The higher the temperature and the solar panel will have no benefit. For example, if it is too humid, the adhesion will decrease due to moisture, electrode delamination will occur in the battery and adhesive, and we can not make electrons fill smoothly, resulting in black spots and connector abnormalities.

In addition to hot weather, huge temperature differences are also a major factor in solar panel performance, with solar panels reaching temperatures as high as 80 degrees Celsius in some places under a hot sun, and as low as 15 degrees Celsius by midnight. Thinner, smaller solar cells are more susceptible to rupture. In the manufacturing process of solar modules, we use copper strips and bus bars (also called main rods and thick wires) to connect solar cells in series and assemble solar modules. However, the quality of welding will affect the power generation efficiency of silicon solar modules. In addition, as the thickness of silicon wafers becomes thinner, breakage is more likely to occur during the welding process of solar modules.

In the manufacturing process of solar modules, we first weld the solar cells with foil strips. Then we stringe the cells into a group with foil strips, and finally enter the packaging process. But a kink, or kink, occurs when a string of wires passes from a negative terminal at the top surface to a positive terminal at the bottom.

Can new technologies solve the impact of temperature on efficiency?

But as technology advances, can new technologies solve the impact of temperature on efficiency? Scientists believe that new back contact (back contact) electrodes such as selective laser welding (ive laser welding) back contact (back contact, BJBC) technology solve this challenge. The battery, bus lines and fine lines on the back of the BJBC PN junction refer to the intersection, and the battery electrodes and junction on the back of the battery, the battery is like pure darkness facing the sun, which can reduce the bus lines and shadows on the front and improve conversion The thin lines of efficiency can also optimize the light surface passivation effect by improving the process, and there are also beautiful advantages.

Selective laser welding is to evenly weld the connecting wires to the battery to improve stability. It can also reduce mechanical damage to the welded joints. Unlike conventional batteries, the current in a BJBC battery 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 busbars and shortening the length of thin wires. We can improve the filling factor and short-circuit current density of BJBC solar cells, thereby helping to improve the performance of solar panels.

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Above all, these are the relationship between temperature and photovoltaic power generation efficiency. If you are interested in knowing or discussing more, please feel free to contact and share.