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How solar modules affect solar power generation?
- Jul 13, 2018 -

With the rapid development of solar power generation, the application of solar power generation is becoming more and more widely. What are the factors that can affect the power generation of solar modules?

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1. The quality of solar modules

Due to factors such as cell cracking, black core, oxidation, and virtual soldering, as well as material defects such as backplane and aging of long-term use, the power of the component is affected during long-term operation, resulting in low power generation of the module. It is noteworthy that the crystal structure of the single crystal determines its superior performance in resisting cracking.

2. PID effect

During the long-term work of the external components, the water vapor permeates into the interior of the module through the backing plate, causing the EVA to hydrolyze. The acetic acid ions cause metal ions to precipitate in the glass, resulting in a high bias voltage between the internal circuit and the frame of the module, resulting in electrical degradation. The amount of power generation has dropped dramatically.

3. Component installation method

From the total amount of solar radiation on the inclined surface and the principle of direct dispersion of solar radiation, the total amount of solar radiation Ht on the inclined surface is composed of the direct solar radiation amount Hbt sky scattering amount Hdt and the ground reflected radiation amount Hrt, namely: Ht = Hbt + Hdt + Hrt. In the same geographical location, due to the difference in the installation angle of the components, the cumulative amount of absorption of sunlight is different, and the cumulative difference in the amount of radiation causes a difference in power generation.

4. Weather factors

The weather is also one of the factors that affect the power generation efficiency of the components. In the rainy weather and thicker clouds, the intensity of sunlight is reduced, the solar light absorbed by the cell is less, and the power generation is reduced. The low-light response of single crystal is better than polycrystalline under low irradiation. In the case where the conversion efficiency of the solar cell module is constant, the amount of power generated by the photovoltaic system is determined by the radiation intensity of the sun. The amount of electricity generated by a photovoltaic power plant is directly related to the amount of solar radiation. The radiation intensity and spectral characteristics of the sun change with meteorological conditions.

5. Shadow shielding

Components in the process of work due to the shadow part of the shelter and the settlement of dust, bird droppings pollution with differ degree can lead to "hot spot" effect, obscured parts will not provide power contribution and inside the component load and energy consumption at the same time cause local temperature component, overheating areas can lead to EVA to speed up the aging become yellow, make the light transmittance declines, so that the hot spot deteriorate further, leading to the failure of the solar cell components.

6. Temperature coefficient

The temperature coefficient of crystal silicon is commonly 0.4% ~ 0.45% / ℃, and single crystal temperature coefficient is smaller than that of polycrystalline. The change of the external environment temperature and the heat generated by the components in the working process will cause the temperature of the components to rise and the power generation of the components to decline.

7. Cleaning and maintenance

When the components are in the field for a long time, dust and other debris will fall on the glass, and a large amount of dust or dust will settle for a long time, which will weaken the penetration of sunlight and cause the surface temperature of the component to rise and affect the power generation efficiency of the component. When the surface of the component is dusty, the difference between the power generation before cleaning and the cleaning is 5.7%. If the cleaning is not carried out for a long time, the difference in the amount of dirt generated in the surface of the component can reach more than 10%.

The above analysis only affects the power generation of the components from the components themselves and external environmental factors. In addition to the factors mentioned above affecting the power generation efficiency and power generation, there are also components in the working process due to the electrical system and other factors. Power attenuation, power generation reduction, etc., follow-up process improvement, technology improvement, material development and more related research to solve and improve the factors affecting component power generation.