During the long-term use of photovoltaic modules, they are affected by the external environment, and there are likely to be certain defects, resulting in power attenuation and reduced power generation. Wanjing New Energy, combined with practical application, summarizes the main factors affecting the power generation of PV modules, and hopes to help you interested in new energy PV power plants.
Quality of photovoltaic modules
At present, the photovoltaic modules are divided into single crystal silicon and polycrystalline silicon. After verification of the industry and actual benefits, the photovoltaic modules of monocrystalline silicon perform better in resisting cracking. High-quality photovoltaic modules have almost no defects such as cracks, black hearts, oxidation, cold soldering, and back sheets, and the aging conditions after long-term use are good, and the power will not be affected due to the long-term operation of the components, nor will it cause photovoltaics. The power generation of the power station components is low.
In the previous article of Wanjing New Energy, the identification method of PV modules was introduced. You can jump to “Teach you to identify the advantages and disadvantages of PV power plant materialsâ€.
PID effect
In the long-term work of photovoltaic modules, as water vapor permeates into the interior of the module through the backing plate, EVA is hydrolyzed, and acetic acid ions cause metal ions to precipitate in the glass, resulting in high bias voltage between the internal circuit and the frame of the module. The power generation has dropped dramatically.
How to install PV modules
In the same geographical location, due to the difference in the installation inclination of the PV power plant 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. For example, many users feel that the system does not generate electricity except for Zhengnan. In fact, at lower latitudes, even if the square is facing north, the best power generation loss for the whole year will not be less than 25%. To the east, west is about 93% of the best power generation direction. The design concept of the home photovoltaic system and the large ground power station is different. The roof of the family is the most precious resource. As much as possible, the comprehensive income can be maximized, but attention should be paid to the matching of the strings.
Regarding the installation method of photovoltaic modules, you can also click on "What are the ways to install the brackets of the new energy photovoltaic power station?"
Weather factor
The weather is also one of the factors affecting the power generation efficiency of photovoltaic power plant components. In the rainy weather and thicker clouds, the intensity of sunlight is reduced, the solar panels absorb less sunlight, 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 photovoltaic module is constant, the amount of power generated by the photovoltaic system is determined by the radiation intensity of the sun.
Shadow occlusion
During the working process, the photovoltaic power plant components are partially blocked by shadows and the degree of dust settlement is different. The pollution of bird droppings will cause “hot spot effectâ€. The occluded components will not provide power contribution and become energy-consuming loads inside the components. At the same time, the local temperature of the component is increased, and the overheated region may cause the EVA to accelerate aging and yellowing, so that the transmittance of the region is lowered, thereby further deteriorating the hot spot, resulting in an increase in failure of the solar cell module.
Temperature Coefficient
The temperature coefficient of the crystalline silicon battery is generally -0.4% to -0.45% / ° C, and the single crystal temperature coefficient is smaller than polycrystalline. Changes in the ambient temperature and the heat generated by the PV plant components during operation cause the component temperature to rise, which also causes the power generation of the components to decrease.
Cleaning and maintenance
Photovoltaic power plant components are exposed to outdoor conditions for a long time, and 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. 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%.
Regarding the cleaning and maintenance of photovoltaic power stations, Wanjing New Energy has summarized the “maintenance of new energy photovoltaic power stationsâ€, which you can learn in detail.
In addition to the above factors can affect the power generation efficiency and power generation of photovoltaic power plants, the electrical system end and other factors will also cause the power attenuation and power generation of the components in the working process. Subsequent Wanjing New Energy will answer the factors affecting the power generation of PV power plant components through more aspects such as process, technology and materials.
Silicon TVS / TSS:
Diode TVS (Transient Voltage Suppressor), also known as Transient suppression diodes, is widely used a new type of high efficient circuit protection device, it has a fast response time (the nanosecond) and high surge absorbing ability.When it ends of stand moments of high energy shock, TVS can bring the two ends at high rate from high impedance to a low impedance between impedance values, to absorb a large current moment, put it at both ends of the voltage restraint on a predetermined value, thus protecting the back of the circuit components are not affected by the impact of the transient high pressure spikes.
Silicon TVS Transient Voltage Suppresso,Silicon TSS Transient Voltage Suppresso
YANGZHOU POSITIONING TECH CO., LTD. , https://www.yzpst.com