1. What are the main factors causing the efficiency and loss of photovoltaic power generation systems?
A: The efficiency of photovoltaic power generation system is affected by external influences, including shielding, gray layers, component attenuation, temperature influence, component matching, MPPT accuracy, inverter efficiency, transformer efficiency, DC and AC line loss, etc., as shown in the following figure. :
Each factor has different effects on efficiency. In the early stage of the project, attention should be paid to the optimal design of the system. The project operation process should take certain measures to reduce the impact of dust and other obstructions on the system.
2. How to reduce the maintenance cost of photovoltaic power generation system?
A: It is recommended to select good photovoltaic products with good reputation in the market and good after-sales service. Qualified products can reduce the incidence of failures. Users should strictly abide by the manuals of the system products and regularly test and clean the system.
3. How to handle the system's post-maintenance, how often will it be maintained and how to maintain it?
A: According to the product supplier's instructions for the need for regular inspection of the components to be maintained, the main maintenance of the system is to wipe the components, rain does not require large areas of artificial wipe, non-rainy season about once a month to clean once. Large areas where the amount of dust can be increased can increase the number of wipes as appropriate. Areas where snowfall is heavy should remove thick snow in a timely manner to avoid affecting the generation of electricity and the non-uniform shielding caused by the melting of snow, and to remove the trees or sundries of shielding components in time.
4. Does lightning storm need to disconnect photovoltaic power generation system?
A: The distributed photovoltaic power generation system is equipped with lightning protection devices, so there is no need to disconnect. For safety insurance, it is recommended to disconnect the circuit breaker switch of the combiner box, cut off the circuit connection with the PV module, and avoid the direct lightning strike damage that the lightning protection module cannot remove. The operation and maintenance personnel shall timely detect the performance of the lightning protection module to avoid the damage caused by the failure of the lightning protection module.
5. Do I need to clean up the photovoltaic power generation system after the snow? How will the PV modules be treated after the winter snow melts and melts? Can I step on the components to clean up?
A: If heavy snow accumulates on the components after the snow needs cleaning, you can use soft items to push the snow down, taking care not to scratch the glass. The components have a certain weight bearing, but can not be stepped on the components to clean, it will cause the components to be cracked or damaged, affecting the life of the components. It is generally recommended not to wait until the snow is too thick before cleaning to avoid excessive ice buildup.
6. Can photovoltaic power system resist the hazard of hail?
Answer: Qualified components in the PV grid-connected system must pass the maximum positive static load (wind load, snow load) 5400pa, the maximum back static load (wind load) 2400pa and the 25mm diameter hail impact at 23m/s and other rigorous tests . Therefore, hail does not cause harm to the photovoltaic power generation system.
7. Will the photovoltaic system still work if there is continuous rain or haze after installation? Will there be power shortage or power failure?
A: Photovoltaic modules can generate electricity under low light, but due to continuous rain or haze, the solar irradiance is low. If the operating voltage of the photovoltaic system does not reach the inverter's startup voltage, then the system It will not work.
The grid-connected distributed photovoltaic power generation system and the distribution network are operated in parallel. When the distributed photovoltaic power generation system cannot meet the load demand or it does not work due to cloudy days, the electricity of the grid will be automatically added. There is no power shortage and power failure. problem.
8. Will there be a shortage of electricity in cold weather in winter?
A: The photovoltaic system's power generation is indeed affected by temperature. The direct influence factors are the irradiation intensity and the sunshine duration as well as the operating temperature of the solar cell module. In winter, it is inevitable that the intensity of radiation will be weak, and the length of sunshine will be short. Generally, there will be less power generation than in summer, which is also a normal phenomenon. However, due to the fact that the distributed photovoltaic system is connected to the grid, as long as the grid has electricity, the household load will not suffer from power shortage and power failure.
9. Does photovoltaic power generation system have electromagnetic radiation harm to users?
A: Photovoltaic power generation systems convert solar energy into electricity based on the photovoltaic effect principle, without pollution or radiation. Inverters, power distribution cabinets and other electronic devices pass the EMC (Electromagnetic Compatibility) test, so there is no harm to the human body.
10. Is there any noise hazard in photovoltaic power generation system?
A: Photovoltaic power generation system converts solar energy into electricity without noise. The inverter noise index is not higher than 65 decibels and there is no noise hazard.
11. What are the photovoltaic system and product testing and quality certification agencies that are currently licensed in China?
A: The certification bodies mainly include: Beijing Jian Heng Certification Center, China Quality Certification Center, and China Building Materials Inspection and Certification Group.
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