Q1 What are the main factors that lead to the decline and loss of photovoltaic power generation system efficiency?
Answer: The efficiency of photovoltaic power generation system is lost due to external influences, including shading, gray layer, component attenuation, temperature influence, component matching, MPPT accuracy, inverter efficiency, transformer efficiency, DC and AC line losses, etc. The impact of efficiency is also different. In the early stage of the project, attention should be paid to the optimal design of the system, and certain measures should be taken during the project operation process to reduce the impact of dust and other obstructions on the system.
Q2How to reduce the maintenance cost of photovoltaic power generation system?
A: It is recommended to choose photovoltaic products with good reputation and good after-sales service on the market. Qualified products can reduce the incidence of failures. Users should strictly abide by the user manual of the system products, and regularly test and clean the system.
Q3 How to deal with the post-maintenance of the system, and how often to maintain it? How to maintain it?
A: According to the product supplier's instruction manual, maintain the parts that need to be inspected regularly. The main maintenance work of the system is to wipe the components. In areas with heavy rain, manual wiping is generally not required. In non-rainy seasons, cleaning is about once a month. In areas with a large amount of dust, the frequency of wiping can be increased as appropriate. In areas with a large amount of snow, the heavy snow should be removed in time to avoid affecting the power generation and uneven shading caused by the melting of the snow, and timely clean up the trees or sundries that block the components.
Q4 Is it necessary to disconnect the photovoltaic power generation system in thunderstorm weather?
A: Distributed photovoltaic power generation systems are equipped with lightning protection devices, so there is no need to disconnect them. For safety and insurance, it is recommended to disconnect the circuit breaker switch of the combiner box and cut off the circuit connection with the photovoltaic modules, so as to avoid direct lightning strikes that cannot be removed by the lightning protection module. The operation and maintenance personnel should detect the performance of the lightning protection module in time to avoid the harm caused by the failure of the lightning protection module.
Q5 Do I need to clean up the photovoltaic power generation system after snow? How to deal with the photovoltaic modules after the snow melts and freezes in winter?
A: If there is heavy snow on the module after snow, it needs to be cleaned. You can use soft objects to push the snow down, and be careful not to scratch the glass. The components have a certain load-bearing capacity, but you cannot step on the components for cleaning, which will cause cracks or damage to the components and affect the life of the components. It is generally recommended not to wait until the snow is too thick before cleaning to avoid excessive freezing of components.
Q6 Can the photovoltaic power generation system resist the hazard of hail?
Answer: Qualified components in the photovoltaic grid-connected system must pass strict tests such as the maximum static load (wind load, snow load) of 5400pa on the front, the maximum static load (wind load) of 2400pa on the back, and the impact of hail with a diameter of 25mm at a speed of 23m/s, etc. . Therefore, hail will not harm the photovoltaic power generation system.
Q7 If there is continuous rain or haze after installation, will the photovoltaic power generation system still work?
Answer: Photovoltaic cell modules can also generate electricity under certain weak light, but due to continuous rain or haze weather, the solar irradiance is low, and if the working voltage of the photovoltaic system cannot reach the starting voltage of the inverter, then the system just won't work.
The grid-connected distributed photovoltaic power generation system operates in parallel with the distribution network. When the distributed photovoltaic power generation system cannot meet the load demand or does not work due to cloudy days, the power of the grid will be automatically supplemented, and there will be no power shortage and power failure. question.
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Do you know how much electricity is generated by the rooftop power station in the rainy season?
Q8 Will the power be insufficient when it is cold in winter?
A: The power generation of the photovoltaic system is indeed affected by temperature. The direct influencing factors are the radiation intensity and sunshine duration, as well as the working temperature of the solar cell module. In winter, the radiation intensity will inevitably be weak, the sunshine duration will be short, and the general power generation will be less than that in summer, which is also a normal phenomenon. However, since the distributed photovoltaic system is connected to the grid, as long as the grid has electricity, there will be no shortage of power and power outages for household loads.
Q9 Does the photovoltaic power generation system have electromagnetic radiation and noise hazards to users?
Answer: The photovoltaic power generation system converts solar energy into electric energy according to the principle of photovoltaic effect, without pollution and radiation. Electronic devices such as inverters and power distribution cabinets will pass the EMC (Electromagnetic Compatibility) test, so there is no harm to the human body. Photovoltaic power generation system converts solar energy into electrical energy without noise impact. The noise index of the inverter is not higher than 65 decibels, and there is no noise hazard.