In winter, there is heavy snow and wind in many areas. For photovoltaic power plants, the operation and maintenance of power plants after snow is particularly important. What problems should we pay attention to in the maintenance of photovoltaic power plants in winter?
Question 1: what are the main factors that cause the efficiency decline and loss of photovoltaic power generation system?
Answer: the efficiency of photovoltaic power generation system is affected by external factors, including shielding, ash layer, component attenuation, temperature influence, component matching, MPPT accuracy, inverter efficiency, transformer efficiency, DC and AC line loss, etc. each factor has different influence on efficiency. Pay attention to the optimal design of the system in the early stage of the project, and take certain measures to reduce the operation process of the project The influence of dust on the system.
Question 2: how to reduce the maintenance cost of photovoltaic power generation system?
A: it is recommended to select photovoltaic products with good reputation and after-sales service. Qualified products can reduce the failure rate. Users should strictly abide by the user manual of the system products, and regularly test and clean the system.
Question 3: how to deal with the later maintenance of the system, how often and how to maintain it?
Answer: according to the product supplier's operation manual, maintain the components that need to be checked regularly. The main maintenance work of the system is to wipe the components. In areas with heavy rain, it is generally not necessary to wipe manually. In non rain seasons, it is about once a month. In areas with large amount of dust, the number of wiping can be increased as appropriate. In areas with large amount of snow, the heavy snow shall be removed in time to avoid uneven shielding caused by power generation and snow melting, and the trees or sundries blocking the components shall be cleaned in time.
Question 4: does the photovoltaic power generation system need to be disconnected in thunderstorm weather?
A: all distributed photovoltaic power generation systems are equipped with lightning protection devices, so they need not be disconnected. In order to ensure safety, it is recommended to disconnect the breaker switch of combiner box and cut off the circuit connection with photovoltaic module, so as to avoid hazards caused by direct lightning which cannot be removed by lightning protection module. 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.
Question 5: do you need to clean up photovoltaic power generation system after snow? How to deal with photovoltaic modules after snow melting and icing in winter?
A: if there is heavy snow on the components after snow, it needs to be cleaned. You can use soft objects to push the snow down. Be careful not to scratch the glass. Components have certain load-bearing, but they cannot be cleaned by stepping on them, which will cause hidden crack or damage of components and affect the service life of components. Generally, it is not recommended to wash it after the snow is too thick to avoid excessive icing of components.
Question 6: can photovoltaic power generation system resist hail?
Answer: the qualified components in the photovoltaic grid connected system must pass the strict test of 5400pa maximum static load (wind load, snow load), 2400pa maximum static load (wind load) on the back and impact with 23m / s speed by hailstone with diameter of 25mm. Therefore, hail will not bring harm to photovoltaic power generation system.
Question 7: if there is continuous rain or haze after installation, will the photovoltaic power generation system still work?
A: photovoltaic modules can also generate electricity under certain weak light, but due to continuous rainy or haze weather, the solar irradiance is low, if the working voltage of photovoltaic system cannot reach the starting voltage of inverter, then the system will not work.
The grid connected distributed photovoltaic power generation system and the distribution network operate in parallel. When the distributed photovoltaic power generation system cannot meet the load demand or does not work due to overcast days, the power of the grid will be automatically replenished, and there is no shortage of power and power failure.
Question 8: will there be a shortage of electricity when it's cold in winter?
A: the power generation of photovoltaic system is indeed affected by the temperature. The direct factors are the irradiation intensity and sunshine duration as well as the operating temperature of solar cell module. It is inevitable that the radiation intensity will be weak in winter and the sunshine duration will be short. Generally, the power generation will be less than that in summer, which is also a very normal phenomenon. However, as the distributed photovoltaic system is connected with the power grid, as long as the power grid has power, the household load will not have power shortage and power failure.
Question 9: does photovoltaic power generation system have electromagnetic radiation and noise hazards to users?
A: photovoltaic power generation system converts solar energy into electric energy according to the principle of photovoltaic effect, without pollution and radiation. Inverter, distribution cabinet and other electronic devices will pass the EMC (electromagnetic compatibility) test, so there is no harm to human body. Photovoltaic power generation system is to convert solar energy into electric energy, without noise impact. The noise index of inverter is not higher than 65dB, and there is no noise hazard.