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Frequently Asked Questions about PV power station

Frequently Asked Questions about PV power station
Jun 24, 2022

The following is a summary and answers to common questions about photovoltaic power plants. I hope more people will understand photovoltaics and take care of it in the right way, so as to ensure that the power plant can "increase electricity and earn money" for each family in a healthy and safe manner.


Frequently Asked Questions about PV power station


1.Q: In order to prevent heavy blows for photovoltaic components, can you install a wire protection net for photovoltaics?


A: It is not recommended to install the wire mesh protection net because it will affect the photovoltaic power generation, which may cause the entire iron net to cover and affect, thereby affecting the power generation capacity of the entire photovoltaic power station. In addition, since the power generation of photovoltaic modules passes the ice impact ball test, there is no need to install protective nets under normal circumstances.


2. Q:How to choose qualified system accessories and how long is the warranty period?


A: It is recommended to choose the system accessories products certified by the state-approved certification body, and the models, specifications and manufacturers of key components and raw materials should be consistent with the certified products. In addition, the specifications, models and technical parameters of all system accessories should match the design of the entire system. Generally speaking, modules require a warranty of at least 20 years, and inverters require a warranty of at least 5 years.


3. Q:Can the power generation of the system be monitored online?


A: Each power grid enterprise cooperates with the energy authorities at the same level to measure, monitor and count the distributed photovoltaic power generation within the coverage of the power grid at the same level. If the photovoltaic system is installed with a corresponding monitoring system, the power generation can be monitored online. In addition, the monitoring system can also realize online monitoring of key equipment parameters, power quality, and environmental parameters.


4. Q:If there is a power outage or other fault in the power grid, can the household distributed photovoltaic grid-connected system still operate normally?


A: After the power grid is cut off, the household distributed photovoltaic power generation system will generally be out of operation and cannot generate electricity normally. However, in some extreme cases, an islanding phenomenon may occur, that is, after a power outage occurs in the power grid, the household distributed photovoltaic power generation system will continue to operate under partial load, affecting the personal safety of maintenance personnel. personnel, and may damage household appliances and grid facilities. gender. Therefore, the distributed photovoltaic system must have anti-islanding function.


5.Q: How stable is the photovoltaic power generation system, and will it fail in a few years?


A: It is recommended to choose modules from big brands. They have passed the global authoritative monitoring certification, passed the salt spray and ammonia corrosion resistance test, and have excellent power generation performance in low light environment. The power generation performance of the module can still maintain more than 80% after 20 years of use.


6. Q: What are the requirements for the surrounding environment for the installation of rooftop photovoltaic power generation systems?


A: There are large dust pollution sources around the photovoltaic power generation system, strong wind and sand, and thick smoke will affect the use of light, resulting in a reduction in power generation.


7. Q: Are the benefits of installing on commercial roofs such as factories and individual household roofs the same?


A: The benefits are different. For distributed photovoltaic power generation, both the state and local governments currently provide fixed subsidies, so the income of photovoltaic kWh is directly affected by the level of household electricity prices. Yuan per kWh, the electricity price of institutions is 0.5-0.6 yuan per kWh, while government schools, hospitals, institutions, agricultural electricity and residential electricity are only 0.3-0.5 yuan per kWh. The benefits of distributed PV projects are different for buildings or for different buildings or electricity users, which requires developers to judge and decide whether the project is cost-effective or not.


8. Q: How to consider the color, light transmittance, size and shape of photovoltaic modules for projects combining distributed photovoltaics and buildings?


A: In terms of color, you can try to choose a color that is consistent with or similar to the color of the building. In terms of light transmission, it is necessary to consider the requirements of the building for light, not only to meet the needs of indoor light, to avoid secondary lighting, but also to make full use of the space and area of the building. Reasonable selection of size and shape, balance optimization, professional technical design.


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