Q & A of solar PV power generation system

　　Q: Will there be insufficient power in winter when it is cold?

　　A: The factors that directly affect the power generation are the intensity of radiation, the duration of sunshine, and the ambient temperature. In winter, the ambient temperature decreases, the intensity of solar radiation becomes weaker, and the sunshine time becomes shorter, so the power generation will be less than in summer.

　　Q: Does PV power generation have radiation and pollution?

　　A: PV power generation is free of radiation and pollution. However, PV panels and energy storage batteries contain certain pollution sources, which will cause certain environmental pollution when they are scrapped and recycled, and qualified recyclers must be selected.

　　Q: Application scope and installation method of distributed PV power generation system?

　　A: It can be installed in any place exposed to sunlight, including the ground, the top of the building, the side elevation, and the balcony. There are three types of installation methods: concrete, color steel plate and tile type.

　　Q: How to consider the impact of load on PV arrays and buildings?

　　A: From the perspective of safety and stability, it is necessary to consider the impact of permanent load, wind load, snow load, and temperature load on PV arrays and buildings. When designing, it is necessary to ensure that the PV modules, brackets and square array foundation have sufficient strength and rigidity to withstand the local extreme weather. Before installation, the load capacity of the building should be surveyed, calculated and checked.

　　Q: After installation, if continuous rain or haze, will the PV power generation system still work?

　　A: In the case of continuous rain or haze, if the working voltage of the PV system does not reach the starting voltage of the inverter, the system will not work.

　　Q: Will distributed PV power generation affect the power supply quality of the grid?

　　A: The main indicators to measure the quality of power supply are voltage, frequency and waveform. The electricity generated by the PV power generation system needs to pass the grid inspection before it can be integrated into the grid

　　Q: Is the power generation monitoring of the distributed PV grid-connected system the same as the metering data? How big is the error?

　　A: The measurement data of the two are not necessarily the same. The monitoring equipment used in the PV grid-connected system is often the equipment used by itself, and the metering equipment is often the equipment installed by the power department. Therefore, the source of the equipment is different, and the data obtained may have some gaps. The settlement of electricity bills and subsidies is based on the metering equipment installed by the power sector.

　　Q: What are the benefits of installing PV power generation systems for industrial and commercial users?

　　A: The benefits are: large electricity consumption in industry and commerce, high electricity prices, a large proportion of spontaneous self-use, short payback period, and high profitability, which can help industrial users complete energy-saving and emission-reduction targets.

　　Q: How to estimate the power generation of the distributed PV grid-connected system?

　　A: We need to know the effective sunshine time, system efficiency, and system installation capacity of the installation site. For example, for a 1000 watt PV grid-connected system, the installation location is Tokyo, the effective sunshine time is 4 hours, and the system efficiency is 80%. The calculation formula for the daily power generation of the system = module installation capacity × effective sunshine hours × system efficiency = 1000 × 4 ×0.8=3200wh, which is about 3.2 kWh of electricity.

　　Q: Does the PV power generation system have noise hazards?

　　A: PV power generation system converts solar energy into electrical energy without noise. The noise index of the inverter is not higher than 65 decibels, and there will be no noise influence.

　　Q: Will the shade of houses, leaves or even bird droppings on PV modules affect the power generation system?

　　A: This has a relatively large impact on the power generation system, which will cause the so-called hot spot phenomenon. The hot spot phenomenon is a shaded solar cell module, which will be used as a load to consume the energy generated by other solar cell modules with light. It will heat up severely and even fail.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, PV energy storage, UPS, data center and other industries.

　　Solar power generation system with lithium battery energy storage system is a very promising clean energy.