Nowadays, solar street lamps are more and more widely used and vigorously promoted by the country. However, subject to the development of science and technology, the technology of solar street lamps is not mature enough.

As an important part of the solar street lamp system, the solar panel is mainly used to absorb solar energy, convert light energy into electric energy, and power the whole system.

Technical characteristics of solar panels

It is designed according to the requirements of IEC: 1215:1993 standard of International Electrotechnical Commission, and the processing and production process is produced in strict accordance with the standard, which can ensure the quality, electrical performance and service life requirements of solar panels.

A solar panel is one of the most important pieces of equipment of a photovoltaic power station, and the cost accounts for about half of the grid-connected system. The technical parameters of solar panels are very important to the system design.

Among them, the parameters such as maximum output power, open-circuit voltage, short-circuit current, filling factor and conversion efficiency are the symbols to measure the performance of the solar panels.

1. If the solar panel breaks down and does not generate electricity, the controller cannot sense current, it will be considered as dark, so the light will be on during the day.

2. The positive and negative poles of the solar panel are connected reversely, and the power generated cannot be charged into the controller. The controller will also think it is dark, so the light will not be on.

3. The junction box of the solar panel is not well welded, which may lead to faulty welding, resulting in no power transmission, and the light will be on during the day.

As a supporting product of photovoltaic modules, the cost of the junction boxes is less than one-tenth of the cost of solar panels, but it is an important component to determine whether the photovoltaic modules can work normally in the end.

Because it can not only transmit the electricity generated by solar panels to external circuits but also be the “bodyguard” of photovoltaic modules. If the junction box is improperly selected, the solar panel can be burned, which will affect the performance of the whole photovoltaic system.

In recent years, it is understood that the intelligent photovoltaic junction box can improve the power generation efficiency of the system by 47.5%. What are the three functions of the intelligent photovoltaic junction box? In addition to MPPT function and intelligent shutdown function under abnormal conditions such as fire, what other functions does it have? Now come with us to understand.

1. The following preparations shall be made before the installation of photovoltaic support and module

1) Set up unloading platform and personnel walkway at the corresponding position of each plant, and lay bulk material channel on the roof to avoid damage to the roof. Clean the roof drainage system to avoid poor water flow in the rainy season and necessary loss.

2) The roof shall be verified before construction. If it is inconsistent with the design, it shall be adjusted accordingly according to the design and design disclosure. Measure and set out according to the baseline position marked in the design drawing, and control the right angle direction of each square array.

Most of the electrical appliances in our RV need to be powered by the 12V power supply system in the vehicle. The RV battery is to the RV like food to mankind. Without a sufficient power supply, the household appliances in the RV are impossible to talk about.

Since we all know the importance of batteries to RV, but many friends who have just bought RV do not know enough about RV batteries, there will be problems in the process of use, resulting in the reduction of battery life.

In China, photovoltaic power stations have been constructed in batches since 2010. At this time, there are few domestic series inverter suppliers and the technology is immature, while the price of foreign products is very high.

The system cost of using a series inverter in large ground power stations is much higher than that of using the centralized inverter, which makes a centralized inverter the first choice for ground power stations, As a result, the centralized inverter occupies an absolutely dominant position in China’s ground power plants. The majority of photovoltaic practitioners are not familiar with a series inverter, and there are still misunderstandings in understanding, mainly including the following points:

1. Is the power generation monitoring data of the photovoltaic grid-connected system the same as the metering data of the grid two-way electricity meter? How big is the error?

The power generation monitoring data of distributed photovoltaic grid-connected system and the metering data of electricity meter are not necessarily the same. If the same electricity metering equipment is used at the same parallel node and the accuracy is exactly the same, the data obtained should be the same.