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.

Why is it difficult to shake the mainstream position of 166 photovoltaic modules in the distributed market?

Since its listing, 166 photovoltaic modules have rapidly occupied the distributed market with their advantages of flexibility, lightness, high efficiency and steady income. At present, it has become the mainstream of photovoltaic module selection in the distributed field.

1. What are the common faults of distributed photovoltaic power generation systems? What typical problems may occur in each component of the system?

The inverter cannot work and start-up because the voltage does not reach the start-up set value, and the power generation is low due to photovoltaic modules or inverters. Typical problems that may occur in system components include the burning of the junction boxes and the local burning of photovoltaic modules.

BIPV, namely photovoltaic building integration.

BIPV is a technology that integrates solar photovoltaic power generation products into buildings and uses idle building roofs (including industrial plants, shopping malls, public buildings, etc.) and ancillary sites to build distributed photovoltaic power generation projects.

While producing clean electric energy, it also plays a role in thermal insulation and reducing energy consumption for buildings, which has good economic and social benefits.