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.

2. How to deal with common faults of distributed photovoltaic power generation systems?

In case of any problem in the system during the warranty period, the photovoltaic installer or operator can be contacted by telephone to explain the system problem. The photovoltaic installer or operator maintenance chamber will answer the problem according to the user’s description. If the fault cannot be eliminated, the special person will be sent to the site for maintenance.

3. How long is the service life of distributed photovoltaic power generation system?

The earliest photovoltaic power station in the United States was built in 1954. The earliest solar panel in China was used on satellites in 1971. The earliest photovoltaic power station was built in 1989, 26 years ago. The design life of a photovoltaic power generation system without a battery is generally 20-25 years.

4. How to reduce the maintenance cost of a photovoltaic power generation system?

It is recommended that the selected system components and materials are products with a good reputation and good after-sales service in the market. Qualified products can reduce the incidence of faults. Users should strictly abide by the operation manual of system products and regularly detect, clean and maintain the system.

5. How and how often is the system maintained? How to maintain?

The components requiring regular inspection shall be maintained according to the operating instructions of the product supplier. The main maintenance work of the system is to wipe the photovoltaic modules. In areas with heavy rain, manual wiping is generally not required. It shall be cleaned about once a month in non-rain seasons.

The cleaning times can be increased in areas with large dust fall, and the heavy snow shall be removed in time in areas with heavy snowfall, avoid affecting the power generation and the unevenness after snow melting, and timely clean up the sheltered trees or sundries.

6. When cleaning photovoltaic modules, can you just wash them with clean water and simply wipe them? Is there a risk of electric shock when wiping with water?

In order to avoid electric shock injury and possible damage to photovoltaic modules when wiping photovoltaic modules under high temperature and strong light, it is recommended to clean photovoltaic modules in the morning or late afternoon.

It is recommended to clean the glass surface of photovoltaic modules with soft brush, clean and mild water, and never use detergent, washing powder, etc,

In order to avoid damage to photovoltaic modules, the cleaning force should be small to avoid damaging the glass surface. For photovoltaic modules with coated glass, attention should be paid to avoid damaging the glass layer.

7. How to find out whether a photovoltaic module in the photovoltaic array is faulty?

When the user finds that the power generation of the system has decreased at the same time or compared with the same power generation system installed nearby, the system may be abnormal.

The user can timely find out whether a photovoltaic module in the photovoltaic array has fault through the abnormal fluctuation of the monitoring data in the combiner box, and then contact the professional to use the clamp table and some other professional equipment such as thermal imager to diagnose the system and finally determine the PV modules with problems in the system.

8. Will house shadows, leaves and even bird droppings on photovoltaic modules affect the power generation system?

The shading of house shadows, leaves and even bird droppings on photovoltaic modules will have a great impact on the power generation system. The electrical characteristics of solar cells used in each photovoltaic module are basically the same, otherwise, the so-called hot spot effect will be generated on solar cells with poor electrical performance or blocked, the blocked solar cell module in series will be used as a load to consume the energy generated by other illuminated solar cell modules.

The blocked solar cell module will heat at this time, which is the phenomenon of thermal effect. If this phenomenon is serious, the solar module will be damaged. In order to avoid the hot spots of the series branch, a bypass diode needs to be installed on the photovoltaic module, in order to prevent hot spots in the series circuit, DC fuse needs to be installed on each photovoltaic string. Even if there is no hot spot effect, the shielding of solar cells will affect the power generation.

9. Is it necessary to disconnect the photovoltaic power generation system in Thunderstorm and lightning protection weather? Can distributed photovoltaic power generation system resist the harm of hail?

Distributed photovoltaic power generation systems are equipped with lightning protection devices, so they do not need to be disconnected. For safety insurance, it is recommended to disconnect the circuit breaker switch of the combiner box and cut off the circuit connection with the photovoltaic module to avoid the harm caused by direct lightning that cannot be removed by the lightning protection module.

The operation and maintenance personnel shall timely detect the performance of the lightning protection module to avoid the harm caused by the failure of the lightning protection module.

Qualified photovoltaic modules in the photovoltaic grid-connected system must pass strict tests such as 5400pa maximum static load (wind load and snow load) on the front, 2400pa maximum static load on the back and impact of 25mm diameter hail at the speed of 23m / s, so it will not cause harm to the photovoltaic power generation system.

10. Who should the user report for repair after the grid-connected photovoltaic power generation system fails?

In case of photovoltaic system failure, the problem shall be fed back to the photovoltaic installer at the first time. The installer will deal with the failure in the shortest time. It is recommended to choose a photovoltaic installer with large brand and good reputation. At the same time, operation and maintenance centers can also be set up in various places, and in case of failure, the operation and maintenance center shall repair it.