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Distributed photovoltaic power generation - operation and maintenance chapter

Posted on 2021-11-23 16:52:53 By Maysun Solar
Photovoltaic has become the most potential, the most advantageous renewable energy, for the application of photovoltaic, large to ground photovoltaic power station, small to family rooftop photovoltaic power station, photovoltaic power generation has slowly come into the ordinary family, therefore, from a variety of perspectives to understand photovoltaic power generation is necessary, today brings the distributed photovoltaic power generation in the operation and maintenance chapter.

1、how long is the life of the household distributed photovoltaic power generation system?


The design life of PV power generation system without battery is generally 25 years.

2、 how to reduce the maintenance cost of photovoltaic system?


It is recommended to choose the system components and materials market reputation, good after-sales service products. Qualified products can reduce the rate of failure, users should strictly comply with the system product manual, regular testing and cleaning maintenance of the system.

3、photovoltaic system post-maintenance how to deal with, how often maintenance? How to maintain?

deal with photovoltaic system
According to the product supplier's instruction manual on the need for regular inspection of components for maintenance, the main maintenance work of the system is to wipe the photovoltaic modules, rainfall areas generally do not need to manually wipe, non-rainy season about once a month cleaning. Dustfall areas can increase the number of wipe as appropriate, snowfall areas should be heavy snow removal, to avoid affecting the power generation and snow melting uneven shading, clean up the trees or debris blocking photovoltaic modules, etc.

4、clean photovoltaic PV modules with water rinse and simple wipe on it? Will there be a risk of electric shock when wiping with water?


In order to avoid electric shock injury and possible damage to the PV module by wiping the PV module under high temperature and strong light, it is recommended to clean the PV module in the morning or late in the afternoon. It is recommended to clean the glass surface of photovoltaic PV modules with a soft brush, clean and mild water, the strength used in cleaning should be small to avoid damage to the glass surface.

5、Do I need to clean the PV power system after the snow? Photovoltaic photovoltaic modules in winter after the snow melts and freezes how to deal with? Can you step on the photovoltaic module above the clean-up work?

clean the PV power system after the snow
After the snow on the photovoltaic module if the accumulation of thick snow is necessary to clean, you can use soft objects to push the snow down, pay attention not to scratch the glass. Photovoltaic module is a certain load-bearing, but can not step on top of the photovoltaic module cleaning, will cause the PV module hidden crack, affecting the life of the PV module.

6、photovoltaic photovoltaic modules on the shadow of the house, leaves and even bird droppings will have an impact on the power generation system?


The electrical characteristics of solar cells used in each PV module are basically the same, otherwise the so-called hot spot effect will be produced on the cells with poor electrical performance or shaded (problematic cells). The shaded solar cell PV module in a tandem branch will be used as a load to consume the energy generated by other solar cell PV modules with light. The shaded solar cell PV module will then become hot, which is the hot spot phenomenon, and this phenomenon can seriously damage the solar cell. Some of the energy generated by the solar cell with light may be consumed by the shaded cell. In order to avoid the hot spot of the series branch, it is necessary to add bypass diodes on the PV PV module, and to prevent the hot spot of the parallel circuit, it is necessary to install DC insurance on each way of the PV string.


7、How to use the correct downtime for maintenance?


The priority is to choose early morning or late evening when the light is weak and the system is not running to maintain the system, and to take protective measures during maintenance, wear insulated gloves and use insulated tools.

8、What are the common failures of household distributed photovoltaic power generation system? What are the typical problems that may occur in each part of the system?


Common faults.


PV module partial burn

. The inverter cannot work or start because the voltage does not reach the start setting value

. Low power generation due to PV modules or inverters, etc.

Typical problems: burned junction box, PV module partial burn.

9、How to deal with the common failures of household distributed photovoltaic power generation system?


When the system has problems during the warranty period, you can contact the PV system installer or operation and maintenance provider by phone to explain the system problems, the installer or operation and maintenance provider will answer the questions according to the user's description, and send someone to the site for overhaul if the fault cannot be eliminated.

10、How to find out if a PV module in the PV array is malfunctioning?

switch of the sink box
When the user finds that the power generation capacity of the system is reduced at the same time, or compared with the neighboring power generation system with the same installation capacity. Then the system may have abnormalities. Users can monitor the abnormal fluctuation of data in the sink box, timely find out whether a string of photovoltaic modules in the photovoltaic array is malfunctioning, and then contact professionals to diagnose the system with professional equipment such as clamp meter and thermal imaging camera, and finally determine the photovoltaic components in the system that have problems.

11、in order to prevent the photovoltaic components by heavy impact, can you add wire protection net to the photovoltaic array?


It is not recommended to install wire protection net. It is not recommended to install wire protection net for PV arrays because it may cause shadow to PV modules and form hot spot effect, which will affect the power generation efficiency of the whole PV plant. In addition, due to qualified photovoltaic modules have been through the ice ball impact test, in general, do not need to install a protective net.


12、Does the vulnerable device need to be replaced immediately when it is broken?


Do not need to replace immediately, if you want to replace recommended in the morning or late afternoon. Should promptly contact the power station operation and maintenance personnel, by professionals to replace.


13、Do I need to disconnect the PV power generation system in thunderstorm?


Distributed photovoltaic power generation systems are equipped with lightning protection devices, so there is no need to disconnect. For safety insurance, it is recommended to choose to disconnect the circuit breaker switch of the sink box to cut off the circuit connection with the PV module to avoid the harm caused by direct lightning that cannot be removed by the lightning protection module. Operation and maintenance personnel should promptly test the performance of the lightning protection module to avoid the hazards arising from the failure of the lightning protection module.

14、Does the photovoltaic power generation system have electromagnetic radiation hazards to users?


Photovoltaic power generation system is based on the principle of photovoltaic effect to convert solar energy into electricity, no pollution, no radiation. Inverters, distribution cabinets and other electronic devices will pass EMC (electromagnetic compatibility) test, so there is no harm to human body.

15、Does the photovoltaic power generation system have noise hazards?


Photovoltaic power generation system converts solar energy into electricity without noise impact, and the noise index of the inverter is not higher than 65 decibels, so there is no noise hazard.

16、What should I pay attention to in terms of fire prevention and firefighting of the distributed photovoltaic power generation system?


It is forbidden to stack flammable and explosive items near the distributed power generation system, which will cause incalculable damage to people and property in case of fire. In addition to basic fire safety inspection measures, the PV system is specifically required to have self-detection and recognition of arc and fire functions to reduce the possibility of fire. It is also necessary to reserve fire prevention and maintenance access every 40 meters at the longest interval, and there must be an emergency DC system disconnect switch for easy operation.