Distributed Photovoltaic Power Generation - Operation and Maintenance Chapter

· Industry News

Photovoltaic has become the most promising and 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 perspectivesto understand photovoltaic power generation is necessary, today brings the distributed photovoltaic power generation in the operation and maintenance chapter.   

Maysun soalr

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

PV power generation systems without batteries are generally designed for a life of 25years.   

2. How to reduce the maintenance cost of photoelectric system? 

It is recommended to choose the system components and materials market reputation,good after-sales service products. Qualified products can reduce the occurrence of failure rate, the user 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?       

Timely cleaning of photovoltaic modules

According to the product supplier's instruction manual for the components that need to be checked regularly for maintenance, the main maintenance work of the system is to wipe the PV modules, rainfall areas generally do not need manual wiping, non-rainy season about 1 month to clean once. Areas with high dustfall can increase the number of wiping as appropriate. Areas with high snowfall should remove heavy snow to avoid affecting power generation and uneven shading after snow melting,clean up trees or debris that block PV modules, etc.   

4. When cleaning photovoltaic modules with water rinse and simple wipe on it? Is there any risk of electric shock when wiping with water?   

To avoid electric shock and possible damage to the PV modules by wiping them under high temperatures and strong light, it is recommended that PV module cleaning becarried out in the morning or late afternoon. It is recommended to use a soft brush, clean and mild water when cleaning the glass surface of the PV module,and to use less force when cleaning to avoid damaging the glass surface.   

5. after the snow need to clean photovoltaic power generation system? Photovoltaic modules in the winter after the snow melts and freezes how to deal with? Can step on top of the photovoltaic modules to clean up work?   

Cleaning photovoltaic systems after 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 components are certain load-bearing, but cannot step on the photovoltaic components above the cleaning, will cause the photovoltaic components hidden crack, affect the life of photovoltaic components. 

6. 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 the solar cells used in each PV module are basically the same, otherwise there will be a so-called hot spot effect on cells with poor electrical performance or shaded cells (problem cells). The shaded solar cell PV module in a tandem branch will be used as a load to consume the energy produced by the other solar cell PV modules with light, the shaded solar cell PV module will then become hot, this is the hot spot phenomenon, this phenomenon can seriously damage the solar cell. Some of the energy produced by the solar cell with light may be consumed by the shaded cell. In order to avoid hot spots in the series branch circuit, a bypass diode needs to be added to the PV module, and in order to prevent hot spots in the parallel circuit, a DC fuse needs to be installed on each PV string.   

7. How to make proper use of down time for maintenance? 

Give priority to early morning or late evening when the light is low and the system is no trunning for maintenance, and take protective measures when maintaining the system, wear insulated gloves and use insulated tools.   

8. What are the common failures of household distributed photovoltaic power generation systems?What are the typical problems that may occur with each component of the system? 

Common faults. 

. The voltage does not reach the start-up set point causing the inverter to fail to work and start up, . 

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

Typical problems: junction box burned, PV module partially burned.   

Burnt junction boxes, partially burnt PV modules

9. how to deal with common failures of household distributed photovoltaic power generation system? 

When the system has problems during the warranty period, you can first 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 according to the user's narrative, such as the failure can not be eliminated will be sent to the scene for maintenance.   

10. How can I find out if a PV module in the PV array has failed? 

When the user finds that the power generation of the system is reduced at the same time of year, or compared to neighboring power generation systems with the same amountof installations. Then the system may have an abnormality. Users can monitorthe abnormal fluctuation of data in the sink box, timely find out whether astring of PV modules in the PV array is faulty, and then contact professionals to diagnose the system with professional equipment such as clamp meter and thermal imaging camera, and finally determine the PV modules with problems in the system.   

How to find out if a PV module in a PV array is faulty

11. To prevent the photo electric module from being hit by heavy objects, can I add wire protection net to the PV array? 

It is not recommended to install wire mesh. It is not recommended to install wire mesh because it may cause shadow to the PV module, forming hot spot effect and affecting the power generation efficiency of the whole PV plant. In addition,since qualified PV modules have passed the ice ball impact test, it is generally not necessary to install wire mesh.   

12. Do I need to replace the wearable parts immediately when they are broken? 

Do not need to replace immediately, if you want to replace recommended in the morning or late afternoon. You should contact the power station operation and maintenance personnel in time, the professional staff to replace.   

13. Do I need to disconnect my PV system during alightning storm? 

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 which cannot be removed by the lightning protection module.Operation and maintenance personnel should test the performance of the lightning protection module in time 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. Inverter,distribution cabinet 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 is the conversion of solar energy into electricity will not produce noise impact, 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 household distributed photovoltaic power generation system? 

Distributed power generation system near the pile of flammable and explosive substances is prohibited, once the fire caused by the loss of people and property is incalculable. In addition to the basic fire safety measures, the PV system is specifically required to have self-detection, arc and fire recognition functions to reduce the possibility of fire. In addition, fire protection and maintenance access must be reserved at intervals of up to 40 metres, and there must be easily accessible emergency DC system disconnect switches. 

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