The warm days of spring have come, for PV users, the peak of power generation is also coming, today small benefit would like to talk with you about some general knowledge of the installation, operation and maintenance of PV systems.
1. photovoltaic modules on the shadow of the house, leaves and even bird droppings will have an impact on the power generation system?
A: The shaded photovoltaic cells will be consumed as a load, the energy generated by other unshaded cells, when the shaded cells will heat up, easy to form a hot spot effect. This reduces the power generation of the PV system, and even burns the PV module in serious cases.
2. In rainy or foggy weather, will the PV module still work? Will there be insufficient power or power failure?
A: The sun irradiance is low on rainy or hazy days, but the PV module still generates electricity under low light. As long as the working condition of the PV module reaches the start condition of the inverter, the PV power system will work normally. When the distributed grid-connected PV system is not working, the load is automatically powered by the grid, so there is no problem of power shortage and power failure.
3. winter when it is cold will not be insufficient power?
A: The factors that directly affect the power generation is the irradiation intensity, sunshine duration and the working temperature of the PV module, the irradiation intensity will be weaker in winter, the sunshine duration will be shorter, so the power generation will be reduced compared with the summer. But the distributed photovoltaic power generation system will be connected to the grid, as long as the grid has electricity, the household load will not have a power shortage and power outages.
4. Do I need to disconnect the PV system during a thunderstorm?
A: Distributed photovoltaic power generation systems are equipped with lightning protection devices, so no need to disconnect. For safety and insurance, it is recommended that you can choose to disconnect the circuit breaker switch of the sink box to cut off the circuit connection with the PV module, so as to avoid the lightning protection module cannot remove the harm caused by direct lightning. Operations and maintenance personnel should promptly test the performance of the lightning protection module to avoid the harm caused by the failure of the lightning protection module.
5. home installation system lightning protection only module bezel grounding lightning protection?
A: DC side of the module bezel grounded, in the case of a higher installation to join the DC surge protector, in addition, the AC side is also required to add AC surge protector.
6. how to clean photovoltaic modules?
A: Rainwater can be cleaned, no special maintenance is required. If you encounter adherent dirt, you can use a soft cloth with water to wipe it simply. It is recommended to use a soft brush and clean and mild water to clean the glass surface of the PV module, and to use less force when cleaning to avoid damaging the glass surface.
7. Is there any danger of electric shock when wiping with water?
A: There is no danger when wiping with water, the PV power system and the modules are protected by insulation and grounding. However, in order to avoid electric shock and possible damage to the modules when wiping them under high temperature and strong light, it is recommended to do the module cleaning in the morning or late afternoon.
8. Do I need to clean the PV modules after snow? How to clean?
A: When heavy snow accumulates on the module after snow, it needs to be cleaned manually. You can use soft objects to push the snow down, and be careful not to scratch the glass.
9. Can I step on top of the module to clean it?
A: The modules have a certain load capacity, but you cannot step on them to clean them, as it will cause hidden cracks and damage to the modules and affect their power generation and service life.
In general, strictly comply with the manual of each component of the system, and regular inspection and cleaning maintenance of the PV system, power generation will rise!
