Some common sense about the installation, operation and maintenance of solar systems(4).

Some common sense about the installation, operation and maintenance of solar systems.

7. Will there be a risk of electric shock when wiping with water?

Answer: Wiping with water will not be dangerous. The solar power generation system and components are insulated and grounded. However, in order to avoid electric shocks and possible damage to the components by wiping the components under high temperature and strong light, it is recommended to clean the components in the morning or late afternoon.

8. Do I need to clean up the snow on solar modules after snow? How to clean up?

Answer: When heavy snow accumulates on the components after snow, manual cleaning is required. You can use soft objects to push down the snow, being careful not to scratch the glass.

9. Can I step on the components to clean up?

Answer: The components have a certain load-bearing capacity, but you cannot step on the components to clean, which will cause the components to crack and damage, which will affect the power generation and service life of the components.

 

Some common sense about the installation, operation and maintenance of solar systems(3).

Some common sense about the installation, operation and maintenance of solar systems.

5. Does the lightning protection of the home improvement system only require the component frame to be grounded for lightning protection?

Answer: The frame of the DC end module is grounded. If the installation is high, add a DC surge protector. In addition, an AC surge protector needs to be installed on the AC side.

6. How to clean solar modules?

Answer: Rainwater can be cleaned without special maintenance. If you encounter adhesive dirt, you can simply wipe it with a soft cloth and clean water. It is recommended to use a soft brush and clean mild water when cleaning the glass surface of the solar module, and use a small amount of cleaning force to avoid damage to the glass surface. For modules with coated glass, pay attention to avoid damaging the coating layer.

Some common sense about the installation, operation and maintenance of solar systems(2).

Some common sense about the installation, operation and maintenance of solar systems.


3. Will there be insufficient power in winter when it is cold?

Answer: The factors that directly affect the power generation are the radiation intensity, the duration of the sunshine and the working temperature of the solar modules. The radiation intensity in winter will be weak and the duration of the sunshine will be shortened, so the power generation will be reduced compared with summer. But the distributed solar power generation system will be connected to the grid. As long as the grid has electricity, there will be no shortage of power and power outages in the household load.

4. Is it necessary to disconnect the solar power generation system during thunderstorms?

Answer: Distributed solar power generation systems are equipped with lightning protection devices, so there is no need to disconnect them. For safety and insurance, it is recommended that you choose to disconnect the circuit breaker switch of the combiner box and cut off the circuit connection with the solar module to prevent the lightning protection module from being unable to remove the harm caused by direct lightning strikes. The operation and maintenance personnel should check the performance of the lightning protection module in time to avoid the harm caused by the failure of the lightning protection module.


Some common sense about the installation, operation and maintenance of solar systems(1).

Some common sense about the installation, operation and maintenance of solar systems.

1. Will the shade of houses, leaves or even bird droppings on solar modules affect the power generation system?

Answer: The shaded solar cells will be consumed as a load, and the energy generated by other unshielded cells will generate heat at this time, which is likely to form a hot spot effect. Thereby reducing the power generation of the solar system, or even burn down the solar modules in severe cases.

2. Will the solar module still work in rainy or hazy weather? Will there be insufficient power or power failure?

Answer: The solar irradiance is low in rainy or hazy days, but the solar modules still generate electricity under low light. As long as the working state of the solar module reaches the starting conditions of the inverter, the solar power generation system will work normally. When the distributed grid-connected solar system is not working, the load is automatically supplied by the grid, and there is no power shortage and power outage problems.


How to install photovoltaics on complex roofs?




                                           On  Multi-angle, multi-directional roof

According to the basic principle of circuit series, in the same loop, the current is determined by the smallest component, which is the well-known principle of the barrel effect. Therefore, when designing the strings, the component model, installation angle, and number of strings of each loop of each inverter should be kept as consistent as possible. Each MPPT loop of the inverter runs independently and does not interfere with each other, so different MPPT loops can be different.

When facing a roof with a complex structure, you can select multiple inverters or multiple MPPT inverters based on the number of locally consistent components. At present, the inverter technology is very mature, and the harmonic suppression problem of multiple inverters in parallel has been solved. Inverters of different powers are combined together on the grid side without any problems. In projects with larger photovoltaic power, you can choose an inverter with high single-unit power and multiple MPPTs to further reduce the series-parallel mismatch loss of modules under complex roof conditions.

In some more complex scenarios, three-phase grid-connected and single-phase grid-connected may occur at the same time. At this time, three-phase inverters and single-phase inverters can also be combined. According to the current national standard "Design Specification for Low-Voltage Power Distribution", there are three forms of low-voltage power distribution systems, namely IT systems, TT systems, and TN systems. Among them, the IT system does not have a neutral line, and the TT system and TN system have a neutral line. In the industrial, commercial and civil systems, most of them are TN systems. The grid-connected inverter is connected to the grid, the three-phase inverter is three-phase five-wire, and the single-phase inverter is a live wire, a neutral wire and a ground wire. Therefore, when there are three-phase and single-phase, they are connected to the grid. In the scenario, there is no problem with the electrical connection.

★Note: When single-phase inverters are connected to the three-phase power grid, pay attention to the problem of three-phase unbalance. Therefore, try to connect the single-phase inverter to the phase with the largest load. If it is a single-phase inverter, Try to evenly distribute and connect to the three phases.