What is the installed capacity of rooftop photovoltaic systems?

A: Installing a photovoltaic system on the roof is closely related to the installed capacity and roof area.

Based on the size of the installed roof, a typical household roof can accommodate projects ranging from 3kW to 10kW. If the roof area is larger, higher power photovoltaic modules can also be installed.

Can a photovoltaic system still be installed on a roof that does not face south?

A: When the sunlight is directly facing the solar panel, the solar panel receives the maximum amount of solar energy absorption per unit area, which is best when facing north in the southern hemisphere and south in the northern hemisphere;

China is located in the northern hemisphere. If the house does not face south, it is still possible to install a photovoltaic power generation system, but the power generation will be reduced.

The power generation varies according to the direction of the roof, with approximately 98% for south facing houses and 50-75% for north facing houses.

How often is it better to clean photovoltaic panels?

A: The cleaning cycle of photovoltaic panels needs to be determined based on the actual degree of contamination and rainfall conditions. If the local rainfall is frequent and there is only a small amount of dust and no obvious foreign objects on the panels, there is no need for special cleaning.

If there is less rainfall and more dust on the photovoltaic panels locally, it is best to clean them once a month to avoid dust and debris affecting the power generation efficiency of the photovoltaic modules.

Can solar panels of different specifications be connected in series or parallel?

A: It is not recommended to connect solar panels of different specifications in series, as the current of the entire circuit will be close to that of the solar panel with the smallest current;

After parallel connection of solar panels of different specifications, the voltage of the entire circuit will tend towards the solar panel with the lowest voltage. This is a loss for high-power solar panels in the circuit.

How to choose the azimuth and tilt angle of photovoltaic modules?

A: In general, the azimuth angle of photovoltaic modules is selected within ± 20 ° in the due south direction to ensure the maximum power generation per unit capacity of the photovoltaic system. If conditions permit, try to be as southwest as possible by 20 °.

The tilt angle of photovoltaic modules varies in different regions, and professional photovoltaic companies are more familiar with the optimal tilt angle of photovoltaic modules in the local area.

If the roof itself is sloping, the photovoltaic modules can be laid flat without considering the tilt angle of the modules, making it more aesthetically pleasing.

What are the causes and treatment measures for severe distortion and deformation of flexible photovoltaic panels after use?

A: Reason analysis: During use, the back of the solar panel is often suspended or uneven.

Solution: Place the solar panel on an outdoor flat surface and expose it to the sun. Use a flat thin wooden board or other object to press it onto the upper surface, and repair the distortion and deformation problem appropriately in the evening.

What factors should be considered to ensure the power generation efficiency of photovoltaic systems?

A: Firstly, the efficiency and quality of photovoltaic modules;

Secondly, the installation position and inclination angle of photovoltaic modules;

Thirdly, the situation of solar radiation;

Fourthly, whether the photovoltaic modules are matched and the matching loss amount.

What are the advantages of household grid connected solar energy systems?

A: Firstly, the energy source of the household grid connected system comes from solar energy, which is free and environmentally friendly. At the same time, the grid connected operation of the system can ensure the stability and quality of load power supply;

Secondly, save electricity costs and increase additional income. When there is surplus electricity generated by photovoltaic systems for household loads, it can be fed into the grid to meet the electricity needs of its own households while also generating sales revenue;

Thirdly, it has the characteristics of nearby power generation, nearby grid connection, and nearby use, effectively solving the problem of power loss in boosting and long-distance transportation. It has the advantages of short installation period, low investment, and simple grid connection.

How to calculate the power generation efficiency of solar panels?

A: The power generation efficiency of solar panels is equal to the power of the solar cells divided by the maximum output power during use. The power generation efficiency of solar panels is not fixed, and in addition to the quality factors of the solar cells themselves, it is also affected by other external factors.

How to calculate the photoelectric conversion efficiency of solar panels?

A: The photoelectric conversion efficiency of solar panels (solar cells)=solar cell power/solar cell area. In general, for solar panels of the same power, the higher the photoelectric conversion efficiency, the smaller the size of the solar panel will be.

Does dust on the surface of a photovoltaic system affect its power generation?

A: There is an impact. If the volume of dust or foreign objects on the surface of the system is too large, it will cause obstruction and shadows.

On the one hand, it will affect the power generation efficiency of the system, and on the other hand, it may cause adverse phenomena such as hot spots and hidden cracks.