1. What is distributed photovoltaic power generation?
Distributed photovoltaic power generation is a system of photovoltaic modules built near the user’s location, where some of the energy generated is used by the user and some is fed into the grid.
Distributed photovoltaic power generation adapts to local conditions, is clean and efficient. It aims to reduce and replace fossil energy consumption by using solar energy.
2. What are the advantages of photovoltaic power generation?
- You can earn income by selling the excess electricity you generate with your solar panels to the grid, and you can also save money by purchasing electricity from the grid when the electricity you generate is insufficient. In addition, the energy you produce with your solar panels is clean and does not harm the nature.
- Insulation and cooling: Panels on your roof can cool your home by 3-6 degrees in the summer and reduce heat transfer in the winter.
- Green and environmentally friendly: Distributed photovoltaic power generation projects do not generate light pollution in the power generation process, and the emission and pollution are zero.
- A perfect combination of architecture, aesthetics and photovoltaic technology gives the roof a beautiful and impressive appearance, a strong sense of technology and increases property value.
3. If the roof does not face south, can a photovoltaic energy production system be installed?
It can be installed, but the energy production will be slightly lower and there will be a difference in energy production depending on the orientation of the roof. When facing south, the production efficiency is 100%, 70-95% when facing east-west and 50-70% when facing north.
7. Does rainy or cloudy weather affect power generation?
It would be wrong to say that it will not have an impact, but it will not have a major impact.
8. Is reduced yield a problem on rainy and cloudy days?
This is not a concern because a photovoltaic system is a grid-connected power generation system. When photovoltaic power generation cannot meet the owner’s electricity needs at any time, the system automatically receives electricity from the grid.
9. Will dust or debris on the surface of the system affect power generation?
The glass of the solar modules has a self-cleaning function that allows rainwater to wash dirt off the surface of the solar modules on rainy days.
However, factors with large shading areas, such as bird droppings and leaves, need to be removed in a timely manner.
10. Do photovoltaic systems cause light pollution?
No, In principle, the photovoltaic system uses tempered glass coated with antireflex film to maximize light absorption and reduce reflection, thus improving power generation efficiency.
No light reflection or light pollution. Traditional curtain wall glass or car glass reflects 15% or more, while the reflection rate of photovoltaic glass from premium solar module manufacturers is less than 6%.
Therefore, it has lower light reflection than glass in other industries, so there is no light pollution.
11. How to ensure efficient and reliable operation of photovoltaic systems for 25 years?
First of all, strict quality control is applied in product selection, and photovoltaic module manufacturers guarantee that the power generation of the photovoltaic module will not encounter any problems for 25 years:
- Photovoltaic module power generation under 25-year warranty to ensure module efficiency
- Having a national level laboratory (with strict quality control system in the production line)
- Large scale (the larger the production capacity, the larger the market share and the more pronounced the economies of scale)
- Strong reputation (the stronger the brand impact, the better the after-sales service)
- Focusing only on solar photovoltaic energy (photovoltaic companies and companies that only deal with photovoltaics in their subsidiaries have different attitudes to industry sustainability).
In terms of system configuration, it is important to select the most suitable inverter, combination box, lightning protection module, distribution box, cable, etc. compatible with the photovoltaic components.
Secondly, it is important to choose the most appropriate fixing method for the system structure design and fixing to the roof and try not to damage the waterproofing layer (i.e. expansion bolts should not be used for fixing to the waterproofing layer).
In terms of construction, it is necessary to ensure that the system durability is sufficient to cope with extreme weather conditions such as hail, lightning, typhoons and heavy snow, otherwise it is a hidden danger to roof and material safety for 20 years.
12. Can the cement tile structure of the roof support the weight of the photovoltaic system?
The weight of the photovoltaic system does not exceed 20 kilograms per square meter and is usually not a problem if the roof can support the weight of the solar heater.
14. How to deal with problems such as lightning strikes, hail and electricity leakage in home photovoltaic power generation safety?
First of all, equipment lines such as DC combination boxes and inverters have lightning and overload protection functions. It will automatically shut down and disconnect when abnormal voltages such as lightning strikes and leakage occur, so there is no safety problem.
Furthermore, all metal frames and handles on the roof are grounded to ensure safety in lightning storms. Secondly, the surface of the photovoltaic modules is made of ultra-strong impact-resistant tempered glass that has undergone rigorous testing (at high temperature and humidity) when certified by the European Union. In general weather conditions, photovoltaic panels are difficult to be damaged.
15. How do I determine if I can work in commercial photovoltaic systems?
Generally, the following information is needed for the assessment:
- The remaining years of the land lease or whether you own a parcel of land (with full documentation);
- Nature of electricity consumption and total annual electricity consumption;
- Total roof area and roof structure (cement, colored steel tiles, ordinary iron sheet).
16. What services are provided?
One-stop services such as scheme design, system equipment, transportation and installation, technical support for grid connection and after-sales service are offered.
17. What equipment does distributed photovoltaic power generation include?
Main equipment: solar panels, inverters, AC/DC distribution boxes, photovoltaic metering meter boxes, holders;
Auxiliary equipment: photovoltaic cables, AC cables, pipe clamps, lightning strips and lightning grounding. Large power plants also require transformers, distribution boards and other auxiliary equipment.
18. What is the installation area of distributed photovoltaic power generation?
Calculations are made based on the actual usable area of your roof. Take the 1KW example, for a pitched roof, an area of 8 square meters is required; for a flat roof, an area of 10 square meters is required. As the capacity increases, you can proceed accordingly.
19. How is my income calculated?
The income is made up of three parts: the electricity you use, national subsidies and income from the sale of electricity to electricity companies, with some local subsidies.