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Photovoltaic power generation 19 questions, which are all the questions you want to ask!

June 21,2023

What is distributed photovoltaic power generation?

Distributed photovoltaic power generation specifically refers to photovoltaic power generation facilities that are built near the user's site, and whose operation mode is characterized by self-consumption on the user side, surplus electricity connected to the grid, and balanced adjustment in the power distribution system. Distributed photovoltaic power generation follows the principles of adapting measures to local conditions, clean and efficient, decentralized layout, and nearby utilization, making full use of local solar energy resources to replace and reduce fossil energy consumption.

It advocates the principles of nearby power generation, nearby grid connection, nearby conversion, and nearby use, which effectively solves the problem of power loss during boosting and long-distance transportation.


What are the advantages of photovoltaic power generation?

Economical and energy-saving: generally self-contained, the excess electricity can be sold to the power supply company through the national grid, and when it is insufficient, it will be supplied by the grid, so you can get subsidies for saving electricity bills;

Insulation and cooling: In summer, it can insulate and cool down by 3-6 degrees, and in winter it can reduce heat transfer;

Green and environmental protection: During the power generation process of the distributed photovoltaic power generation project, there will be no light pollution, and it is a static power generation with zero emission and zero pollution in the true sense;

Beautiful personality: the perfect combination of architecture or aesthetics and photovoltaic technology, so that the entire roof looks beautiful and atmospheric, with a strong sense of technology, and enhance the value of the real estate itself.

If the roof is not facing south, is it impossible to install a photovoltaic power generation system?

It can be installed, but the power generation is slightly less, and the power generation is differentiated according to the direction of the roof. South facing is 100%, east-west maybe 70-95%, north facing 50-70%.

Do you need to do it yourself every day?

It is not necessary at all, because the system monitoring is fully automatic, it will start and close by itself, without manual control.

How can I get the income and subsidies from selling electricity?

Before connecting to the grid, the power supply bureau needs you to provide your bank card number so that the local power supply bureau can settle monthly/every three months; when connecting to the grid, it will sign a power purchase agreement with the power supply company; after connecting to the grid, the power supply bureau will take the initiative to settle with you.

Is the light intensity the power output of my photovoltaic system?

The intensity of light is not equal to the power generation of the local photovoltaic system. The difference is that the power generation of the photovoltaic system is based on the local light intensity, multiplied by an efficiency coefficient (performance ratio), and the actual power generation of the photovoltaic system used locally is obtained. This efficiency system is generally below 80%, close to 80% The system is a relatively good system. In Germany, the best systems may achieve a system efficiency of 82%.


Will it affect the power generation in rainy or cloudy days?

will affect. Because the light time is reduced, the light intensity is also relatively weakened, so the power generation will be relatively reduced.

On rainy days, the power generation of the photovoltaic system is limited. Is my home electricity enough?

This worry does not exist, because the photovoltaic system is a power generation system connected to the national grid. Once the photovoltaic power generation cannot meet the owner's electricity demand at any time, the system will automatically take electricity from the national grid for use. It is just that the household electricity habit has changed from completely Reliance on the national grid became partial dependence.

If there is dust or garbage on the surface of the system, will it affect the power generation?

There will be an impact, because the photovoltaic system is related to the irradiance of the sun, but the inconspicuous shadow will not have a significant impact on the power generation of the system. In addition, the glass of the solar module has a surface self-cleaning function, that is, in rainy days, the rainwater can wash away the dirt on the surface of the module, but it is worth noting that objects with large covering areas such as bird droppings and leaves need to be cleaned in time. Therefore, the operation and maintenance cost of photovoltaic system is very limited.

Does the photovoltaic system have light pollution?

Does not exist. In principle, the photovoltaic system uses tempered glass coated with an anti-reflective coating to maximize light absorption and reduce reflection to increase power generation efficiency. There is no light reflection or light pollution. The reflectivity of traditional curtain wall glass or automobile glass is 15% or above, while the reflectivity of photovoltaic glass produced by first-tier module manufacturers is below 6%. Therefore, it is lower than the light reflectance of glass in other industries, so there is no light pollution.

How to ensure the efficient and reliable operation of the photovoltaic system for 25 years?

First, strictly control the quality of product selection, and brand module manufacturers guarantee that there will be no problems with the power generation of modules for 25 years:

① 25-year quality assurance for power generation and power of modules to ensure module efficiency ② Possess a national laboratory (cooperate with the strict quality control system of the production line) ③ Large scale (the larger the production capacity, the larger the market share, the more obvious the economies of scale) ④ Strong reputation ( The stronger the brand effect, the better the after-sales service) ⑤Whether to focus only on solar photovoltaics (100% photovoltaic companies and companies that only have subsidiaries doing photovoltaics have different attitudes towards industry sustainability). In terms of system configuration, it is necessary to choose the most compatible inverter, combiner box, lightning protection module, distribution box, cable, etc. to match the components.

Second, in terms of system structure design and fixing to the roof, choose the most suitable fixing method, and try not to damage the waterproof layer (that is, the fixing method without installing expansion bolts on the waterproof layer), even if it needs to be repaired, there will be hidden dangers of future water leakage. In terms of structure, it is necessary to ensure that the system is strong enough to cope with extreme weather such as hail, lightning, typhoon, and heavy snow, otherwise it will be a 20-year hidden danger to the roof and property safety.

The roof is made of cement tiles, can it bear the weight of the photovoltaic system?

The weight of the photovoltaic system does not exceed 20 kg/square meter. Generally, as long as the roof can bear the weight of the solar water heater, there is no problem


After the system is installed, how can the power supply bureau accept it?

Before system design and installation, a professional installation company should assist you to apply to the local power supply bureau (or 95598) for suitable installed capacity, and start construction after submitting the owner’s basic information and personal distributed photovoltaic application form. After completion, notify the power supply bureau. Within 10 days, The power company will send technicians to check and accept the project on site, and replace the photovoltaic two-way meter for free to measure the power generation for subsequent subsidy settlement and payment.

Regarding the safety of photovoltaic power generation at home, how to deal with problems such as lightning strikes, hail, and electric leakage?

First of all, equipment circuits such as DC combiner boxes and inverters have lightning protection and overload protection functions. When abnormal voltages such as lightning strikes and electric leakage occur, it will be automatically shut down and disconnected, so there is no safety problem. Moreover, all metal frames and brackets on the roof are grounded to ensure safety in thunderstorm weather. Secondly, the surface of photovoltaic modules is made of super impact-resistant tempered glass, which has undergone harsh tests (high temperature and high humidity) when passing EU certification, and it is difficult to damage photovoltaic panels in general weather.


How to judge whether I can do industrial and commercial photovoltaic systems?

Provide the following information, and [send a message] at the end of the article to contact us for your professional evaluation

1. The remaining number of years of the land lease, or whether it is a self-owned plot (with complete certificates);

2. The nature of electricity consumption and the total electricity consumption throughout the year (you can use the Southern Power Grid electricity bill as a reference);

3. Total roof area and roof structure (cement, color steel tile, ordinary iron sheet).

What services do you provide?

Provide one-stop service, including scheme design, system equipment, transportation and installation, technical support for grid connection and after-sales service, etc.

What equipment is included in distributed photovoltaic power generation?

Main equipment: solar panels, inverters, AC and DC distribution boxes, photovoltaic meter boxes, brackets;

Auxiliary equipment: photovoltaic cables, AC cables, pipe clamps, lightning protection belts and lightning protection grounding, etc. Large-scale power stations also need other auxiliary equipment such as transformers and distribution cabinets.


What is the installation area of distributed photovoltaic power generation?

It should be calculated according to the actual area available for your roof. Taking 1KW as an example, the sloped roof needs an area of 8 square meters; the flat roof needs an area of 10 square meters. If the capacity is increased, it can be deduced by analogy.