FAQs guide to distributed pv system.



Photovoltaic power generation refers to the power generation method that directly converts solar radiation into electrical energy. Photovoltaic power generation is the mainstream of solar power generation today. Therefore, solar power generation is often referred to now as photovoltaic power generation. What is the distributed pv system? Next, I will give you the answers one by one.

1.What is distributed pv system

It is a new type of power generation and comprehensive utilization of energy with broad development prospects. It is different from traditional centralized power generation (thermal power generation, etc.) It can effectively provide the power generation of the same scale system, and also effectively solve the problem of power loss in boosting or long-distance transportation.

2.What are the advantages of photovoltaic power generation

Economical and energy-saving: generally self-generated and self-used, excess power can be sold to power supply companies through the State Grid, and the grid will supply power when it is insufficient. From now on, you can save electricity and get subsidies;

 Insulation and cooling: It can be insulated and cooled by 3-6 degrees in summer, and heat transfer can be reduced in winter;

 Green and environmental protection: During the power generation process of distributed pv system projects, there is no noise, no light pollution, and no radiation. It is a static power generation with zero emission and zero pollution in the true sense;

 Aesthetic personality: The perfect combination of architecture or aesthetics and photovoltaic technology makes the entire roof look beautiful and atmospheric, with a strong sense of technology, and enhances the value of the property itself.

3.Can i install a distributed pv system if the roof does not face south

It can be installed, but the power generation is slightly less, and the power generation is differentiated according to the direction of the roof. It's 100% if it faces south, maybe 70-95% if it's east-west, and 50-70% if it's north.

4.Need to do it yourself every day

No need at all, because the distributed pv system monitoring is fully automatic, it will start and shut down by itself, and there is no need to manually control it.

5.How can I get the income and subsidies from selling electricity

Taking China as an example, before connecting to the grid, the power supply bureau requires 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, a power purchase agreement will be signed 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 amount of electricity generated by the photovoltaic system

6.Is the light intensity the amount of electricity generated by the photovoltaic system

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

7.Does it affect the power generation if it rains or is cloudy

May have an impact. The amount of electricity generated will be reduced, because the light time is reduced and the light intensity is relatively weakened. If the average annual power generation (such as 1100 kWh/kw/year) can be achieved. And don't worry about insufficient household electricity, because the photovoltaic system is a power generation system connected to the national grid.

Once the distributed pv system fails to meet the owner's electricity demand at any time, the system will automatically remove electricity from the national grid for use. Electricity habits have gone from being totally dependent on the national grid to being partially dependent.

8.Does the dust on the surface of the system affect the power generation

The impact is very small, because the distributed pv system is related to the irradiance of the sun, and not obvious shadows will not have a significant impact on the power generation of the system.

Does the dust on the surface of the system affect the power generation

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. Therefore, the operation and maintenance costs of distributed pv systems are very limited.

9.Does the distributed pv system have light pollution

Does not exist. In principle, the photovoltaic system uses tempered glass coated with anti-reflection film to maximize light absorption and reduce reflection to increase power generation efficiency without light reflection or light pollution. The reflectivity of traditional curtain wall glass or automotive glass is 15% or more, while the reflectivity of photovoltaic glass from first-tier module manufacturers is less than 6%. Therefore, it is lower than the light reflectivity of glass in other industries, so there is no light pollution.

10.How to ensure the efficient and reliable operation of photovoltaic systems for 25 years

First, strictly control the quality in product selection, and must choose a first-line brand module manufacturer, so as to ensure that the module power generation will not have any problems for 25 years from the source:

25-year warranty on module power generation to ensure module efficiency

② Have a national laboratory (cooperating with the strict quality control system of the production line)

Large scale (the larger the production capacity, the larger the market share, and the more obvious the economies of scale)

④ Strong goodwill (the stronger the brand effect, the better the after-sales service)

Whether they only focus on solar photovoltaic (100% photovoltaic enterprises and enterprises with only subsidiaries doing photovoltaics have different attitudes towards the sustainability of the industry). In terms of system configuration, be sure to select inverters, combiner boxes, lightning protection modules, distribution boxes, cables, etc. with the best compatibility to match the components. Here you can refer to top 5 inverter battery companies.

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


Second, in terms of system structure design and fixing to the roof, choose the most appropriate fixing method, and try not to damage the waterproof layer (that is, the fixing method that does not use expansion bolts on the waterproof layer). In terms of structure, it is necessary to ensure that the system strength is sufficient to deal with extreme weather such as hail, lightning, typhoon, heavy snow, etc. Otherwise, it will be a 20-year hidden danger to the safety of the roof and property.

11.How safe is home photovoltaic power generation

First of all, DC combiner boxes, inverters and other equipment lines have lightning protection and overload protection functions. When abnormal voltage such as lightning strike and leakage occurs, it will be automatically turned off and disconnected, so there is no safety problem.

In addition, all metal frames and brackets on the roof are grounded to ensure safety in thunderstorms. Secondly, the surface of our photovoltaic modules is made of super impact-resistant tempered glass, which has undergone rigorous testing (high temperature and high humidity) when passing the EU certification.

How safe is home photovoltaic power generation

12.What equipment does distributed pv system include

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 require transformers, distribution cabinets and other auxiliary equipment.

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13.What is the installed area of distributed pv system

To calculate according to the actual area available for your roof, take 1KW as an example, the current sloping roof needs an area of 4 square meters; the flat roof needs an area of 5 square meters. If the capacity is increased, it can be deduced by analogy.

Related post: top 10 photovoltaic battery companies, top 10 inverter battery best companies.