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Nowadays, more and more people have installed photovoltaic power stations for domestic use. Many people think that installing a power station is just as simple as installing a water heater. In particular, many new friends are not aware of the professionalism of photovoltaic power generation. Eager to buy their own products to install their own, or choose to buy from the service providers do not fly to install the product, resulting in spending money to invest in power plants can not pass the acceptance check.
In fact, photovoltaic power generation is a highly specialized industry, and the power generated by photovoltaic power plants must be delivered to large power grids. The power quality of the power plants must be guaranteed and the quality of power delivered must be good enough so as not to cause damage to the large power grid. Therefore, Although the grid welcomes domestic photovoltaic power stations, the audit is still relatively strict when it comes to acceptance. So, does the grid come to an end? Which parts are the most prone to problems? Do you need to pay attention to the successful acceptance?
So let's talk about the acceptance of this aspect of the grid connection today.
The acceptance of the power grid Step 1: Check the data
The main investigation data are as follows.
About the assembly: factory inspection report (indicating that this is a qualified component), product quality certification, and certification.
About the inverter: Certification and certification.
About distribution box: factory inspection report, China Compulsory Product Certification.
Regarding construction qualifications, the license for the installation (rehabilitation, test) of electrical facilities shall be provided. General area copies can be covered with official seals, and special areas need to take the original documents for the record.
It should be noted that the three ministries and commissions of the National Energy Administration, the Ministry of Industry and Information Technology and the National Certification and Accreditation Administration issued the "Opinions on Promoting the Application and Industrial Upgrade of Advanced Photovoltaic Technology Products" last year, which stipulates polysilicon battery components and monocrystalline silicon batteries. The photoelectric conversion efficiency of the components is not less than 15.5% and 16%, respectively. Therefore, if the selected component fails to achieve this efficiency, it may not be on the Internet.
Because of this provision, many counterfeits have appeared on the market. Before she mentioned in the “Five Big Secrets of Counterfeit Group Priceâ€, some of the service providers purchased low-efficiency components at a low price, and then posted them. Standards, change cards, inefficient components have become a highly efficient component. Therefore, the purchase of components must be purchased from reliable channels!
The second step: site acceptance
Mainly check the following aspects.
1. Whether the installation and construction of power lines meet the specifications.
For details, please refer to the photovoltaic power station construction specification. The following only extracts some points.
(1) Components
1 appearance is intact.
2 The connector connection between the components is firm.
3 whether the number of components connected and the path meet the requirements of the drawings.
(2) Inverter
Whether the installation direction meets the design requirements.
(3) Bracket
1 appearance and anti-corrosion coating is intact.
2 whether the model, specification, and material meet the design drawings.
3 Whether the inclination deviation is between ±1°.
2. Does the lightning protection grounding resistance comply with regulations? Typically between 5 ohms and 10 ohms.
3, whether the distribution box is under voltage loss tripping function. That is, in the event of a power outage in the large power grid, it can be ensured that the photovoltaic system stops working, and no power is transmitted back to the grid.
4. Whether the line installation complies with the industry norm.
One of the above issues, there is a problem, it may lead to unqualified acceptance, no serious problems can not be rework, serious, such as component efficiency is not up to standard, important products lack of relevant certification or certification, it really can not be connected to the network .
Therefore, to remind everyone to buy products must be bright eyes, ask in advance if the manufacturers have the relevant certification, if necessary, they must personally test the next, to avoid being deceived!
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