For those friends who are willing to install residential distributed power plants, they may not understand PV power plants, and there are some common problems in terms of the construction and profitability of distributed power plants. Some common questions are answered and answered for your friends' reference.
1. Is it necessary to re-wiring?
Basically do not need to re-wiring. The power of photovoltaic power generated by a home will not exceed 5 KW, usually about 3 KW, while the wiring power of the average home is above 5 KW.
2. Is the cost of home photovoltaic power generation controllable?
The income consists of three parts, the degree of electricity subsidy 0.42 * generated by the amount of electricity + desulfurization out of electricity * on-grid electricity + users own electricity prices * users own electricity. The investment return rate is about 12.5%, the investment recovery period is about 7-8 years, and some provinces and cities have local provincial and municipal subsidies, and the return period will be greatly shortened. Take Shanghai as an example. The return period is about 4-5 years. System life is about 25 years.
System investment, the current total installed cost of the project is about 10 yuan per watt.
3, how to turn voltage into lighting 220V voltage?
Photovoltaic power generation means that the components generate DC power, which is converted into power-frequency AC power through an inverter and then integrated into the power grid. The grid-connected access point will be connected to the grid where the installation site is located. The generated electricity is given priority to the load of the installation site, and excess electricity is uploaded and sold to the grid.
4, how to avoid lightning?
The lightning protection consists of two parts. One is the lightning protection of the roof components, the frame borders are connected, and finally the roof lightning protection network is connected. The second is the DC lightning protection device installed at the DC input of the inverter equipment, and the AC output is installed with AC protection. Thunder.
5. Is it illegal to install small-area photovoltaic panels outside the balcony in violation of relevant laws and regulations?
Can be installed on the balcony, anyway, the extremely powerful urban management forces can not control this piece, of course, you can install the roof of your home, if it is a community, you need to obtain the consent of the property, the specific requirements, please refer to the power company issued a distributed access system opinion.
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