Basic concepts of the hottest household PV 10 ques

Basic concept of household photovoltaic 10 questions and 10 answers

it is estimated that there are more than 40million independent roofs in China, of which about 20million can install the roofs of photovoltaic power stations, with an installed capacity of 100gw. The huge and hot household photovoltaic market has attracted more and more photovoltaic enterprises and dealers. For ordinary people, they still know little about photovoltaic. Therefore, it is particularly important to understand the basic concept of household photovoltaic. Household photovoltaic sorts out the common basic concepts of household photovoltaic 10 questions and 10 answers as follows

1. What is household PV

photovoltaic power generation refers to the new energy power generation that uses the photoelectric characteristics of photovoltaic materials to convert the irradiation energy of light into electric energy (DC), and then integrates it into three-phase AC through inverter

unlike large-scale photovoltaic power stations, which are high-power and cover a wide area of land, household photovoltaic power generation refers to the process of placing photovoltaic panels on the top floor of a home or in a courtyard, using low-power or micro inverter for commutation, and directly using this new energy, or integrating excess power into electricity

there is no limit on the power level of household PV. The power level of household PV is determined according to the investment and load, that is, if there are many electrical equipment at home, you can add more photovoltaic panels to improve the system capacity; The more investment, the corresponding system level can also be improved. In addition, the anti disturbance and emergency capability of the system can be improved by adding battery packs

2. How to define the individual (family) installation of distributed photovoltaic power generation system

in principle, the distributed photovoltaic projects installed by individuals are for self use, residual power, and power regulation. For self-use photovoltaic power, it will automatically offset the power consumption and will not be traded. For surplus photovoltaic power, the company will purchase it at the local desulfurization coal benchmark price, and individuals will build distributed photovoltaic facilities as project units. In principle, the installed capacity of a single project is not greater than 30 kW, All provinces have competent energy departments to simplify project management as appropriate

3、 What is "spontaneous self use, surplus electricity" "?

spontaneous self use and residual power refers to that the power generated by the distributed photovoltaic power generation system is mainly used by the power users themselves, and the excess power is connected to the power. It is a business model of distributed photovoltaic power generation. For this operation mode, photovoltaic is connected to the load side of the user's electricity meter, and a photovoltaic reverse power transmission temperature 2 and relative humidity ≤ 80% are required. Zhouchangfeng artificial leather Co., Ltd. fully implements the measurement of the production of water-based synthetic leather Meter or set the electricity meter as a two-way measurement, and the photovoltaic electricity directly consumed by the user will directly enjoy the sales price of electricity in the way of saving electricity charges, and the reverse transmission electricity will be measured separately and settled at the specified upper price

4. What is the "benchmark price for photovoltaic" policy

the benchmark electricity price policy for photovoltaic power generation is based on the current cost of photovoltaic power generation and considering reasonable profits. Photovoltaic project developers sell photovoltaic electricity to power enterprises at such a price, which is higher than the benchmark electricity on local desulfurization coal-fired power units by 5-sample surface; The difference part of the price is fully amortized to make up for the power enterprises. The benchmark price policy on photovoltaic is mainly applicable to large-scale photovoltaic power stations

5. What is the subsidy for household PV in 2018? How much lower than 2017

on December 22, 2017, the national development and Reform Commission issued the notice on the price policy of photovoltaic power generation projects in 2018. For photovoltaic power stations that were put into operation after January 1, 2018, the benchmark electricity prices of class I, class II and class III resource areas decreased from 0.65 yuan, 0.75 yuan and 0.85 yuan in 2017 to 0.55 yuan, 0.65 yuan and 0.75 yuan per kilowatt hour, 0.1 yuan lower than that of 2017. For the distributed photovoltaic power generation put into operation after January 1, 2018, the subsidy standard for full power consumption is reduced to 0.37 yuan per kilowatt hour for the mode of "self use and surplus power", which is 0.05 yuan lower than the previous subsidy standard per kilowatt hour

specific to local governments, they are also widely active in enterprises, colleges and universities, research institutes, provincial subsidies and municipal subsidies. The situation is different in each place

6. What is a two-way meter? Why do I need a two-way meter

the two-way metering electric energy meter is an electric energy meter that can measure electricity consumption and power generation. Both power and electric energy have directions. From the perspective of electricity consumption, the power consumed is counted as positive power or positive energy, and the power generated is counted as negative power or negative energy. The meter can read the positive and negative electricity respectively through the display screen and store the electricity data

the reason for installing a two-way electricity meter is that the electricity generated by photovoltaic cannot be consumed by users, and the remaining electricity needs to be transmitted to electricity. The electricity meter needs to measure a number. When photovoltaic power generation cannot meet the needs of users, it needs to measure another number. Ordinary single meter cannot meet this requirement, so it needs to use a smart electricity meter with the measurement function of two-way electricity meter

7. What is the voltage of the user parallel system

the parallel voltage of household parallel system is generally 220V

the parallel voltage of distributed photovoltaic system is mainly determined by the installed capacity of the system, and the specific parallel voltage shall be determined according to the approval of the access system of the power company. Generally, 220V is selected for household use and 380V is selected for commercial use

8. What is the "snail pattern" of photovoltaic modules

snail pattern is a phenomenon that the oxidizer in EVA reacts with the silver grid line under the catalysis of high temperature, high humidity, light and cell crack, resulting in the white silver grid line becoming dark gray. The occurrence of snail pattern will lead to the cracking of the battery, and will further deteriorate the extension

9. What is the photovoltaic installed capacity

declared installed capacity refers to the applied capacity when users apply for electricity from the power supply enterprise. Declared installed capacity is the maximum capacity that the power supply enterprise allows customers to use at the same time

10. What is the new PV low-voltage installation for residents

residential PV low-voltage new installation refers to the distributed PV project in which residential customers apply for 380 (220) V voltage level access to electricity