First of all, we need to know the principles of grid-connected photovoltaic power generation systems and what equipment is needed.
1. Working principle of photovoltaic power generation system:
High-performance solar cell components are installed on the roof using brackets and are connected in series. and at the same time to form solar energy. The solar cell array absorbs sunlight and generates direct current, which is converted to alternating current for home use via the photovoltaic inverter and uploaded to the power grid.
2. System composition:
Mainly includes: photovoltaic modules, inverter, bracket, DC cable, AC cable, subsidized meter, two-way electricity meter
3. Market price:
The market price of photovoltaic systems is general8 to 12 yuan per watt. The cost of installing a 5 kW solar power generation system in an average household is around 40,000 to 60,000 yuan.
4. Income from domestic photovoltaic power generation includes three parts:
1. Earn money from subsidies: national subsidy of 0.42 yuan/kWh + province. subsidies + city and county subsidies Subsidies (slightly different depending on location), whether you use it yourself or sell it, as long as you produce electricity, you will be subsidized.
2. Save on your electricity bills: You can generate electricity for your own use without paying electricity bills, which is equivalent to saving money.
3. Earn money by selling electricity: unused electricity is sold to the state and the electricity price is based on the electricity reference price.ity of local coal desulfurization units, or around 0.56 yuan/kWh. (Electricity prices vary slightly from location to location).
5. Calculation of return on investment
Taking the Shandong category III area as an example, to install a 5KW domestic power plant, the investment will be around 40,000 yuan depending on the price of the market. It can generate an average of 20 kW/h per day and 7,300 kW/h per year. It is calculated based on 30% self-use and 70% sold to State Grid:
Subsidy income: 7,300*. 0.42 = 3,066 yuan (excluding provincial and prefecture-level subsidies)
Revenue from electricity bill savings: 7,300 * 30% * 0.52 (electricity bill 'electricity) = 1,138.8 yuan
Revenue from electricity sales: 7,200 * 70% * 0.35 = 1,764 yuan
In total, the income on one year is: 3066+1138.8+1764=5968.8 yuan
It takes almost 6 years to recover the The average operating life of a photovoltaic plant is 25 years, which is equivalent to 19 years of net profit.
Usually, a home photovoltaic power generation system consists of several parts such as photovoltaic panels, DC combiner box (optional), inverter and two-way electricity meter (provided free of charge by the electricity network). ). The price of photovoltaic modules on the market is generally between 8 and 12 yuan/watt. Therefore, the cost of a system and the entire solar power generation system is mainly determined by the installed capacity of the photovoltaic power generation system installed in the house. How much does it cost to invest in a solar power generation system installed in a typical home? It ranges from ten thousand to several hundred thousand.
Currently, the state and governmentsLocal s continue to increase photovoltaic subsidies, and subsidy policies are arising in various places. A rough estimate is that the cost of a set of equipment is between 30,000 and 50,000 euros. Taking Shanghai as an example, the annual power generation capacity of this system is about 3,000-5,000 kWh (based on Shanghai Rizhao as the standard). The current national electricity subsidy per kilowatt hour is 0.42 yuan/kWh, plus the Shanghai region subsidy of 0.4 yuan/kWh, the state will give you 3,000. The seller is National Grid. And if a photovoltaic electricity production installation is used for at least 25 years, you can benefit from a net income for more than ten years.
Generally speaking, it is more profitable to invest in photovoltaic energy production systems. In addition, the photovoltaic power generation system uses energysolar, a continuous source of clean energy, which is also of great importance for energy conservation and emission reduction. (This answer is referenced by solar energy expert Guangdong Sunbank New Energy)