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 about 40,000 to 50,000 yuan (the price of top-tier brands).
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 electricity bills: Use your own electricity and don't have to pay electricity bills, which equals saving money.
3. Earn money by selling electricity: Unused electricity is sold to the state, and the electricity price is about 0.56 yuan/kWh, onthe basis of the reference price of electricity from local coal-fired desulfurization units. (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
Itut 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.
The unit price of photovoltaic solar modules is generally calculated based on power (watts) rather than square meters. If one square meter of polycrystalline silicon module is about 150W and the market price is 4 yuan/watt, the price per square meter is about 600 yuan. The specific price and effectiveness should be determined based on the manufacturer.