First, the working principle of photovoltaic power generation system:
High-performance solar cell modules are centrally installed on the roof through brackets, and a solar cell array is formed through series-parallel connection. The solar cell array absorbs sunlight to generate direct current, which is converted into alternating current by photovoltaic inverter for household use and uploaded to the power grid.
Second, the system structure:
It mainly includes: photovoltaic modules, inverters, brackets, DC cables, AC cables, subsidized meters and bidirectional meters.
Third, the market price:
The market price of photovoltaic system is generally 8- 12 yuan per watt. The average family installs a 5KW solar power generation system, and the cost is about 40,000-60,000 yuan.
Four, the benefits of household photovoltaic power generation include three parts:
1, subsidies to make money: State subsidies 0.42 yuan/kwh+provincial subsidies+city and county subsidies (slightly different from place to place), whether for your own use or for sale, as long as the generated electricity is subsidized.
2, power saving: power generation for personal use, no need to pay electricity bills, equivalent to making money.
3. Selling electricity to make money: the inexhaustible electricity is sold to the country. According to the benchmark electricity price of local coal-fired desulfurization units, the selling price is about 0.56 yuan/kWh. (Electricity prices vary slightly from place to place).
Verb (abbreviation of verb) calculation of investment return
Take the third-class area in Shandong as an example, install a 5KW family power station, and invest about 40,000 yuan at the market price. On average, it can deliver 20kw/h a day, and 7300kw/h a year according to the calculation that 30% is for personal use and 70% is sold to the State Grid:
Subsidy income: 7300*0.42=3066 yuan (excluding provincial and municipal subsidies)
Save electricity fee income: 7300*30%*0.52 (electricity fee) = 1 138.8 yuan.
Revenue from electricity sales: 7200*70%*0.35= 1764 yuan.
The combined annual income is 3066+1138.8+1764 = 5968.8 yuan.
It can return to its original cost in almost six years, and the average running time of photovoltaic power plants is 25 years, which means that the next 19 years are net income.