How much can household solar photovoltaic power generation save?

1, equipment cost. At present, the reasonable construction cost of photovoltaic system is generally around 8- 10 yuan per watt. Photovoltaic modules account for about 49% of the total investment, inverters and other electrical equipment account for about 65,438+00%, cables and brackets each account for about 65,438+00%, and these sub-items account for a high proportion.

2. Installed capacity. Mainly look at two points: monthly electricity consumption and installable area. It is economical to judge how many kilowatts of photovoltaic power plants need to be installed according to the current actual electricity consumption.

You can also build a slightly higher power station, so that inexhaustible electricity can be connected to the power grid and sold to the country. Calculation method: Each kilowatt photovoltaic power generation system can generate about 4 kWh per day, and the installation area is required to be 10 square meter. As long as the photovoltaic power station generates more electricity than the electricity consumption in the home, it can drive all the appliances in the home. For example, the electricity consumption at home is 360 degrees per month, and the roof can be installed with an area of 50 square meters. According to the calculation method, installing a 3KW photovoltaic power generation system at home can meet all the electricity consumption for one month, with an installation area of 30 square meters. If you want to make full use of the roof of your home, you should install a 5KW photovoltaic power generation system at most, which can not only meet the electricity demand of your home, but also upload the surplus electricity to the State Grid and sell it to make money.

3. Revenue of solar power station. The income of household solar photovoltaic power plants includes three parts: 1, and making money by subsidies: state subsidies of 0.42 yuan/kwh+provincial subsidies+city and county subsidies (slightly different from place to place), whether for personal 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, and the price of selling electricity is implemented according to the benchmark electricity price of local coal-fired desulfurization units, and the electricity price varies slightly from place to place.

There are two modes for household photovoltaic power plants to be connected to the grid: 1) spontaneous self-use, and the surplus power is connected to the grid (priority is given to self-use, and the surplus power is sold to the country). 2) All electricity is connected to the grid (all generated electricity is sold to the country). At present, most families will choose the all-electric grid-connected mode, because according to the current subsidy standard, the sales income of all-electric power is higher than the surplus power for spontaneous use. However, with the continuous reduction of subsidies and electricity price standards, it will be more cost-effective to use surplus electricity for personal use in the future.