The cost of solar panel battery lithium PV power stations depends on three factors:
1. Equipment cost. That is, photovoltaic inverter, solar panel, etc.
Different photovoltaic installation companies have their own pricing standards. At present, the reasonable construction cost of 10kw battery photovoltaic systems is generally about 8-10 yuan per watt. PV modules account for about 49% of the total investment, inverters and other electrical equipment account for about 10%, and cables and supports account for about 10% respectively. These items account for a high proportion.
2. Installed capacity.
How to calculate the installed capacity of your home? Two main points to look at: monthly electricity consumption and installable area. According to the current actual power consumption, it is economical to judge how many kilowatts of photovoltaic power stations need to be installed. It is also possible to build a power station with a little more power, so that the electricity that is not used up can be connected to the grid and sold to the state.
Calculation method: Each kilowatt photovoltaic power generation system can generate about 4 kilowatt hours of electricity every day, requiring 10 square meters of installation area. As long as the power generation of the photovoltaic power station is greater than the household power consumption, it can drive all the household appliances.
For example, 360 degrees of electricity is used every month at home, and the roof can be installed with an area of 50 square meters. According to the calculation method, a 20KW photovoltaic battery storage power generation system can be installed at home to meet all monthly electricity consumption, with an installation area of 30 square meters. If you want to make full use of the roof of your home, you can install a 5KW photovoltaic power generation home battery storage system at most, which can not only meet the needs of your home, but also upload surplus electricity to the national grid to make money selling electricity.
3. Revenue from solar power stations.
The income of domestic solar photovoltaic power wall stations includes three parts:
1. Subsidies to make money: the national subsidy is 0.42 yuan/kWh+provincial subsidy+city/county subsidy (slightly different from place to place). No matter you use or sell it, you can get subsidies for all the electricity you generate.
2. Save electricity bills: generate electricity for your own use without paying electricity bills, which is equivalent to making money.
3. Make money by selling electricity: sell the electricity that is not used up to the state. The solar panel battery cost shall be subject to the benchmark price of local coal-fired desulfurization units. The price of electricity varies slightly from place to place.
There are two modes for household photovoltaic power stations to be connected to the power grid:
1) Spontaneous self use, surplus power online (self use is preferred, and the surplus is sold to the state)
2) Full access to the Internet (all generated electricity is sold to the state)
At present, most families will choose the mode of full access to the Internet, because according to the current subsidy standard, the electricity sales income of full access to the Internet is higher than that of the mode of self use surplus electricity. However, with the continuous reduction of subsidies and electricity price standards, it will be more cost-effective to use surplus electricity for self use in the future.