There are three types of home solar systems. One is off-grid, using batteries, which can support solar and city electricity; the second is grid-connected system, which can be sold when connected to the national grid. The third type is a hybrid network which combines the advantages of the first and second types.

The grid-connected system is relatively simple, that is, your photovoltaic system generates electricity directly to the grid, and the point where you use electricity is off the grid, and your home will have a two-way meter. The electricity bill is based on the difference between your grid-connected and off-grid electricity. Because the daily curve of photovoltaic power generation is not stable, it is difficult to achieve daily balance, so it is measured in years. You can look at your electricity bill for the previous year to calculate, and your electricity bill can be found. The daily power generation will be affected by the weather, but the annual power generation is relatively stable. The national average power generation is 1200-1300kWh/kWp, and the installed capacity is 1kW. The annual power generation is about 1200-1300 kWh. Suppose you use 10000 kWh a year, with 400W Take the component as an example, the installed capacity is about 20 yuan.
The off-grid system is more complicated. To achieve the daily balance of electricity, energy storage must be installed. At the same time, the power of your home appliances needs to be measured. The installed power is generally greater than the power of the home appliances. At the same time, energy storage systems and energy storage systems must be installed. The capacity should be calculated according to your electricity usage habits.
Hybrid grid systems should comprehensively consider the elements of off-grid and grid-connected solar systems.