Many people have the idea of using solar panels to generate power, but lots of friends still have a vague understanding of solar power generation. So specifically, what kinds of solar power systems are there? 
In general, solar power generation systems can be divided into three categories, including on-grid systems that supply power to the grid, off-grid systems that are not connected to the grid, and hybrid systems that can be freely connected to grid or not. Each system has its own structure and characteristics.
The on-grid system is composed of photovoltaic cells and on-grid inverters. The energy is directly input into the public grid through the on-grid inverter without battery energy storage. Such as ground power stations, industrial and commercial roofs, etc. The purpose is usually to sell electricity to grid operators for profit.
Grid-connected systems can be further subdivided into distributed and centralized systems.
Distributed photovoltaic power generation refers to photovoltaic power generation facilities that are constructed near users and operate in the way of self-consumption, surplus power transfer into grid or fully transfer to grid, and are characterized by balanced adjustment in the power distribution system. Connecting to the power grid at 220V, 380V, and 10kv levels can not only effectively increase the power generation of photovoltaic power plants of the same scale, but also effectively solve the problem of power loss in boosting and long-distance transportation.
The centralized large-scale grid-connected photovoltaic power station refers to the use of large-scale photovoltaic power stations in a centralized manner usually build by the country. The centralized large-scale grid-connected photovoltaic power station is generally a national-level power station. The centralized power station has a larger scale and higher power generation. 
The off-grid system is composed of solar panels, controllers, inverters, battery packs and support systems. It is characterized by a battery pack for energy storage, which is suitable for areas where there is no grid or unstable grid-connected power. For example, household and commercial solar energy storage power supply systems, solar street lights, solar mobile power supplies, solar calculators, solar cell phone chargers, etc.
Hybrid system, also known as off-grid system
It has the function of automatic operation of two-way switching. First, when the photovoltaic power generation system is insufficient in power generation due to cloudy, rainy days and its own failure, the switcher can automatically switch to the power supply side of the grid, and the power grid supplies power to the load; second, when the power grid suddenly fails for some reason, The photovoltaic system can automatically separate from the power grid, and become the working state of an independent photovoltaic power generation system. Some switching type photovoltaic power generation systems can also disconnect when need, and supply power for the general loads, and connect the power supply to the emergency load. Usually off-grid power generation systems are equipped with energy storage devices.
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