What are the main components of an off-grid photovoltaic system?

The core of an off-grid photovoltaic system is three main components: power generation (photovoltaic panels), energy storage (batteries), and power control (controllers + inverters). Auxiliary materials ensure safety, and optional modules can complete the application scenarios. 
The key to selecting a home photovoltaic system is to first clarify the electricity demand, and then match the power, voltage, and capacity of each component, prioritizing stability and compatibility, rather than blindly pursuing high power.