Systems' parts:

1.PV array: some PV panels connected in series and  in parallel giving a DC output out of the incident irradiance. Orientation and tilt of the panels are important design parameters,as well as shading from surrounding obstuctions.

2.Solar controller:control battery bank charge and discharge reasonable and safty.

3.Battery Bank: can be a single battery or multiple batteries connected together  to creat essentially one large battery of the required voltage and amp-hour capacity. In some ways the battery configuration and capacity are the most important electrical power decision to make, and a wise choice can help you guarantee a steady supply of electrical power as well as a system that is simple to operate and maintain.

4.Inverter: An inverter can invert the DC power from solar system into AC power.