The mains components of a solar system are as follows:

Solar Panels themselves, also known as PV units

The visible part of the system that is used to harvest solar energy.

Inverter

The inverter converts DC energy into usable AC energy.

Power Optimiser

A power optimiser will help maximise the amount of energy your system is capable of producing.

Battery

Batteries are an optional extra in a solar system, but provide a solution to the storing of energy, thus maximising the flexibility of your system and your reliance on the national grid.

Software

Any system will include user interface software that enables your system to be controlled and managed via an app. Software will not only inform you of the amount of energy being harvested, but also of any faults that may occur in your system.