Components of a solar system: Explanation of each component and its function

Last updated: October 17, 2026

The basic components of a solar system are: the panels that generate electricity, the inverter that converts it, the mounting structures that support the panels, the cables and protective devices that transport them safely, and finally, the batteries and charge controller in systems that require storage. Understanding the function of each component helps you understand the pricing and ask the right questions before purchasing.

Solar panels: a source of production

The panel is the component that converts sunlight into direct current (DC). It consists of silicon cells covered with tempered glass and surrounded by an aluminum frame, behind which is a small junction box containing diodes and cables with conductors.

What you need to know about the board's specifications:

• ability: Commonly used solar panels today are approximately 550 to 650 watts per panel.
• Dimensions and area: Approximately 2.2 to 2.4 meters x 1.1 to 1.3 meters, that is approximately 2.6 to 3.1 square meters per board.
• Heat modulus: The closer it is to zero, the better in our summer. On modern panels, it is approximately between −0.29% and −0.40% for every degree above 25°C.
• Warranty: Product warranty is typically 10 to 15 years, and performance warranty is 25 to 30 years with approximately 80 to 88% remaining capacity.

There are different types of panels such as single-crystal and double-sided, and each type has advantages that vary depending on the installation location and budget.

The inverter: the brain of the system

Household appliances operate on alternating current (AC) at 220 or 380 volts, depending on the wiring, while solar panels produce direct current (DC). An inverter converts the two, and its efficiency in good inverters is approximately 95 to 98%. Most modern inverters also utilize Maximum Power Point Tracking (MPPT) to extract the maximum possible power from the panels, taking into account variations in radiation and temperature.

Types of inverters according to the system

• On-grid inverter: It synchronizes with the network and exports the surplus to it, and automatically stops when it is interrupted to protect maintenance technicians.
• Off-grid inverter: It forms an independent network of batteries, suitable for rest areas and remote locations.
• Hybrid inverter: It handles panels, batteries, and the grid together, and continues to power critical loads during outages.
• Variable Speed Drive (VFD) for Submersible Pumps: The submersible motor is operated directly from the panels and changes its speed according to the available radiation.

The lifespan of an inverter is typically 10 to 15 years, which is less than the lifespan of solar panels. Read more for details. How to choose the right inverter for your system.

Storage: Batteries and charge controller

batteries

Not every system needs batteries. In a grid-tied system, the water is drawn from the grid at night, and in a submersible pump, water is stored instead of electricity. However, in a split-system and a hybrid system, the battery powers the loads after sunset.

• Lithium phosphate (LiFePO4): Approximately 3000 to 6000 cycles at a depth of discharge of 80 to 90%, and usually comes with a battery management system (BMS) that protects it from overcharging and over-discharging.
• Gel and lead: Approximately 500 to 1500 cycles, and the recommended depth of discharge is about 50%, meaning you are only using half its capacity to maintain its lifespan.

A more comprehensive comparison in the article Solar batteries: Lithium or gel?

Charge controller (charge regulator)

In systems containing batteries, their charging must be regulated to prevent damage. A charge controller takes electricity from the panels and charges the battery at the appropriate voltage and current for its type. There are two types:

• MPPT: It extracts the greatest power from the panels and allows for a higher panel voltage than the battery voltage, and is the most widely used today.
• PWM: Simpler and cheaper, and suitable for very small systems where the panel voltage is close to the battery voltage.

In many modern hybrid and separate inverters, the charge controller is integrated into the device, so it does not appear as a separate part in the price quote.

Stabilization structures: The forgotten foundation

The frame holds the panels at the correct angle and orientation for many years, and withstands wind, sandstorms, and heat. A weak or rusty frame can cause the panels to fall or break, so its age must match the lifespan of the panels.

Common types of structures

• Inclined concrete surfaces: Triangular structures raise the panels at an angle suitable for the city, such as approximately 24° in Riyadh.
• Metal surfaces: Installation on sandwich panels or sheet metal in warehouses and factories.
• Earth structures: For farms, large lands, and submersible pump systems.
• Raised structures: The panels are raised above the surface level to leave space underneath for use or to bypass the tanks.
• Carports: With T-shaped, cantilevered, or two-column designs, it provides shade and electricity.

At the MITS factory, we manufacture these structures from hot-dip galvanized steel with an aluminum option. You can estimate the structure best suited to your space from Solar Mounting Structure CalculatorDetails of the types are in the article. Solar panel mounting structures.

Transport, protection and measurement

Cables and connectors

Cables carry electricity from the panels to the inverter and then to the distribution panel. For DC power, specialized solar cables are used that are resistant to UV radiation and heat, with compatible and secure connectors. The cable cross-section is chosen based on the current and distance, as thin or long cables can cause voltage drops, power loss, and overheating at the connections.

Protection and grounding devices

These parts do not increase production, but they protect the system, the home, and the people:

• DC circuit breakers and fuses: Each series of panels protects against overcurrent.
• DC disconnect switch: To safely disconnect the panels from the inverter during maintenance.
• Lightning and Transient Voltage Protection (SPD): On both DC and AC sides.
• AC switch: Between the inverter and the distribution panel.
• Grounding: Connecting panel frames, structures, and equipment to a sound grounding system.

Counter and monitoring

In grid-tied systems, a two-way meter is installed to measure what the system draws from the grid and what it exports. This is done by the Saudi Electricity Company as part of the connection process. As for monitoring, most modern inverters allow for mobile monitoring of production, which helps detect early signs of reduced output due to dust or other faults.

Summary table: Components by system type

If you want to delve deeper into the design of these components and how they are connected, there are Solar System Design Course Free at MITS Academy, and you can check it out Solar energy products Available.

Frequently Asked Questions