Photovoltaic solar energy explained: Everything you need to know about PV, panels, and cells

Photovoltaic solar energy and its role in modern power generation

Photovoltaic solar energy is a renewable technology that converts sunlight directly into electricity using semiconductor materials inside solar panels. When sunlight hits these panels, it releases electrons in the semiconductor, creating an electric current.

This current is direct current (DC), which is then converted by an inverter into alternating current (AC) for use in homes and businesses, or for feeding into the grid.

Solar PV systems are highly versatile, powering everything from residential rooftops and commercial buildings to large-scale solar farms and portable devices. They offer a clean, low-maintenance, and cost-effective way to generate electricity.

Frequently asked questions about photovoltaic solar energy

What is photovoltaic glass?

Photovoltaic (PV) glass is a type of glass that generates electricity while still functioning as a building material. It is mainly used in windows, facades, skylights, curtain walls and Agrivoltaics with solar cells built into transparent, laminated layers. PV glass enables buildings to generate clean energy without sacrificing natural light, insulation, or noise reduction.

What is the meaning of PV in solar energy?

The term “PV” in solar energy stands for “photovoltaic.” The word comes from “photo,” meaning light, and “voltaic,” relating to the production of electricity. Thus, photovoltaic technology refers to the process of converting sunlight into electrical energy using semiconductor materials.

When sunlight hits a photovoltaic cell, it causes electrons to move, generating a flow of electricity. PV technology is used in solar panels, also called PV modules, which are found in a variety of applications, from rooftop installations, ground-mounted systems to solar farms to portable devices.

The primary benefit of PV systems is their ability to provide clean, renewable power with minimal maintenance, helping reduce both electricity bills and carbon emissions.

How does a photovoltaic panel work?

The term “photovoltaic” combines “photo” (light) and “voltaic” (electricity), highlighting the process by which these panels generate power.

Each panel contains multiple photovoltaic cells, which are wired together to form a module. When sunlight strikes these cells, it excites electrons, generating an electric current.

PV panels are typically installed on rooftops or grouped in arrays on the ground to provide electricity for homes, businesses, or to feed into the grid.

The panels are part of a larger system that often includes inverters to convert the produced direct current (DC) into usable alternating current (AC).

Choosing the best PV panels for your needs

When considering the best PV panels for commercial use, 4 factors come into play, including:

Efficiency

Cost-effectiveness

Durability

Adaptability

Commercial solar PV panels are specifically designed to help businesses reduce utility costs and improve sustainability.

The initial investment for a solar PV installation can range from £650/kWp to £950/kWp, but businesses benefit from long-term savings, especially as energy prices rise. Government incentives and tax benefits can further improve the return on investment.

The materials and components inside photovoltaic panels

Photovoltaic (PV) panels are primarily made of crystalline silicon, a key semiconductor material that converts sunlight into electricity.

Around 95% of PV panels use either monocrystalline or polycrystalline silicon cells, both derived from purified sand.

The silicon cells are protected by a robust layer of tempered glass, which accounts for 70- 80% of the panel’s composition, allowing sunlight to reach the cells while providing durability. The frame is typically constructed from lightweight aluminium, offering structural support and ease of installation.

Plastic polymer films, such as ethylene vinyl acetate (EVA), encapsulate the cells, shielding them from moisture and dirt. Copper wiring conducts the generated electricity, and silver paste is used to create conductive electrodes on the cells.

Finally, a polymer backsheet serves as an electrical insulator and protects the panel’s rear. Together, these materials make sure the panel’s efficiency, longevity, and resistance to environmental factors.

Photovoltaic cells: The building blocks of solar power

PV cells are the basic units that make up solar panels and are usually made from crystalline silicon, though thin-film cells are used for some applications.

Each cell has layers for collecting electrons, an anti-reflective coating to absorb more light, and a glass cover for protection.

Monocrystalline cells are known for their high efficiency, while polycrystalline cells are valued for their cost-effectiveness.

Thin-film cells are flexible and used in special cases. PV cells are used in everything from small gadgets to large solar power plants, making them key to clean, renewable energy.

Solar PV vs other energy sources

Solar PV provides a renewable and reliable source of electricity, unlike traditional energy sources such as coal or natural gas, which are finite and contribute to carbon emissions.

Unlike wind turbines, solar panels operate silently and have no moving parts, resulting in lower maintenance requirements and minimal disruption to daily operations.

While solar thermal systems are primarily designed for water heating, PV systems generate electricity for a wide range of applications, from powering equipment to supporting facility operations.

Key future trends in solar photovoltaic technology

Bifacial Solar Panels designed to capture sunlight on both sides, which can significantly increase energy generation compared to standard panels.

The use of Larger Wafers, such as 182 mm and 210 mm, enabling the production of high-power solar modules with capacities ranging from 600W to 720W.

Building-Integrated Photovoltaics (BIPV) and Flexible Solar Solutions changing the way buildings generate energy.

Artificial intelligence and IoT Technologies are now being used to improve solar energy production, monitor system performance, and manage battery storage.

PV Thermal (PVT) Systems: Hybrid systems that produce electricity while capturing waste heat for hot water, reaching up to 90% total efficiency, are gaining traction in the UK.

Sustainable Manufacturing & Recycling: As installations grow, the industry is prioritising the development of fully recyclable solar panels and lower-carbon manufacturing processes.

Getting Started with photovoltaic solar energy

If you are considering solar PV for your business, the process begins with a thorough assessment of your energy requirements and system size.

Working with an experienced solar installer is important to make sure the system is correctly sized and positioned for maximum performance. With professional installation and ongoing support, adopting Photovoltaic solar energy is a straightforward way to reduce energy costs and support sustainability goals.

Are you ready to improve your energy independence while supporting a cleaner planet?

Solar PV technology offers a practical, reliable, and environmentally friendly way to produce electricity and reduce your carbon footprint.