What are PV panels?

Photovoltaic (PV) panels, also known as solar panels, are devices made from semi-conducting materials that allow the transformation of sunlight into electrical energy. The most commonly used semi-conducting material in PV panels is silicon, but other materials such as cadmium telluride and copper indium gallium selenide can also be used.

PV panels are made up of solar cells, which are responsible for converting sunlight into electricity. When sunlight strikes the solar cells, it excites the electrons in the material, creating a flow of electrons that can be captured as an electrical current. This current is then sent to an inverter, which converts the DC current produced by the solar cells into AC current that can be used to power homes and businesses.

How does a PV panel work?

The basic operating principle of a PV panel is based on the photoelectric effect, which was first discovered by Albert Einstein in 1905. When light falls on a metal surface, it causes the emission of electrons, which can be captured as an electrical current. In the case of a PV panel, the metal surface is replaced by a semi-conducting material, which is capable of absorbing sunlight and generating an electrical current.

The electrical current produced by a PV panel is DC current, which is not compatible with the AC current used in most homes and businesses. To make the electricity generated by PV panels usable, an inverter is needed to convert the DC current into AC current. The inverter is connected to the electrical grid, allowing excess electricity generated by the PV panels to be sold back to the utility company.

PV panels are a popular choice for renewable energy because they produce no emissions or pollution, require little maintenance, and can generate electricity even on cloudy days. They are also becoming increasingly affordable, making them an attractive option for homeowners and businesses looking to reduce their carbon footprint and save money on their energy bills.

Planning for Rooftop PV panels on London’s Homes

The Greater London Authority has made suggestions for each borough in London for the installation of rooftop PV panels. You can find the report here.

The Mayor of London has created an interactive map called The London Solar Opportunities Map, which allows Londoners to estimate the potential for both PV solar panels and solar thermal installations on buildings and open land around the capital. This map can be an invaluable tool for homeowners and businesses who are interested in installing solar panels, as