A solar panel is one component of a photovoltaic system that is constructed out of a series of photovoltaic cells arranged into a panel. They come in a variety of rectangular shapes and are installed in combination to generate electricity. Solar panels, sometimes also called photovoltaics collect energy from the Sun in the form of sunlight and convert it into electricity that can be used to power homes. These panels can be used to supplement a home's electricity or provide power at remote locations.
In addition to residential use, there is also large-scale industrial use of solar panels. In this case, a large number of solar panels are arranged into a solar array, which is used to collect large amounts of sunlight to provide a large number of people with electricity generated there. This large scale use of solar power is not seen largely worldwide, but interest in alternative forms of energy is growing.
The main component of any solar panel is a solar cell. Specifically, a number of solar cells are used to build a single solar panel. These cells are the actual part of the device that convert the sunlight into electricity. Most solar panels are made from crystalline silicon type solar cells. These cells are composed of layers of silicon, phosphorous, and boron (although there are several different types of photovoltaic cells). These cells, once produced, are laid out into a grid pattern. The number of these cells used depends largely on the size of the panel being created, as many different sizing options exist.
Once the cells are laid out, the panel itself is sealed to protect the cells within and covered with a non-reflective glass. This glass protects the solar cells from damage, and is non-reflective to ensure sunlight can still reach the cells. Once sealed, this panel is placed into a rigid metallic frame. This frame is designed to prevent deformation, and includes a drainage hole to prevent water from building up on the panel. A buildup of water could reduce the efficiency of the panel. Additionally, the back of the panel is also sealed to prevent damage.
Solar panels act as a way to mount a series of solar cells so that their unique properties can be used to generate electricity. Once mounted, a proper orientation is chosen so that the solar panel faces in a direction that would collect the most solar energy at any point in the day. Since solar panels use the abilities of a number of photovoltaic cells combined to produce electricity, these solar panels act as a device to hold these cells. Individual cells absorb photons from the Sun, which results in an electric current being produced in the cell through a phenomenon known as the photovoltaic effect.
Most homes have enough roof area to hold enough solar panels to supply all of its power needs. An inverter is used to convert the direct current generated by a solar panel into alternating current. Combined, these two technologies create a photovoltaic system.