Solar panel installers are professionals focused on installing solar power, or photovoltaic (PV), systems for industrial, commercial or domestic customers. Solar panels are one element in these total systems. In addition to installation, some installers provide advisory services assisting customers decide on a system design that best matches their needs. Selecting an installer is an important decision.
Panel installers are skilled trades men and women. They are usually qualified plumbers or electricians. A peak industry association usually certifies installers. A listing of certified installers is usually available from the certification body.
It is important to differentiate a solar cell from a panel. A photovoltaic (PV) cell is technologically very sophisticated being a specialized semiconductor diode, a device that conducts electricity in one direction. The PV cell converts sunlight, infrared or ultraviolet radiation, into electricity. It collects sunlight and converts that energy into electricity.
By contrast, a panel is far less technologically unsophisticated. It represents a number of cells linked or wired together into one integrated unit. In simple terms, the cell is the real engine while the panel is merely the chassis.
Both cells and panels are produced in varying sizes. Cell size does not inherently affect efficiency. Cells can range from the being nano-sized, the thickness of a human hair with length and width not much larger; or they can be several feet long and wide. Panel size varies according to the cells mounted within them. Panels do not have any real size limits apart from practical requirements relating to handling, transportation and installation.
Panels are typically positioned on roofs or purpose-built ground-based racks. To maximize their exposure to sunlight, panels are installed to face north in the southern hemisphere and vice versa. To maximize their efficiency, they are inclined at about thirty degrees toward the sun.
Recent research suggests a new shape of cell is likely to raise its overall efficiency. In the past, cells have mostly been shaped as squares, or nearly so. However, studies have indicated cells that are long and narrow in shape are less likely to become non-operational due to shade. These results are not definitive. Nevertheless, they seem to be sufficiently compelling to encourage some manufacturers to produce so-called amorphous cells that are shaped as rectangles rather than squares.
In practice, most residential PV systems are grid connected meaning they are plugged-in to the mains public electricity grid. If a residential PV system generates electricity surplus to the requirements of the household, that surplus is sold to the grid. The household receives a monetary credit for that supply. Conversely, the household can draw supply from the grid during night hours or low sun periods if required. Solar panel installers are capable of connecting a PV system to the grid.
Solar panel installers are highly trained professionals. Get the ultimate inside scoop on simply the best installers now in our complete guide to everything you need to know about solar panels and solar electricity .
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