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How Solar PV panels work?

Solar panels are made from semi-conductor material, which has been chemically modified to act as adiode, i.e. the material will allow current (electrons) to flow in one direction only. Electrical connections to the panel are made to either side of the diode. When light strikes the panel, its’ energy dislodgeselectrons from atoms in the semiconductor. These electrons escape, and because of the diode effect, can only travel in one direction out of the panel. After passing through the inverter, where the electrons give up the energy they have absorbed from sunlight, they are returned to the other side of the diode, to fill the holes they left behind when first formed. (Click on the magnifying glass below to see how it works).

The power of a solar cell is measured in kilowatts peak (kWp). Based on an independent laboratory test, this figure is around the rate at which it generates energy at peak performance in full direct sunlight during the summer. PV cells come in a variety of sizes and power ratings, and our surveyors will match the power of the panels and size to the dimensions of your roof.

Each panel is about 1 meter by 1.5 meters can be mounted in landscape or portrait format, and will generate typically 0.25 kWp. A 4 kWp system needs 16 panels and a roof area of around 24 square meters (8 metres by 3 or 2 metres by 12 etc.)