Photovoltaics (photo from light and voltaic as a measure of electrical potential) allows for the conversion of light into electricity. Scientists working on space related projects, decades ago, discovered that silicone cells (wafers) could generate electricity if exposed to light. The amount of electricity generated by one cell is relatively small, so, more commonly, 60 cells are arranged to form a module or solar panel with an output typically of 250 - 350 watts. A number of solar panels connected together becomes an array producing a useable quantity of electricity. The electricity generated is in the form of DC (Direct Current) and this must be converted to AC (Alternating Current) for use by electrical appliances. This conversion is done by a piece of equipment known as an Inverter.

Commercial PV installations or Solar Farms can be made up of hundreds, or thousands even, of PV modules. A domestic PV system produces approximately 1kW for every four panels installed. If the panels are generating only 70% of the power that your home requires, the 30% balance will come from the grid, which is where your electricity comes into your home through your connection provided by the ESB. If you decide to install a solar PV system you will not only boost your own green credentials, but also those of the nation as a whole. Every solar install on this island will be contributing to Ireland meeting its targets for reduced carbon emissions. In addition to helping the Nation lessen its carbon footprint, an install will mean for you not only an increased BER rating but more importantly an auto-generated supply of free electricity * for the lifetime of the system