Solar PV (photovoltaic) systems generate electricity when sunlight falls on solar panels which are normally made of crystalline silicon and mounted on the roof of the home or other building. Although a great deal of energy is consumed in the manufacture of PV systems, one installed they should continue to produce virtually free electricity for up to 20 years. - Description added by: www.microchap.info

Appliances, whether domestic, commercial or industrial, are consumers of electricity. A low carbon economy requires that these appliances be very energy efficient, both in use and when on standby. However, there are embedded carbon costs in appliances, from their manufacture and transport. These also needs to be considered when choosing an appliance. - Description added by: David Lockie