Solar cells are composed of two sheets of silicon, compressed together that absorb photons (light) from the sun. When light is absorbed onto the module’s surface, an electric field is produced that generates direct current (DC) and power. This current is transmitted to an inverter, which converts the DC current into alternate current (AC), and is then fed into your electric panel. From there, electricity can be used to supply power directly to electrical fixtures and equipment, and if not needed, can be sold back to the electric utility.
Solar Heating works on the principle of heat transfer. Solar vacuum tubes are exposed to the sun and contain a hollow copper heat pipe that is inserted into a vacuum. The inside of the pipe contains a small amount of water, and will boil at very low temperatures, due to the effects of the vacuum. The hot vapour rises, and the heat from the vapour is transferred to the manifold in contact with it. From there, the hot liquid in the manifold is transferred to a water storage tank or heat exchanger, which can be used for domestic hot water or building heating applications.