A great video explaining Solar Energy.
Photovoltaic(PV) systems are used to generate electricity through PV solar panels installed on the best lit surface of the premises. Each panel is an electrical device built up of solar cells converting light energy directly into electricity to power lights and appliances. The system can either be connected directly into the electrical mains power grid(Grid-Tied) or may be used to power a battery bank(Off-Grid). Grid- Tied systems have a lower initial expense in comparison to battery operated systems. An average Grid-Tied PV system varies in price, ranging from R12 300 to R170 000 for a 250W and 6000W system respectively and have a 5 to 6 year return on investment. These systems carry a 25 year warrantee.