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About Photovoltaic / Grid-Tie System
Grid - connected PV Power System
Grid-Connected PV system — A solar system that is tied in to the utility's network. When generating more power than necessary, the system supplies the surplus to the grid. At night, the system draws power from the grid. In effect, the grid acts as an energy storage system, which means the PV system does not need to include battery storage. "Grid-connected" systems - those systems that use an inverter to connect to the utility grid instead of relying on batteries - now make up the largest part of the market.

Source: http://www.sunpowercorp.com/glossary/

Application
  The first PV system applications developed were applied as an energy source for satellites and later for orbital stations in space. Nowadays, photovoltaic systems are applied as an energy source in many cases. Most commonly applied photovoltaic systems can be found in remote and rural areas where no public grid is available. However, quite often grid-connected systems are constructed in urban areas. Photovoltaic systems are an excellent solution to electricity production regardless of your whereabouts - even at high latitudes of Himalayas or in Antarctica photovoltaic systems have been built.

Source: http://www.pvresources.com/en/application.php

Main Components
Photovoltaic Modules
Inverter
GLC
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