Photovoltaic electricity - generating electricity from sunlight is one of the most environmental friendly ways of obtaining energy. A household solar energy plant, normally known as Off-Grid  need only four componets.

Solar Module
This is the heart of all Photovoltaic  (PV) electricity. Sunlight falls on the
Panel and is convented  into a  DC power.

Solar Battery
The energy which  produced is stored in the batteries for use by  consumers.

Solar Controller
The controller controls the charging procedure

Solar Inverter
Inverter which converts direct current from the solar cells to alternating current.

One 50 Wp PV module is enough to power four or five small fluorescent bulbs, a radio, and a 15-inch black-and-white television set for up to 5 hours a day. Obviously this is only a modest amount of energy, however this represents an important quality of life improvement for many rural people without electricity. A small PV solar home system can cost as little as $550 to $650. This represents a significant monetary investment for a rural campesino in Mexico and several months' worth of income. The need for financing and innovative financing instruments that can assist rural people to obtain better services through the private marketplace is obvious.