The power generated by using the PV template set on the roof to convert solar energy into electrical energy, which has no emissions of exhaust, and does not produce pollution or noise, is a convenient and environmentally energy.

The output electric of solar cells is direct current (DC), but the most common household appliances use alternating current (AC), so it needs DC / AC power converter (inverter) to convert DC into AC, which will be supplied for general electrical appliance, such as: lighting system, television, refrigerator, air-conditioners, etc.

Solar cells only generate electricity when exposed to sunlight, so when the light is too weak such as at night or rainy days, the photovoltaic system can not generate electricity or the supply of electricity is weak, then the commercial power is used.
When the residential power consumption is quite less in the day-time, the redundant electric can be distributed to other regions needed electricity or sold to power companies through the power network.