Thursday, June 30, 2011
11:17 AM | Posted by
Editor in chief |
The photovoltaic (sometimes called “voltaic” for short) type of solar power plant converts the sun’s energy directly into electrical energy. A photovoltaic array is shown in above figure. This type of production uses various types of films or special materials that convert sunlight into direct current (DC) electrical energy systems.
Panels are then connected in series and parallel to obtain the desired output voltage and current ratings. Some systems use an energy storage device (i.e., battery) to provide electrical power during offsun- peak periods. This dc energy is converted to utility ac energy by means of a device called an inverter.
Larger-scale voltaic solar power systems are typically made of 1.5 Vdc solar cells capable of producing approximately 20 ma of electrical current each. A typical solar photovoltaic panel measuring 4 feet by 1 foot would produce approximately 50–60 watts of electrical power. Therefore, a 4 foot panel would supply power for a 60 watt lightbulb during daylight hours.
Given today’s technology and the space that is needed, direct solar voltaic systems are not practical for large-scale electric power production.
Solar plants are environmentally friendly as they produce no pollution. The main drawback to these plants is the cost of the panels and conversion equipment. Technology has produced more efficient panels at lower cost,
and direct solar systems will eventually be more cost-effective. They are currently used commercially to power small devices in remote areas. There remain several tax incentives to promote use of solar power by residential and small business consumers.
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