ELECTRICITY FROM PHOTOVOLTAIC SYSTEM

I Basic Principle of Technology. Photovoltaic (PV) cell or Solar cell, as an electronic invention made of semi conductor, it converts sunlight directly into electricity as for a direct current.

Solar cell is a power generating equipment requires no fuels except for daylight from free solar energy, emits no pollution. PV equipment and system has no moving parts thus results in no wear and tear problem or in maintenance as required by other power generation systems, such as diesel power generation. Additionally, the lightweight of solar cell makes the best of a rated power output per weight.

1. The PV power system on the house roof consists of a panel of PV array mounting on the roof and inverter The principle of system operation is as follows :When the solar cells in PV panel mounted on the roof are exposed to sunlight, electrical charges are generated, and all solar cells will generate DC (Direct Current) electricity passing a control system to inverter.
2. An Inverter will convert the DC to AC electricity and then supply to the power system of a house.
3. During the time of insufficient radiation intensity or using of appliances at higher wattage than the watts generated from solar cells, the system will be compensated by the PEA grid power supply to operate the electrical appliances.

Applications. Electricity generation from the rooftop PV system is suitable for the house owner who wishes to ultilise the renewable power generation in supplement alternatively with the lo¬cal power grid system from electricity ultility.

Benefits of Technology

1. Savings on electricity bills
2. Reducing environmental impacts causing from other power generating systems, ex: power generation from diesel, fuel oil or coal, which are all polluted to natural environment
3. Promoting and building up awareness on the clean technology, acknowledging the electrical power generated to co-operate using an electricity efficiently and saving.

Application Considerations. House Structure: House to be mounted with PV array on its roof must be strong and large enough to support the weight and size of the PV array