Why Solar Electricity?

By the time you have reached this page, you are already convinced by the viability of solar power. However, here are some additional points you may like to consider:

Some reasons to Go Solar

“SOLAR IS OUR OLDEST AND NEWEST FORM OF ENERGY”
Protect Yourself from Rising Electricity Cost
Electricity gets more expensive every year. Over the last 2 years, the average annual rate increase has been 15 to 20%. High energy users have seen substantially greater increases.
Support Clean Energy—Environmental Benefits
The average solar PV residential system (based on 5kW), would save nearly 175 tons of carbon dioxide over its 30-year life span, equivalent to removing 32 cars from the road. It takes approximately 4,487 new trees to absorb that much CO2 produced by fossil fuels.
Add Value to Your Home
The value of a solar system is added to the appraised value of your property and does not increase your property taxes. Solar is one of the few home improvements that can be justified in terms of return on invested dollar.
Unlimited Free Energy Source Provided by the Sun
Do your part to help the energy crisis. Solar is a true renewable and sustainable source of energy. Reduce the dependency on fossil fuels and produce your own electricity while reducing your carbon footprint.
Government Rebate is still available
With current financial incentives available from the Federal government to encourage investment in solar energy. There has never been a better time taking advantage of Government grants and getting some of your taxed money back and putting it into your home that can save you money every day.

During daylight

The direct current electricity (DC) from the solar array is converted to alternating current (AC) by a smart electronic inverter. The power is then instantaneously fed directly into the building electrical system where it is used up saving electricity. Any excess solar power is exported to the utility power grid and any shortfall is made up with electricity supplied by the grid.

At night

Your smart inverter automatically disconnects from the grid when there is no sufficient daylight (Lux) for the solar array to maintain the required voltage to generate electricity. At night, your electricity need is supplied by the supply authority such as Energy Australia and Integral Energy in Sydney.

Structure of Solar Cell Converts Sunlight into Electricity

  • Solar cells are manufactured by joining two types of semi conducting material: P-type and N-type. P-type semiconductors contain negative ions, and N-type semiconductors contain positive ions. The migration of positive and negative ions from one layer type to another cause an electrical current to flow in the solar cell.
  • Photoelectric effect was explained by Albert Einstein that radiation itself consists of packets of energy now called photons. Einstein showed that not only is light quantized, but so are atomic vibrations.
  • A solar cell consists of a glass cover to seal the cell from the environment, an anti-reflective layer to maximize incoming sunlight. The electric current generated by sunlight is collected on the electrodes and the circuit is completed when an electric load is connected across the open circuit electrodes.

Photovoltaic Modules and Systems

A photovoltaic module is made up of several Solar cells to provide a usable voltage and current when solar cells are arranged in series and parallel. The term “module” is often used interchangeably with the term “panel”. A single solar cell alone cannot produce usable power.

PV systems can either be stand-alone, or grid-connected. The main difference between these two basic types of systems is that in the latter case, the PV system produces power which is fed back into the grid when there is surplus power.

Grid-connected PV Solar Electricity Systems


Grid connected Solar system is when PV system is connected via an inverter (DC to AC) to the grid. Provided that sufficient panels are used to generate electricity from the sun, the appliances in the house/building will then run on solar electricity. A grid-connected solar electricity system consists of:

  • designed system of solar panels,
  • an inverter to convert DC voltage to mains supply of 240V AC,
  • cables, circuit breakers, the electric load and a support structure to mount the solar panels.

The solar panels can be mounted on the roof under the optimum tilt angle with a support structure or aluminium frame. Although a handy person can do some of the work, all electric connections must be carried out by a qualified and accredited licensed electrician to enable you to claim the rebate.

Inverter

Converts the DC output of the PV array into mains 240VAC single phase output that can be fed directly into the electricity network where a smart or analogue meter will log the kWh of electricity generated by your solar array.

What happens when there is a blackout?

For safety reasons, when your electricity supply from the grid is interrupted during daylight, the inverter senses that change and automatically disconnects from the mains supply. It is possible to have a system that will provide emergency electricity when the grid goes down during the day, with the use of a suitable inverter and battery bank or other switchover arrangements. Any switchover arrangement must meet Australian Standards and be done by qualified and certified electrical contractor.

Stand-alone Power Systems

Stand-alone Power Systems (SPS) or widely known as Remote Area Power Systems (RAPS) are used when no electricity grid is available. The system consists of:

  • solar panels
  • control unit
  • battery bank
  • backup generator – diesel or LPG driven
  • cabling, support structure and the electric load

Roof Mounting Structure

Roof mounts and module fixtures are used to secure the PV modules in place on all types of roofs. Depending on the application, the PV modules can be mounted on rooftops, in farms, factory and warehouse roofs.