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What is a solar power system and how do they work?

A solar power system enables you to take advantage of the free and environmentally sustainable energy provided by the sun. The system features a number of photovoltaic modules (solar panels) that convert radiation from the sun into electricity. Solar panels have no moving parts and can be fixed easily to any homes roof.

Solar panels produce direct (DC) electricity which is transformed into 240V alternating current (AC) electricity by an inverter. The inverter then enables the supply of electricity to run standard residential electrical equipment and also matches the solar generated electricity to the grid power supply.

Electricity produced by a grid-connected solar power system will first be used to run equipment in the home, and any excess output will be exported into the electricity grid. When there is no output from the solar power system (for example, at night) electricity is imported from the grid to run electrical equipment in the home.

Your meter will show how much electricity has been exported to the grid and how much electricity has been imported from the grid, with the difference being your electricity consumption.

A 1.5kW system located in Perth is capable of producing an average of around 7.5k - 9Wh of electricity per day. A 1.5kW solar power system will typically meet around one half all of your electricity.

These are typical scenarios and the production and consumption of electricity will vary depending upon location, installation, lifestyle and other variables.

How will a solar power system save me money?

As stated above, a 1.5kW system will typically generate between 7.5 – 9kW per day. Average usage of a household on the SWIS grid is 15kW per day. Based on studies conducted by Energetics in 2007, your solar power system will enable you to save around $462 or 50 percent of your electricity costs per year at today’s domestic tariff. Domestic tariffs are generally on the A1 tariff of $0.1761 per unit (9kW per day X 365 X $0.1761 X 80% = $462 including GST saving per year on average). This $462 takes into account a 20% loss, which may or may not happen dependant on a number of circumstances.

With the price of electricity set to sky rocket (tariff will be approximately 30.15 cents in 2011/12) the savings afforded by having a 1.5kW PV Solar System installed equates to a saving of $792 per year in 2012.

Plus you secure a $13,000 (RRP) asset, which adds considerably to the value of your home.

These are typical scenarios and the production and consumption of electricity will vary depending upon location, installation, lifestyle and other variables.

http://www.soe.wa.gov.au/report/human-settlements/energy-use-in-settlements.html

How will I be benefitting the environment?

You can stand proud knowing that your solar system is saving 1.8 tonnes of CO² per year from being emitted into the atmosphere. If every new home builder were to make the same choice, there would be an annual CO² reduction in WA equivalent to the removal of 5,000 cars from our roads.

What is the mandatory disclosure of house ratings and how will it effect me?

The Government is introducing mandatory disclosure of residential building energy, greenhouse and water performance at the time of sale or lease, commencing with energy efficiency in May 2011. Having a PV solar energy system installed with significantly increase your homes rating.

You can read the full media release here.

The photovoltaic cells come with a 25 year warranty.