Many homes select a 3kW solar system, which would require twelve x 250 watt solar panels. More or less panels will probably be required according to their personal output. Bear in mind, your solar installer should take into account products based upon your individual circumstances, and quotation you a price https://citypointsolar.com.au/act-pensioner-rebates-for-solar-to-help-ditch-gas-how-to-apply/