Choosing the right size system can depend on a few things such as your roof space, energy usage, energy supplier regulations etc. A good place to start is by comparing your energy usage against the chart below:
Assess your electricity bill and confirm how many kilowatts you are using per day
Compare your usage against the chart details for Melbourne
For example if your energy usage is 10kWh, than we would recommend you install a 3.0 kWh system.
The output of a solar PV system depends on its size. The table shows the average daily production of some common grid-connected systems throughout Australia.
The rated output is that achieved in perfect laboratory conditions. The CEC design summary software takes these deratings into account when predicting average for any given system.A typical Australian house consumes around 18 kilowatt hours (kWh) per day so a 1-2kW system displaces an average of 25-40% of your average electricity bill. Solar panels produce more energy in summer than they do in winter.
Data sourced from solar PV consumer guide Volume 21: 19 December 2012