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Everything you require to know before you buy a 9.9 kW Solar System
A 9.9kW system with a 9.9kW inverter will typically generate enough solar to meet the electricity needs of the Australian household. Production varies depending on where you live; a 9.9kW system in Melbourne produces 40kWh per day, whereas in Brisbane produces 35kWh per day.
The table below shows how much energy a 9.9kW solar panel system generates in major Australian cities:
| Adelaide | 36kWh |
| Brisbane | 35kWh |
| Melbourne | 40kWh |
| Perth | 39kWh |
| Sydney | 33kWh |
The average payback period for 9.9kW solar panels is estimated to be 2.5 to 5 years. This is a fairly broad range because many factors will influence how long it will take to pay off your panels and how much money you will save each month.
If you use a lot of energy, a 9.9kW with batteries might be a good option for you. A 9.9kW system with a battery storage capacity of 9.9kWh will cost between $16,000 and $22,000.
As a starting point, For a 9.9kW solar system with 27 panels (370w) and a panel size of approximately 1.8 metres by 1 metre, you will need at least 65 square metres of roof space. While 23 panels (440w) require 60 square metres of roof space.
Solar rebate is depends on size of your solar system and your property location. Let calculate solar rebate for 9.9kW solar system using following formula:
Total Solar Array Combined Wattage x 1.382 x the current STC multiplier of 10-years / 1000
The calculation would be: 9990 x 1.382 x 10 / 1000 = 138 no of STC
138 STCs are eligible for 9.9kW solar system. Now multiply the number of STCs by market value of each STCs. So, 138 STCs x $38 = $5244 Solar panel rebate you will have.
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