Free calculation tool
Get an instant, indicative estimate of your recommended solar and battery system size, estimated annual power bill savings, and estimated payback period in Greater Sydney.
This calculator provides an indicative estimate only, based on typical Sydney sun hours and average electricity rates. Your final recommendation may vary based on a full site assessment.
8.3 kW
Recommended system size
14.850000000000001 kWh
Suggested battery size
$3,167
Estimated annual savings
6.9 yrs
Estimated payback period
This calculator models Sydney's average solar irradiance (approx. 4.2 peak sun hours daily), current New South Wales retail electricity tariffs (32c–38c/kWh grid import), and solar feed-in tariffs (5c–8c/kWh export). While actual savings vary with roof orientation, shading, and season, it provides a realistic indicative estimate based on real local data.
Most NSW energy retailers currently offer between 5c and 8c per kilowatt-hour for exported solar electricity. Because retail electricity purchased from the grid costs 30c–40c/kWh, your greatest financial savings come from consuming your own solar energy during the day or storing it in a battery for evening use.
The NSW PDRS incentive provides an upfront discount of up to $1,600 to $2,400 on approved home batteries. By reducing the net capital cost, the rebate typically compresses battery payback periods down from 9–11 years to just 6–8 years.
A 6.6kW system is ideal for small to medium households with quarterly power bills around $400–$700. If your quarterly bill exceeds $800, or you run ducted air conditioning, have a pool pump, or intend to charge an electric vehicle (EV), a 10kW to 13.3kW system provides significantly higher bill offset and future capacity.
