Find out what your home actually needs
The worked example
| Component | Assumption | STCs | Value |
|---|---|---|---|
| Solar STCs | 13.3 kW system, STC Zone 3, 5-year deeming (2026 install) | 91 | $3,458 |
| Battery STCs | 14 kWh usable, STC factor 6.8 (from 1 May 2026), full rate applies to the first 14 kWh | 95 | $3,610 |
| Total | 186 | $7,068 |
STC price assumed at $38. Installers typically pass on slightly less than the spot price to cover administration. Zone 3 covers Sydney, Brisbane, Perth, Adelaide and Canberra. Melbourne and Hobart are Zone 4, where the same system attracts $6,574.
Find out what your home actually needs
Free, takes 60 seconds, no obligation.
Over 3.6 million homes already claiming rebates
What it does not include
- State schemes (listed separately on each state page because eligibility varies)
- Interest-free loans
- Feed-in tariffs
- VPP payments
- Anything means-tested or concession-only
Why 13.3 kW and 14 kWh
14 kWh is the point where the federal battery rebate stops paying full rate. From 14 to 28 kWh it pays 60%, and from 28 to 50 kWh it pays 15%. It is also the size range a good installer recommends for most households after May 2026. We size to your usage, not to the biggest number we can print, so the headline uses the system most people should actually buy.
13.3 kW is the largest array a standard single-phase home can install: a 10 kW inverter with the 133% panel oversize the STC rules allow. Three-phase homes can install more and earn more certificates, but most Australian homes are single-phase.
Other common systems (Zone 3 / Zone 4)
| System | Zone 3 | Zone 4 |
|---|---|---|
| 6.6 kW + 10 kWh | $4,294 | $4,066 |
| 10 kW + 10 kWh | $5,206 | $4,826 |
| 13.3 kW + 14 kWh | $7,068 | $6,574 |
| 13.3 kW + 20 kWh60% rate applies above 14 kWh | $7,980 | $7,486 |
See your specific solar savings
Based on your postcode, energy use and roof.
Over 3.6 million homes already claiming rebates
When the number changes
On 1 January 2027 the solar deeming period drops from 5 years to 4, cutting the solar component by about 20%. The battery STC factor also steps down in January and July each year. The STC spot price moves with the market. We review this page monthly and note the date of the last review below.
State add-ons
- Western Australia: up to $1,300 (Synergy) or $3,800 (Horizon Power) from the WA Residential Battery Scheme, stackable with the federal rebate.
- Victoria: $1,400 on panels through Solar Victoria for eligible households. The battery loan program has closed.
- Australian Capital Territory: up to $5,000 through HESP for concession card holders, plus Sustainable Household Scheme loans.
- South Australia: VPP incentives. The SA Home Battery Scheme has closed.
- New South Wales: VPP incentives under the Peak Demand Reduction Scheme, plus a $15,000 interest-free Home Energy Saver loan. No upfront battery discount.
- Queensland: no state add-on. Queensland is in the highest STC zone for most of the state.
- Northern Territory: no state add-on. The Home and Business Battery Scheme is closed.
- Tasmania: no state add-on.
Last reviewed: 2 September 2026.
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The next step
If you have any questions about the information in this guide, feel free to get in touch:
Email: andy@whysolar.com.au
Tel: +61 2 5657 6527
If you're considering solar panels or batteries for your home, Andy and the team can help you get quotes from trusted, pre-vetted local installers:
Written by
Andy McMasterSolar Installer Partner Relations
Connects homeowners with trusted, vetted solar installers across Australia. Andy works directly with installation companies to ensure quality standards and helps homeowners navigate the quoting process.
Learn more about Andy McMaster