Since 1 May 2026, battery rebate support in Australia is tiered by size. Understanding the tiers is the difference between a well-priced system and paying for capacity the rebate barely supports.
| Capacity band | Support level | What it means |
|---|---|---|
| 0 – 14 kWh | 100% | Full rebate rate on every kWh |
| 14 – 28 kWh | 60% | Reduced rate on this portion |
| Above 28 kWh | Minimal | Little to no support on this portion |
A 10–14kWh battery gets every kilowatt-hour supported at the full rate, covers the evening peak for most Sydney households, and hits the best cost-per-kWh after rebates. Doubling capacity does not double the rebate.
In those cases, ask installers to quote both a 14kWh option and your larger option with the rebate itemised on each — the comparison usually decides it. Start with the rebate calculator.