Price per usable kWh, before the rebate
| Source (2026) | Range, installed |
|---|---|
| Sunbridge Energy | $900 to $1,300 for quality systems, from about $700 for budget hardware |
| Why Solar | about $664 to $1,488 across nine models (hybrid inverter extra) |
| Gridly | installation alone adds about $1,500 to $3,500 to the supply price |
What the rebate takes off
At the current certificate factor (6.8) and an assumed certificate price of $38, the federal rebate is worth:
| Usable capacity | Rebate until 31 Dec 2026 | Price after rebate |
|---|---|---|
| 10 kWh | about $2,584 | about $6,400 to $10,400 |
| 13.5 kWh | about $3,458 | about $8,700 to $14,100 |
| 20 kWh | about $4,522 | about $13,500 to $21,500 |
Larger batteries cost less per kWh, but since 1 May 2026 capacity above 14 kWh only earns 60 % of the factor, and capacity above 28 kWh only 15 %. Work out your own figure with the calculator.
What pushes the price up
- A new hybrid inverter if your current solar inverter cannot run a battery.
- Switchboard upgrades, backup circuits, or a difficult install location.
- Premium brands and longer warranties.
Before you sign
Ask each installer to show the usable capacity, the number of certificates and the certificate price used, and the price after the rebate. Get at least two quotes.
Before you get quotes: the 7-point checklist