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Battery Rebate Calculator: STCs by Battery Size and Installation Date
Work out the STCs and dollar value of the Cheaper Home Batteries Program discount from usable capacity and installation date, plus solar STCs if you install new panels too.
STCs by size and date
| Usable capacity | Nov–Dec 2026 | Jan–Jun 2027 | Jul–Dec 2027 | Jan–Jun 2028 | Jul–Dec 2028 | Jan–Jun 2029 | Jul–Dec 2029 | Jan–Jun 2030 | Jul–Dec 2030 |
|---|---|---|---|---|---|---|---|---|---|
| 5 kWh | 34 | 28 | 26 | 23 | 20 | 18 | 15 | 13 | 10 |
| 8 kWh | 54 | 45 | 41 | 36 | 32 | 28 | 24 | 20 | 16 |
| 10 kWh | 68 | 57 | 52 | 46 | 41 | 36 | 31 | 26 | 21 |
| 13.5 kWh | 91 | 76 | 70 | 62 | 55 | 48 | 41 | 35 | 28 |
| 16 kWh | 103 | 86 | 79 | 69 | 62 | 54 | 47 | 39 | 31 |
| 20 kWh | 119 | 100 | 91 | 80 | 72 | 63 | 54 | 45 | 36 |
| 25 kWh | 140 | 117 | 107 | 94 | 84 | 74 | 63 | 53 | 43 |
| 30 kWh | 154 | 129 | 118 | 104 | 93 | 81 | 70 | 59 | 47 |
| 40 kWh | 164 | 137 | 125 | 111 | 99 | 87 | 75 | 62 | 50 |
Multiply by the STC price (e.g. $38) for dollars.
Formula
- Battery STCs = eligible capacity × STC factor (rounded down).
- Eligible capacity (from May 2026): 0–14 kWh at 100%, 14–28 kWh at 60%, 28–50 kWh at 15%. Nothing above 50 kWh.
- Solar STCs = kW × zone rating (zones 1–4: 1.622, 1.536, 1.382, 1.185) × deeming years (5 in 2026, 4 in 2027).
Figures on this site are estimates from Clean Energy Regulator rules, NASA climate data and assumed prices. They are not quotes and the rebate is not guaranteed. The rebate (STCs) is created by your installer and passed on as a discount; its value depends on the number of STCs and the STC price at the time. Get quotes from several installers and check your retailer's tariffs and official federal and state information before buying.
Sources: battery STC factors, size tiers, solar zones and deeming periods from the Clean Energy Regulator; postcode zones from the CER table (as of 1 January 2020); solar radiation and temperature from NASA POWER (2001–2025 monthly climatology). Calculated by this site (checked 2026-11-01).