Not financial advice. The Cheaper Home Batteries rate is published by the Clean Energy Regulator but can be amended by Parliament. Battery hardware prices are forecast not guarantee. The post assumes you already have rooftop solar and are deciding whether to add a battery; the math for buying solar and battery together is different and outside the scope here.
The short answer
The standard advice for someone considering a home battery in 2026 is “wait for prices to fall.” That advice ignores the federal Cheaper Home Batteries (CHB) rebate schedule. The rate steps down every six months from January 2027 onward, dropping from about $2,691 on a 10 kWh battery installed today to $2,067 in the second half of 2027, $1,638 in late 2028, and continuing down until the scheme closes in December 2030 at about $819. The rebate falls faster than any plausible battery hardware price decline, and waiting also means you give up six to twenty- four months of avoided electricity bills. For a Sydney 4-bed adding a 10 kWh battery to existing solar, buying now beats waiting twelve months by roughly $2,000 in combined upfront and avoided-bill terms. For SA where the retail-feed-in spread is widest, buying now wins by $2,500. For VIC, where household load caps the battery’s self-consumption uplift, the gap is smaller but still positive at $1,800. The only real case for waiting is cash flow.
Whenever someone in a typical Australian property forum asks “should I add a battery to my solar?” the top three replies are some variation of “wait, batteries are getting cheaper.” The reply is well-meant but ignores the actual timing trade. The federal Cheaper Home Batteries (CHB) rebate has a published step-down schedule. It drops on a fixed cadence regardless of what battery hardware prices do. And while you wait, your existing solar keeps exporting at near-zero feed-in tariff that you could have been self-consuming at the retail rate instead.
I ran every state through the battery rebate calculator. Here is what the timing maths actually says.
What the CHB schedule does
The Cheaper Home Batteries program provides a discount at the point of sale, claimed by your CER-accredited installer in the form of small-scale technology certificates (STCs). The rate is published by the regulator and is currently scheduled to step down every six months from 1 January 2027 onward, until the scheme closes on 31 December 2030. The schedule, expressed in dollars for a 10 kWh battery at the current $39 STC market price:
| Install date | STC rate | Rebate on 10 kWh |
|---|---|---|
| May to Dec 2026 (now) | 6.99 STC/kWh | $2,691 |
| Jan to Jun 2027 | 5.86 STC/kWh | $2,262 |
| Jul to Dec 2027 | 5.35 STC/kWh | $2,067 |
| Jan to Jun 2028 | 4.73 STC/kWh | $1,872 |
| Jul to Dec 2028 | 4.21 STC/kWh | $1,638 |
| Jul to Dec 2029 | 3.19 STC/kWh | $1,209 |
| Jul to Dec 2030 (scheme close) | 2.16 STC/kWh | $819 |
CHB STC rate schedule as published by the Clean Energy Regulator (CER March 2026 update). STC price is the live market value, $39 as of June 2026. Dollar amounts are the discount the installer applies at quote time; you do not receive a separate rebate cheque.
Waiting twelve months means about $624 less rebate. Waiting two years means about $1,053 less. By the time the scheme closes in late 2030, the rebate has shrunk by about $1,870 versus today.
The other side of the trade: avoided bills
Every month you delay, your existing solar keeps producing energy you are mostly exporting at the feed-in tariff (3 to 6 cents depending on state) instead of self-consuming at the retail rate (27 to 43 cents). A battery shifts that gap into your bill by soaking up daytime excess and discharging it through the evening peak. For a 4-bedroom Australian household with existing 6.6 kW of solar, adding a 10 kWh battery lifts annual savings by:
- About $1,419 a year in Sydney (retail 36c, FiT 5c).
- About $1,879 a year in Adelaide (retail 43c, FiT 6c).
- About $1,218 a year in Melbourne (retail 29c, FiT 3.3c).
Those are calculator outputs for a 4-bedroom household with existing solar, adding a battery to a no-other-changes baseline. The SA case wins because the retail rate is the highest in the country and the spread between retail and feed-in is the biggest. VIC trails because the household electricity load is lower (lots of VIC homes still use gas for heating and hot water), which caps how much of the solar production the battery can absorb at retail rate.
The cost of waiting, on the same table
The full cost of waiting is the rebate you give up plus the avoided bills you give up. For a 10 kWh battery added to existing solar, the net cost of waiting (in real upfront-dollar terms) looks like this:
| Wait | Rebate lost | Sydney bills lost | SA | VIC |
|---|---|---|---|---|
| 6 months | ~$429 | ~$710 (total ~$1,140) | ~$940 (total ~$1,370) | ~$610 (total ~$1,040) |
| 12 months | ~$624 | ~$1,420 (total ~$2,040) | ~$1,880 (total ~$2,500) | ~$1,220 (total ~$1,840) |
| 24 months | ~$1,053 | ~$2,840 (total ~$3,890) | ~$3,760 (total ~$4,810) | ~$2,440 (total ~$3,490) |
Buying now wins in every state at every horizon. The thesis is not even close. Even VIC, where the household load is smallest and the battery uplift is most modest, the twelve-month wait costs nearly $1,800 in combined upfront and bills.
But surely batteries are getting cheaper too?
This is the sceptical reader’s objection and it is reasonable. Battery hardware prices have been falling. Globally LFP cell costs have dropped roughly 5 to 8 percent a year in real terms. So if you wait twelve months, your rebate shrinks but your battery is also slightly cheaper. Does that close the gap?
Run it. A 10 kWh battery installed today is about $11,000 gross. At 5 percent nominal hardware decline (which is roughly what Australian installer surveys actually show, blending in inverter and labour cost stickiness), the same battery in mid-2027 is about $10,450 gross. After the smaller mid-2027 rebate, you net out about $74 worse than buying today. At 10 percent decline, you net about $476 better on the upfront. But you still lost 12 months of bill savings ($1,419 in Sydney, $1,879 in SA, $1,218 in VIC).
The break-even for the thesis to flip in VIC (where the bill side is smallest) is around 15 percent nominal annual hardware decline. In SA and NSW the breakeven is above 20 percent. Residential battery hardware has never declined that fast in Australia. Even the most aggressive industry forecasts top out around 10 percent.
The maths is robust because the CHB schedule front-loads the decline. The biggest single step is the January 2027 cut, which takes out roughly $429 of rebate value overnight. A 5 percent hardware price drop over the same six months is about $275 in real terms. You lose more in the rebate step than you gain from prices.
When waiting actually makes sense
Three real cases where waiting beats buying:
- Cash flow. If you cannot afford the net cost today and getting finance is expensive, waiting until you can pay cash beats paying interest. Run a separate calculation against your finance rate.
- Selling the house inside five years. A battery pays back over six to eight years on a typical install. If you are planning to move before then, the unrecovered capex matters more than the rebate step-down. Battery resale value is poorly priced into property markets and you may not recover it.
- Installation friction. If your switchboard needs upgrading, your house needs rewiring, or your battery choice depends on a new EV charger you have not yet bought, the install cost is dominated by those one-off items rather than by the battery itself. The CHB rebate is a smaller part of the maths and the urgency softens.
None of these are about the rebate schedule. They are about your specific situation. The schedule itself is unambiguous: it drops and never recovers.
The six-week action checklist
If the maths above suggests buying now, the practical timing is:
- This week: request quotes from at least two CER-accredited battery installers. The CHB rebate must be claimed by an accredited installer at point of sale; you cannot buy a battery on Marketplace and claim it yourself. Quote packages should explicitly state the STC discount applied.
- Weeks 2 to 4: choose the system size. For typical existing-solar households a 10 to 13 kWh battery covers the evening peak comfortably. Bigger batteries do not pay back proportionally because the marginal kWh after the first 13 is storing peak excess that often exports the next morning.
- Weeks 4 to 6: install. Winter is the slower part of the residential install calendar, so lead times are shorter than spring or summer. Most installers can complete within 4 to 6 weeks of deposit at this time of year.
A few caveats worth knowing
The CHB rebate must be claimed by a CER-accredited installer at point of sale. You cannot buy a battery on Marketplace or import it and claim the rebate retrospectively. Get quotes from accredited providers and check the discount is itemised.
STC certificate market prices fluctuate. The $39 used in the table is the typical clearing-house price as of June 2026; the actual discount your installer applies tracks that price minus their handling spread. Reasonable accredited installers pass through 90 to 95 percent of the market value.
The schedule is published and can be amended by Parliament. There is no indication of planned amendments as of June 2026, but policy can change.
The post assumes you already have solar. A no-solar household installing solar and battery together has a different decision shape, because the solar saves real money from day one and the timing question is dominated by solar economics rather than the CHB schedule. The combo case is a separate post.
Run your own numbers
The figures above are for a typical 4-bedroom Australian household with existing 6.6 kW solar. Your numbers will move with your actual solar size, your usage shape, your retail tariff, and whether you have time-of-use enabled. The calculator works out the exact battery payback and CHB rebate for your postcode and household.
Where these numbers come from
CHB STC rate schedule from the Clean Energy Regulator’s March 2026 published schedule. STC price from the clearing-house current spot. Retail electricity rates and feed-in tariffs from Canstar and AER 2025-26 averages. Battery install costs from SolarChoice and installer surveys 2026 H1. Battery self-consumption fractions (~30% without battery, ~70% with) from CSIRO and Solar Analytics field studies. Full data source list on the data sources page.