When you ask for a home battery quote in Australia in 2026, almost every advertised price already has the federal Cheaper Home Batteries Program discount deducted. That makes a 10–13.5 kWh battery roughly $2,700 to $3,600 cheaper upfront than it was before July 2025 — but it also makes quotes tricky to compare unless you separate the gross installed price, the federal STC discount, and whether an inverter is included.
Below are the latest published Australian installed price benchmarks as of October 2026, along with the exact federal discount maths for installations between 1 May and 31 December 2026 (STC factor 6.8, spot price $39.65/STC).
Test whether those numbers actually pay back on your electricity bill and feed-in tariff.
Average installed home battery prices by size (10 kWh to 50 kWh)
The benchmark figures below come from the Solar Choice Australian Battery Price Index (August 2026 installer network dataset, updated 16 September 2026), which averages live pricing from over 100 Australian solar and battery installation companies. Published index prices include standard installation, GST, and the federal battery discount.
To show the complete picture, we have also calculated the 2026 federal STC discount (at 6.8 STCs/kWh with the 14/28/50 kWh taper and $39.65/STC) so you can see the implied pre-rebate system price:
| Usable capacity | 2026 federal discount (STCs @ $39.65) | Net installed: Battery only* | Net installed: Battery + inverter** | Net cost per usable kWh |
|---|---|---|---|---|
| 5 kWh (indicative) | −$1,348 (34 STCs) | ~$5,325 | ~$7,425 | $1,065–$1,485/kWh |
| 10 kWhBenchmark | −$2,696 (68 STCs) | $7,784 | $8,284 | $778–$828/kWh |
| 20 kWh | −$4,718 (119 STCs) | $14,972 | $15,772 | $749–$789/kWh |
| 30 kWh | −$6,106 (154 STCs) | $22,489 | $23,089 | $750–$770/kWh |
| 40 kWh | −$6,503 (164 STCs) | $29,911 | $31,111 | $748–$778/kWh |
| 50 kWh | −$6,899 (174 STCs) | $38,534 | $40,034 | $771–$801/kWh |
*Battery only assumes you already have a compatible hybrid/battery-ready solar inverter or are installing solar panels and a hybrid inverter at the same time.
**Battery + inverter includes an additional inverter/charger so the battery can be AC-coupled to any existing solar system. Source: Solar Choice Battery Price Index (updated 16 Sept 2026); 5 kWh row from Solar Choice 2026 system cost guide.
Home battery prices by brand in Australia (2026)
Brand choice is the next biggest driver of what you pay. In Australia's 2026 market, LFP (lithium iron phosphate) chemistry is standard across all major brands, and pricing falls into three clear tiers:
- Value modular DC batteries (FoxESS, AlphaESS, GoodWe, Sungrow): Lowest upfront cost per kWh ($500–$950/kWh after rebate), especially when paired with the same brand's hybrid inverter.
- Mid-to-premium modular systems (BYD Battery-Box HVM, Sigenergy SigenStor): Strong inverter compatibility (BYD pairs with Fronius, SMA and GoodWe) or all-in-one EV/whole-home integration (Sigenergy).
- All-in-one premium & microinverter batteries (Tesla Powerwall 3, Enphase IQ Battery): Higher upfront price ($11,500–$13,600+ after rebate for Powerwall 3), but Tesla includes an integrated 11.04 kW inverter and whole-home backup gateway, while Enphase offers a 15-year warranty.
The table below compiles published 2026 Australian installed price ranges across Solar Choice (August/September 2026 index) and Why Solar / Solar Power Savings (September–October 2026 installer quote surveys), alongside our exact May–December 2026 federal STC calculation:
| Brand & model | Usable kWh | Gross installed (before rebate) | 2026 federal discount | Net installed (after federal rebate) |
|---|---|---|---|---|
| Tesla Powerwall 3 Built-in inverter + Backup Gateway · 10-yr warranty | 13.5 kWh | $15,000–$17,250 | −$3,608 (91 STCs) | $11,400–$13,640 |
| Sungrow SBR 9.6 / 12.8 HV DC-coupled (needs Sungrow SH hybrid) · 10-yr warranty | 9.6–12.8 kWh | $8,500–$14,800 | −$2,577 to −$3,450 | $5,200–$11,370 |
| BYD Battery-Box Premium HVM DC-coupled (Fronius, SMA, GoodWe) · 10-yr warranty | 13.8 kWh | $11,000–$16,000 | −$3,687 (93 STCs) | $7,460–$12,320 |
| Sigenergy SigenStor All-in-one hybrid + whole-home backup · 10-yr warranty | 15.6–16.0 kWh | $15,970–$17,970 | −$4,005 to −$4,084 | $11,960–$13,960 |
| AlphaESS SMILE (10.1 / 13.3 kWh) All-in-one / hybrid · 10-yr warranty | 10.1–13.3 kWh | $10,350–$14,800 | −$2,736 to −$3,569 | $7,660–$11,250 |
| FoxESS EQ4800 / ECS (~10–14 kWh) DC-coupled (needs FoxESS hybrid) · 10-yr warranty | 10.0–14.0 kWh | $9,500–$11,500 | −$2,696 to −$3,767 | $6,800–$8,300 |
| GoodWe Lynx Home F G2 DC-coupled modular · 10-yr warranty | 12.8–16.0 kWh | $12,020–$14,020 | −$3,450 to −$4,084 | $8,570–$10,570 |
| Enphase IQ Battery (10 kWh / 2×5P) AC-coupled microinverter · 15-yr warranty | 10.0 kWh | $14,000–$15,000 | −$2,696 (68 STCs) | $11,300–$12,300 |
Apples-to-apples warning on inverter costs: A DC-coupled battery like the Sungrow SBR or BYD HVM looks $3,000–$4,000 cheaper than a Tesla Powerwall 3, and it is — if you already own a compatible hybrid inverter. If your existing solar system has a standard string inverter, adding a new hybrid inverter adds roughly $2,000 to $3,000 installed, narrowing the gap with an all-in-one unit like the Powerwall 3.
Why bigger batteries no longer get cheaper per kWh after rebate
Normally, buying a larger battery brings down the per-kWh installation cost because switchboard work, scaffolding and installer call-out fees are spread across more storage. However, since the 1 May 2026 STC taper took effect, the federal subsidy shrinks above 14 kWh:
- From 0 to 14 kWh usable, the federal discount takes off roughly $270 per kWh (6.8 STCs × $39.65).
- From 14 to 28 kWh usable, the discount drops to 60%, taking off roughly $162 per kWh.
- From 28 to 50 kWh usable, the discount drops to 15%, taking off only $40 per kWh.
As Solar Choice notes in its August 2026 Price Index, these two forces cancel each other out: your net out-of-pocket price stays almost flat at around $750 to $800 per usable kWh all the way from 10 kWh to 50 kWh. That means buying capacity you don't use every night hurts your payback. Check our home battery sizing tool before ordering a 20+ kWh stack.
What pushes your battery quote up or down?
Two households ordering the exact same 13.5 kWh battery can see quotes differ by $2,000 to $4,000. Here are the physical site factors that move a quote:
- AC-coupled vs hybrid inverter retrofit. Connecting a DC battery to an existing battery-ready hybrid inverter is the cheapest install. If your existing solar inverter isn't hybrid, you either need an AC-coupled battery (with its own built-in inverter) or a hybrid inverter replacement (+$2,000–$3,000).
- Blackout backup wiring ($800–$2,000). Not all battery installations work during a blackout by default. Wiring essential circuits (or whole-home backup via a gateway/changeover switch) requires extra sub-board and electrician time.
- AS/NZS 5139 location & fire rules ($300–$1,200). Australian Standard AS/NZS 5139 restricts installing batteries near bedrooms, windows, doors and gas meters. Mounting on a combustible wall requires a fire-rated cement sheet backing, and garage installs in vehicle paths require a steel bollard.
- Switchboard upgrades & three-phase ($500–$2,500). Older switchboards with ceramic fuses, asbestos panels, or no space for battery circuit breakers and smart meters must be upgraded to current safety standards. Three-phase backup gateways also cost more than single-phase.
A smarter metric: cost per warrantied kWh
Upfront price per kWh doesn't account for how many years a battery lasts or how much energy it is guaranteed to deliver before its warranty ends. Dividing the net installed price by the manufacturer's warrantied lifetime throughput (in kWh) gives your true storage cost for every kWh cycled through the battery.
In Solar Choice's August 2026 index, the average cost per warrantied kWh is $0.28/kWh for 16–20 kWh batteries, falling to $0.23/kWh for 20–30 kWh systems and $0.20/kWh for 40–50 kWh systems. Compare that figure against the gap between your evening peak electricity rate and your daytime solar feed-in tariff: if your peak rate is 38c/kWh and your feed-in tariff is 4c/kWh, each cycled kWh saves you 34c — putting you ahead of a 23–28c/kWh warrantied storage cost.
Compare specs and warranty terms across all eight models in our best home batteries in Australia (2026) comparison, and run your own tariff and quote numbers in our battery payback calculator and battery rebate calculator.
Sources
CHECKED 24 OCT 2026- Solar Choice: Australian Solar Battery Price Index (August 2026 data, updated 16 September 2026)
- Solar Choice: Solar Battery Costs in Australia 2026 (brand averages & 5–20 kWh system benchmarks)
- Why Solar: Solar Battery Prices Australia 2026 — Cost by Size and Brand (checked 30 Sept 2026)
- Solar Power Savings: Solar battery prices 2026 — cost by kWh, brand and state (checked 10 Oct 2026)
- ABC News: Is the home battery rebate still worth it? ($12,000–$14,000 pre-subsidy benchmark for ~13 kWh batteries)
- Clean Energy Regulator: Solar batteries STC factors and 14/28/50 kWh taper
- Demand Manager: STC open-market spot price ($39.65, 15 Oct 2026)
StoredWatts is independent. Partner commissions never change our calculators or what we write. General information only, not financial advice.