The honest answer to "are home batteries worth it?" is: it depends. The economics vary significantly based on your electricity usage, solar system, tariff, and state. Here's a rigorous look at current numbers — and when they do and don't stack up.
The basic maths
A battery earns its keep by shifting solar energy you'd otherwise export (cheaply) back to the grid into energy you use yourself at night (avoiding expensive imports). The saving per kilowatt-hour cycled is:
Daily saving = (import rate − feed-in tariff) × daily kWh cycled
What are current tariff rates?
As of mid-2026, Australian residential import tariffs vary meaningfully by state:
- South Australia: 36–43 c/kWh (among the highest nationally)
- New South Wales: 28–36 c/kWh
- Victoria: 25–34 c/kWh
- Queensland (SEQ): 24–32 c/kWh
- Western Australia: 30–34 c/kWh
Feed-in tariffs have been falling for years. Typical current rates:
- NSW: 5–7 c/kWh (benchmark 4.8–7.3 c/kWh for 2025–26)
- Victoria: 1–8 c/kWh (regulated minimum removed July 2025; averages around 1–3 c/kWh with many retailers)
- South Australia: 2–5 c/kWh
- Queensland (SEQ): 3–10 c/kWh
- Tasmania: ~8.8 c/kWh
The tariff spread — the gap between what you pay to import and what you earn by exporting — is what drives battery value. In South Australia that gap can reach 38 cents per kWh. In Victoria, with the right plan, it can be just as large. In Queensland with a generous FiT, the spread is narrower.
A worked example
Using mid-range NSW figures: import tariff 32 c/kWh, FiT 6 c/kWh, spread = 26 c/kWh.
A 10 kWh battery cycling 5 kWh/day (a realistic figure for a household that already self-consumes some solar during the day) saves:
5 kWh × $0.26 × 365 = $475/year
Full daily cycling of 10 kWh would yield ~$950/year, but this assumes you export all 10 kWh every morning and import all 10 kWh back at night — a pattern that requires a large solar array and specific usage timing. Most households land somewhere in between.
What does a battery cost in 2026?
Installed costs for a quality 10 kWh battery currently range from roughly $7,000 to $11,000 after the federal rebate. Before the rebate, installed prices sit at:
- Budget brands (Growatt, GoodWe, AlphaESS): $7,000–$9,000 installed
- Mid-tier (BYD, SolarEdge): $9,000–$12,000 installed
- Premium (Tesla Powerwall 3, Sonnen): $12,500–$16,000+ installed
Federal rebate: The Cheaper Home Batteries Program, which launched 1 July 2025 and was significantly expanded in December 2025, provides an upfront discount of approximately 30% (structured as $244/kWh up to the first 14 kWh as of May 2026). For a typical 10–13 kWh system, this reduces the installed price by roughly $2,500–$3,500.
State rebates: NSW offers up to $1,500 on top of the federal rebate for VPP-connected batteries. Check your state government's energy website for current offers.
Payback periods in practice
Combining the savings and cost estimates above, typical simple payback periods currently sit at:
| Scenario | Annual saving | Installed cost (after rebate) | Payback |
|---|---|---|---|
| SA, high usage, 10 kWh/day cycled | ~$1,400 | ~$7,500 | ~5–6 years |
| NSW/VIC, medium usage, 7 kWh/day cycled | ~$800 | ~$8,500 | ~10–11 years |
| QLD, low usage, 4 kWh/day cycled | ~$420 | ~$8,500 | ~20 years |
Most batteries carry a 10-year warranty from established manufacturers. The SA high-usage scenario clears the warranty period comfortably. The low-usage QLD scenario does not.
Battery degradation narrows long-term savings
Batteries lose capacity over time. Tesla warranties 70% remaining capacity at 10 years; BYD warrants 60%. In practice, LFP chemistry batteries (used in Tesla Powerwall 3, BYD, most modern units) tend to retain 75–85% capacity at 10 years under normal residential use.
What this means: a 10 kWh battery cycling 7 kWh/day in year one will only be able to cycle around 5–6 kWh/day by year 10. Your savings estimates should account for this — annual savings in later years will be lower than year one.
The opportunity cost of capital
At current installed costs of $8,000–$12,000, the opportunity cost matters. Money not invested in a battery could earn 4–5% per year in a term deposit or offset account. A $10,000 battery needs to return around $450–$500/year just to match that baseline — before it starts generating a positive return. This doesn't make batteries unviable, but it's a factor the sales brochure won't mention.
Rising electricity prices work in your favour
Australian residential electricity prices have risen 0.5–9.7% in many states from 1 July 2025. If this trend continues, the annual saving from your battery grows over time, improving the eventual payback.
Where batteries clearly make sense
High-usage households in high-tariff states. If you're importing 12–20 kWh/day from the grid and pay SA or NSW peak rates, a battery can cycle heavily and the numbers work clearly.
Time-of-use tariff users. If you're on a plan with evening peak rates of 40–55 c/kWh (common in NSW, SA, and VIC on shoulder/peak structures), the arbitrage value of a battery is substantially higher than flat-rate calculations suggest.
Households with large solar exports. A 10+ kW system generating significant surplus before evening peak hours gives a battery plenty to store. If you're exporting 15–20 kWh/day at 3–5 c/kWh, you have an asset being wasted.
Backup power priority. If you're in a bushfire-risk area, have a home office, or have medical equipment, the insurance value of backup capability may justify the cost independently of financial ROI. This is a legitimate and often under-counted reason to install.
Where batteries are harder to justify on financials alone
Low solar export households. If your system is undersized relative to your daytime load and you export less than 3–4 kWh/day, there's limited solar surplus to store.
Low tariff spread states or plans. In Victoria, where some retailers have dropped the FiT minimum to near zero but offer 8–10 c/kWh with other plans, the spread can vary widely. Shop for the right plan before assuming the numbers work.
Small homes with low consumption. A 1–2 person household drawing 6–8 kWh/day total, with efficient appliances, will struggle to cycle a 10 kWh battery meaningfully and would be better served by a 5–7 kWh system.
Borderline ROI cases — what installers tell customers. If the payback period sits at 9–12 years and you're within 2–3 years of a move, don't install. If the payback is 12+ years on current electricity prices and you have no backup power need, the numbers don't support it yet. The right advice in these cases is to wait — battery costs are still falling, and the federal rebate programme runs to 2030.
The bottom line
Battery economics have improved materially in the past two years — the federal rebate reduces upfront costs by roughly 30%, and FiTs in most states have fallen enough to widen the tariff spread. For high-usage households in SA, NSW, or VIC on a time-of-use tariff, a battery can realistically pay back in 6–9 years. For low-usage households or those with limited solar export, the financial case is weak without placing significant value on backup power.
The only way to know which camp you're in is to run your actual numbers — your import tariff, your FiT, your daily solar export profile, and an honest cycling assumption.
Our free calculator takes all of these inputs and produces a complete financial model for your specific situation, including the effect of degradation and rising electricity prices over a 25-year horizon.