TL;DR
Get backup power and energy gear delivered free with Prime
- Fast, free delivery on millions of items
- Prime Video, Amazon Music and more included
- Member-only deals all year
Australia registered an estimated 966.5 MWh of home battery capacity in September 2026, a 12.5% increase from August, according to SunWiz data reported by Energy Storage. Small-scale solar registrations rose 7.29% to 311.8 MW, while the battery total remained well below April’s 3,262 MWh peak.
Australia registered an estimated 966.5 MWh of home battery capacity in September 2026, up 12.5% from August, according to energy data analyst SunWiz, as small-scale solar installations also increased. The battery figure was the strongest monthly result since April, when registrations reached 3,262 MWh, and shows a partial rise from the months that followed that peak.
SunWiz’s September estimate compares with 859 MWh registered in August. The reported battery capacity is an estimate of registrations, not a count of battery units. SunWiz Managing Director Warwick Johnston said the market had stabilized near 1 GW a month; the report does not provide a detailed monthly series or define that characterization beyond the stated September and August figures.
Alongside batteries, Australia registered 311.8 MW of small-scale solar, defined in the report as systems from 0 to 100 kW. That was 7.29% above August’s 290 MW and one of the year’s highest monthly totals, behind April’s 505 MW and July’s 320 MW. The September figure was also above the approximately 240 MW recorded in September 2025.
Battery installations were concentrated in larger systems. The 20–30 kWh category led, with 368 MWh registered, up 13% from the previous month. The 40–50 kWh band contributed 250 MWh and the 30–40 kWh band 190 MWh. SunWiz put the national average battery size at 26.30 kWh, its fourth consecutive monthly increase. The report said 45% of the market was above 30 kWh.
Battery Uptake Remains Below April’s Peak
The rise matters because battery registrations and rooftop solar installations are moving upward together, potentially adding household capacity to store electricity generated on site. However, the September total should be read against the year’s much higher April result: 966.5 MWh was less than a third of April’s 3,262 MWh. The reported rebound from August therefore does not, by itself, establish that the market has returned to its peak pace.
System size also shapes what the numbers say about the market. The report’s growth was concentrated in batteries of 20 kWh or more, while registrations in smaller categories declined. This distribution may be relevant to households, installers and policymakers tracking the type of capacity being added, but the figures do not explain why buyers selected particular sizes or how much electricity the installed systems will supply.
SunWiz attributed support for solar demand to the federal government’s Cheaper Home Batteries Scheme, which the report says requires a residential battery to be installed alongside a new or existing solar system to qualify for the rebate. The data show installations rising during the scheme’s operation; they do not isolate the rebate’s effect from other influences on household purchases.
As an affiliate, we earn on qualifying purchases.
Solar and Battery Figures Together
The September figures cover two related but distinct measures: solar capacity in megawatts and battery capacity in megawatt-hours. They should not be treated as interchangeable. Solar registrations measure generation capacity, while battery registrations measure energy storage capacity. SunWiz’s solar total covers systems rated from 0 to 100 kW.
Solar installations rose across much of the country, though not everywhere. Five of Australia’s eight states and territories recorded increases, according to Johnston. Queensland registered 91.8 MW, 14% more than in August, and New South Wales added 90.1 MW, an 11% monthly increase. The report said the 10–15 kW solar-system category was the largest, at 105.94 MW, followed by 6–8 kW systems at 53.04 MW and 15–20 kW systems at 43.41 MW.
The national average solar system size was 9.98 kW, up from 9.86 kW in August. Johnston also said the January-to-September solar tally was 43% above the same period in 2025 and had already surpassed the total installed during all of 2025. These are SunWiz’s reported comparisons; the article does not provide the underlying monthly dataset.
As an affiliate, we earn on qualifying purchases.
Limits of the September Estimate
The reported battery figure is an estimated registration total, and the source material does not explain the estimation method, whether later revisions are expected, or how registrations relate to completed installations in the same month. It also does not give the number of batteries installed, their locations, or the total number of participating households.
The report supplies month-to-month comparisons and selected historical benchmarks, but not a complete 2026 monthly battery series. That makes it difficult to assess how September fits into the broader trend or to test Johnston’s description of the market stabilizing near 1 GW a month. The source also does not break down the data by state for batteries, provide costs, or measure the scheme’s effect separately from other market factors.
As an affiliate, we earn on qualifying purchases.
Next Monthly Registration Figures
The next useful comparison will be SunWiz’s figures for October, which can show whether September’s increase continued or was a one-month rise. Readers should look for both the registered battery capacity and the size distribution: changes in the 20–30 kWh and above-30 kWh categories would help clarify whether the September pattern persisted.
Further reporting could also establish whether the September estimate is revised, how battery registrations vary by state and how the Cheaper Home Batteries Scheme relates to installation trends. The supplied report does not state when SunWiz will publish its next update or announce any new policy or market milestone.
As an affiliate, we earn on qualifying purchases.
Key Questions
How much home battery capacity was registered in Australia in September?
SunWiz estimated 966.5 MWh of home battery capacity was registered in September 2026, up from 859 MWh in August.
Was September a record month for battery installations?
No. The report identifies April 2026 as the higher monthly benchmark, at 3,262 MWh. September was the strongest month since that April peak, according to the report.
Which battery size category had the most registered capacity?
The 20–30 kWh category was the largest, with 368 MWh registered in September, up 13% from August.
Did rooftop solar installations also rise?
Yes. Small-scale solar registrations reached 311.8 MW, 7.29% above August’s 290 MW. The measure covers systems from 0 to 100 kW.
Does the report prove the battery rebate caused the increase?
No. SunWiz managing director Warwick Johnston said the federal scheme was supporting solar installations, but the report does not isolate the rebate’s effect from other factors.
Source: rss
Halloween Picks
halloween
As an affiliate, we earn on qualifying purchases.
