July home battery volumes triple their year-on-year level despite small step back

SunWiz data shows home battery energy storage installation volumes are about triple their year-on-year level since the Cheaper Home Batteries scheme began July 2025 when volumes were 320 MWh, despite a slight waning of 1.55% in June 2026 to sit at 990 MWh.

States and territories volumes reflect the easing, with Queensland, South Australia, the Australian Capital Territory (ACT), and Western Australia (WA) remaining in the positive, and Victoria, Northern Territory (NT) and Tasmania returning negative volumes, with New South Wales steady.

SunWiz Managing Director Warwick Johnston says the amount of kWh registered in July was roughly comparable to that registered in June, because systems installed in April were still being registered in appreciable volumes in June.

“Our analysis of installation month figures that eliminate the smoothing effects seen in our charts reveals a market that is quickly recovering,” Johnston said.

“Our analysis shows June is likely to be 750 MWh and July 945 MWh – far lower than the 3.2 GWh installed in April but comparable to volumes in October 2025.”

System size

July’s national average system size of 22.6 kWh also marks a third straight monthly decline from April’s 44 kWh and June’s 26.16 kWh, though remains above the August 2025 average size of 20.7 kWh.

SunWiz data suggests demand for home batteries is consolidating toward smaller system sizes where the 20-30 kWh band led volume in July at 322.2K, overtaking the 40-50 kWh band which fell to 276.5K, after peaking in May 2026 at 959.8K.

As the market shifts toward smaller capacities, Victoria’s average system size now sits at 29.94 kWh, well above all other states and territories, which range from 17.69 kWh in WA and 21.72 kWh in the ACT, Tasmania and the NT.