Battery boom meets old switchboards: home batteries in northern Sydney by postcode

How many northern Sydney homes added a battery since the rebate started?

28,641 batteries across 64 postcodes in 14 months, or 127.4 for every 1,000 separate houses. The rate for Greater Sydney is 104.9, so northern Sydney is 21% ahead.

The gap is not about housing mix. Separate houses make up 55% of occupied homes in our area and 56% in the rest of Sydney, so the two areas start from a similar base. Northern Sydney homes are also choosing slightly larger systems: an average of 33.4 kWh of usable capacity per battery, against 32.7 kWh elsewhere in Sydney.

Which northern Sydney postcodes have the most home batteries?

Kellyville and North Kellyville (2155) leads at 200.2 per 1,000 houses, followed by West Pennant Hills (2125) and Cherrybrook (2126). Church Point (2105) is lowest at 59.6. 39 of the 55 ranked postcodes beat the Greater Sydney rate.

The Hills District stands out: 6 of its 6 postcodes beat the Sydney average, and separate houses make up 82% of homes in Kellyville. At the other end, the last three ranked places all go to the Pittwater end of the Northern Beaches, with Avalon Beach second last. Postcodes with a suburb page on this site are linked, and apartment-heavy postcodes on the Lower North Shore are listed at the end without a rank.

Postcodes with fewer than 500 separate houses are left out of the table (2061 and 2089) but count in the area totals. Region labels follow our service areas.

How has battery uptake changed month by month?

Installs rose from 6.8 per 1,000 houses in July 2025 to a peak of 24.4 in April 2026, then fell to 4.5 in May. Northern Sydney ran ahead of the rest of Sydney in every month.

The April spike lines up with the first change to the program. From 1 May 2026 the discount began stepping down every six months and was tiered by battery size, so larger batteries now get less support per kWh. In the area, 5,472 batteries went in during April alone, 19% of the 14-month total, and 24,374 went in before May.

Battery size followed the same path. Across Greater Sydney the average usable capacity per battery rose from 18.9 kWh in July 2025 to 41.0 kWh in April 2026, then dropped to 24.1 kWh once support above 14 kWh was cut back.

Are the batteries going onto homes that already have solar?

Mostly, yes. Over the same 14 months the area registered 14,075 new solar installations and 28,641 batteries, or 2.0 batteries for every new solar system. At least 51% of the batteries went in beside panels already on the roof.

Every battery in the program has to be installed alongside new or existing solar panels, so batteries outnumbering new solar installations points to retrofits on roofs that already had panels. That matters at the switchboard. A retrofit often adds a second inverter beside the existing solar one, and both need their own protection and isolation at the board. The CER counts include upgrades to existing systems, so treat the ratio as a guide.

Why does an older switchboard often need work before a battery goes in?

A battery adds new circuits and isolation to the board, and often a second inverter. Older boards often lack the space or the RCD protection to take that, so they are upgraded first. These are the typical reasons we see; every home is different and the board is checked before a quote.

• Space on the board. The battery inverter needs its own circuit breaker, and an AC coupled system adds one more beside the existing solar breaker. Full boards, common after years of extensions, have no room left for those.
• RCD and RCBO protection. New circuits need safety switch protection under the wiring rules (AS/NZS 3000). Boards with ceramic fuses or one old safety switch are usually replaced with breakers and RCBOs at the same time.
• AC or DC coupling. AC coupling keeps the existing solar inverter and adds a battery inverter, which means two supplies into the board. DC coupling swaps the old solar inverter for a hybrid one. The CER requires the inverter the battery connects to be VPP capable.
• Isolation and signage. A battery is a second source of supply. Isolators and warning labels at the board tell anyone working on it that turning off the main switch does not make everything dead.
• Backup circuits. If you want lights and the fridge to stay on in an outage, those circuits are usually moved to a separate backed-up section or sub-board.
• Battery location. AS/NZS 5139 limits where a battery can go, including keeping it out of habitable rooms. That can set a longer cable run back to the board.
• Meter and network approvals. The installer applies to the network before connecting: Ausgrid across most of northern Sydney, Endeavour Energy in much of the Hills District. If the meter panel needs work, older panels may contain asbestos and are handled with the right precautions.

We install home batteries and upgrade switchboards for battery installs across northern Sydney. See home battery installation for how a job runs, or switchboard upgrades if you want the board ready before you choose a battery.

What rebates are there for home batteries in NSW?

The main one is the federal Cheaper Home Batteries Program, which started on 1 July 2025 and works through the Small-scale Renewable Energy Scheme. The NSW battery installation discount has closed for homes, but the NSW virtual power plant incentive is still available and can be combined with the federal discount.

Every line below comes from the official page linked beside it, checked on 8 October 2026. We have not quoted dollar amounts because they depend on the battery's size and its install date. Your installer or VPP provider will confirm the figure for your system.