Solar & Battery in Tarragindi: What a 14kW System Really Costs (2026)

Tarragindi sits on some of Brisbane’s better solar real estate — elevated, largely north-facing, and close enough to the city that most homes here are on standard Energex residential tariffs. The question locals ask us is rarely whether solar works. It is whether adding a battery is worth the extra outlay.

We recently completed a system in Tarragindi that answers it fairly directly. Here are the real numbers.

The system we installed

The household was on a rising bill and wanted to stop feeding cheap power back to the grid during the day only to buy it back at peak rates after dark. We specified:

• Solar array: 16 × LONGi Hi-MO X6 MAX 475W panels — 14.2kW total, with a 25-year product and 25-year performance warranty
• Inverter: Sigenergy SigenStor EC 15.0TP, 15.0kW, 10-year warranty
• Battery: 4 × Sigenergy 9kWh modules — 36.2kWh of usable storage, 10-year warranty

That is a large battery by Brisbane standards. It was sized deliberately, and the reason matters if you are weighing up your own system.

What 14.2kW actually generates in Tarragindi

The array produces 12,226 kWh per year. Spread across the seasons, average daily output looks like this:

The number worth noticing is winter. At 52 kWh on an average June or July day, this system still generates more than most Brisbane households consume. Queensland winters are mild and clear, which is why solar economics here hold up far better than they do in Melbourne or Hobart.

Why the battery was sized at 36.2kWh

A common mistake is sizing a battery to a headline figure rather than to the gap between when you generate and when you use power. This household’s consumption was concentrated in the evening. A smaller 10kWh battery would have been full by mid-morning, leaving the rest of the day’s generation exported at a feed-in rate of a few cents.

At 36.2kWh, the battery absorbs a full summer day’s surplus and carries the house through the evening peak and overnight. The practical result is that very little of the array’s output is sold cheaply and bought back expensively.

The financial picture

The $7,950 in rebates came through Small-scale Technology Certificates, applied as an upfront discount rather than something claimed back later. That figure is tied to installation date, not signing date — which matters, because the federal scheme steps down on 1 January 2027.

What the homeowner said

Justin left a verified five-star Google review after the install, noting that the team worked through the design and installation while answering what he described as a barrage of questions, and gave solid advice throughout.

Is a battery worth it in Tarragindi?

Honestly, it depends on two things.

When you use power. If your household is empty from 8am to 6pm, most of your generation is exported at a low feed-in tariff. A battery converts that exported power into power you would otherwise buy at peak rates. That is where the return comes from.

How long you plan to stay. Batteries carry a 10-year warranty and a payback measured in years, not months. If you are selling in eighteen months, solar alone is the better financial decision.

For a household that is home in the evenings and staying put, the Tarragindi numbers speak for themselves.

See the full breakdown

Every figure above is documented, including the month-by-month generation profile and the full equipment list: 14.2kW Solar + 36.2kWh Battery in Tarragindi, Brisbane.

If you are in Tarragindi, Holland Park, Moorooka or Annerley and want a system sized against your actual usage rather than a generic package, get in touch for a quote.