Solar battery installation in Wollongong

Most of what decides a battery is the same wherever you live. What your home draws in the evening, what your roof makes in the day, and what the federal discount takes off the invoice. We work all three out the same way in Coniston as in Canberra. Before you talk to anyone, read how big a battery your home needs.

Three things are genuinely different in the Illawarra.

The loan here is the NSW Home Energy Saver Loan

New South Wales runs its own offer, and it is the one that applies to your home. Home Energy Saver: up to $15,000 at 0% interest, for households under a $210,000 income test. The ACT's Sustainable Household Scheme is a separate program. It has a different cap, a different rate and no income test, so a figure from a Canberra installer's site may not be yours. You'll find the NSW numbers on the rebates page, and the ACT version on the ACT rebates and loans page if you want to compare.

The federal discount is national, and it steps down

The Cheaper Home Batteries discount applies in Wollongong the same as it does anywhere else, because it's a federal programme. It comes off your invoice on the day. Nothing arrives later. Eligible capacity is tiered, so the first 14 kWh of usable capacity counts in full, the next 14 kWh at 60%, anything above 28 kWh at 15%. And the rate steps down every six months until 2030.

The same battery attracts a smaller discount next year than it does this year. The federal battery discount page sets out the calculation, and the rebate finder works out what your own configuration comes to. If you're pricing a Powerwall, the Powerwall rebate page shows what comes off that one.

Your network is Endeavour Energy

Every grid connected battery needs the distributor's approval before it is switched on, and the Illawarra sits on Endeavour Energy. Their application and their export rules are their own, and they differ from the ACT's. We check what your connection allows before we quote, so an export limit doesn't change your design after you've paid a deposit.

The batteries we install

Most of what we put in is a Tesla Powerwall. One 13.5 kWh unit with the solar inverter built in. On a single phase home with an evening load worth shifting, it's the most straightforward battery to live with. It won't run your home off-grid, and our review of it says where else it falls short. Already own an older unit? The Powerwall 2 page covers the upgrade path and the Australian recall. If you want more storage than one unit holds, the Expansion Pack costs less than a second full battery.

Powerwall is not the only answer. Enphase suits a roof that needs per-panel control, and the GoodWe ESA is the right answer on a tighter budget. If a battery won't pay for itself at your home, we'll say so. That's how we work.

If you're adding solar at the same time as the battery, the full system page covers how the array, inverter and battery get sized together. And if you have an EV in the driveway, the Tesla Wall Connector goes in on the same visit, so nobody comes back for a second one.

Where we go

Wollongong · Thirroul · Austinmer · Coledale · Bulli · Corrimal · Unanderra · Figtree · Shellharbour · Kiama. Our office is at 124–130 Auburn Street, Coniston, and we service the Illawarra from there. Nobody drives down from the ACT, and both offices are on the locations page.Installing across the Illawarra from the ACT since 2026. Sunstak started in Canberra and that's still where most of our work is, so if you're in the ACT, the Canberra Powerwall page is the one for you.

Every review we have is published with the score the customer gave, including the ones we didn't like. The project pages set out real jobs with the customer quoted on each. None of them are Illawarra jobs yet. We entered this market in 2026.