Got Solar? When a Battery Actually Pays — And When It Doesn't
An independent look at whether adding storage to an existing solar system is worth it — or whether your money is better left in your pocket.
You already have panels on the roof and a feed-in tariff that keeps shrinking. The obvious next step looks like a battery — store your cheap daytime solar, use it at night, stop buying expensive grid power. But a battery is a big cheque, and whether it earns that cheque back depends entirely on how you use electricity. We don't sell batteries, so here's the honest version.
What a battery actually does for a solar home
With solar alone, any power you don't use the moment it's generated gets exported for a feed-in tariff — which across most of the country sits somewhere around 3–10 c/kWh and has trended down for years. A battery lets you keep that energy instead and use it when the sun's down, displacing grid power that might cost 25–40+ c/kWh at peak.
The size of that gap is the whole game. The bigger the difference between what you'd be paid to export and what you'd otherwise pay to import, the faster a battery pays off. If your retailer's feed-in tariff is near the top of that range, your battery saves you less, because exporting isn't as painful.
When storage tends to stack up
- Your evenings are busy. Lots of after-dark load — cooking, heating/cooling, EV charging, a pool pump on a timer — means more stored solar actually gets used instead of sitting idle.
- You're on a time-of-use tariff with a steep peak. Peak windows are commonly around 2–8pm (later in some states). If you're paying premium rates in that window, a battery discharging through it earns its keep faster.
- You're exporting a lot. If your solar regularly spills large amounts to the grid for a few cents, that's energy you're almost giving away — exactly what a battery captures.
- You value backup. Some (not all) batteries keep essential circuits running through an outage. That's worth something to some households — just don't confuse it with a financial return.
The catch: when a battery probably won't pay
A battery typically pays back in the order of 8 years, and that's an average — your result can be slower. If most of your power is used during daylight (you're home during the day, or the house is empty until late), your existing solar already covers it and a battery just shifts a small amount of energy for a lot of money.
Watch for these:
- Low evening use. A battery can only save you money on power you'd otherwise buy at night. Small night-time bills mean small savings, however big the battery.
- A decent feed-in tariff. If you're still on a legacy or higher FiT, exporting may genuinely beat storing — do the sums before you give it up.
- Free daytime power windows. The federal Solar Sharer offer (live from 1 July 2026, via participating retailers on an eligible plan with a smart meter) provides a free power window, typically 11am–2pm with a daily cap around 24 kWh. If you can shift heavy loads — hot water, washing, pre-cooling, EV charging — into free or near-free daytime power, you may not need a battery to cut your bill. Availability varies by retailer and state, so confirm it applies to you.
- Warranty vs payback horizon. If the economics only work right at the edge of the warranty period, there's little margin for error.
What rebates reduce the cost today
The federal Cheaper Home Batteries program applies nationally — an STC-based discount worth roughly 30% of battery cost, indicatively around $250–$300 per usable kWh. Since 1 May 2026 it's tiered: the full STC factor on the first 14 kWh, 60% on the 14–28 kWh band, and 15% on 28–50 kWh. The underlying STC factor steps down every January and July, so the dollar value is slightly lower each half-year — worth re-checking the current figure before you commit.
State and territory support varies a lot, and some of it has closed:
- ACT: the Sustainable Household Scheme is a no-fee loan, not a cash rebate — since 1 July 2026, new applicants borrow $2,000–$20,000 at 3% over up to 10 years. Batteries are eligible and the loan stacks with the federal program. Concession-card holders may access Home Energy Support rebates up to $5,000. Confirm current terms.
- NT: the Home & Business Battery Scheme is closed — its funding is exhausted. NT battery support is the federal program only unless it's re-funded.
- Everywhere else: state-specific battery incentives change frequently. Confirm what's live in your state before counting on it — don't assume a figure from a neighbour's quote still applies.
How to make the call for your own home
Pull out a recent bill and look at three things: your feed-in tariff, your peak import rate, and how much energy you actually use after dark. If you export a lot, buy a lot at peak, and have steep evening use, storage likely stacks up. If your bills are modest, you use most power in daylight, or you can shift loads into a free daytime window, the honest answer may be that your money does more sitting in your account than in a battery.
We don't sell batteries, panels or plans — we charge a small fixed fee to model your actual bill and usage, then tell you plainly whether storage pays for you. Sometimes the right answer is "not yet", and we're happy to be the ones who say it.
Want to know what actually pays for your place?
Get an independent, engineered read on your whole bill — solar, battery, tariff and the rebates you're really entitled to — for a small fixed fee. No system to sell, no sales call.
Start your audit — $100Figures in this guide are current at the date of publication and indicative only — rebate and certificate values change over time (federal battery certificates step down each January and July), and state schemes are amended often. Confirm the current numbers for your situation before you commit. This is general information, not personal financial advice.