The honest answer: solar panels without a battery still save most Australian households a lot of money. A battery makes the savings even better — but only if the numbers work out for your situation.
What a Battery Actually Does
Solar panels generate electricity during the day. If you're not home, most of that goes into the grid at whatever low feed-in tariff your retailer pays (sometimes as low as 4–5 cents/kWh). Then you come home in the evening and buy electricity back at 30–35 cents/kWh. That arbitrage — selling cheap, buying expensive — is the core problem a battery solves.
A battery stores your excess daytime solar and releases it in the evening when you need it, letting you use your own cheap electricity instead of buying expensive grid power at night.
Who a Battery Makes Strong Sense For
Households out all day
If everyone is at work and school during solar hours, your self-consumption rate without a battery is low — you're exporting most of your generation at a poor rate. A battery turns that exported energy into evening savings instead.
High evening electricity users
Families with high evening usage — cooking, dishwashers, air conditioning, TVs — benefit more from a battery because there's more demand to fill with stored solar.
EV owners (or future EV owners)
If you charge an EV at home, your overnight electricity demand jumps significantly. A solar + battery system can cover most or all of that charging cost. Some systems (like the Tesla Powerwall 3) have built-in EV charging integration.
People on time-of-use tariffs
If your retailer charges peak rates in the evening (6–10pm) and off-peak rates overnight, a battery lets you avoid peak pricing entirely. This can add significantly to the financial case.
Households wanting backup power
Solar alone does not power your home during a blackout — by law, it shuts down for safety. A battery with backup capability (Tesla Powerwall, some Sungrow models) keeps essential circuits running through an outage.
Who Should Probably Wait on a Battery
Predominantly daytime users
If you work from home, have young children at home, or run pool pumps and appliances during the day, your self-consumption rate is already high. A battery adds less value because you're already using most of your solar directly.
Very tight budgets
A quality installed battery adds $8,000–$14,000 to your system cost. If that stretches the payback period to 12+ years, it may not be the best use of your money right now. Solar without a battery still pays back in 4–6 years for most households. Getting solar now and adding a battery later (with a hybrid inverter) is a valid strategy.
High feed-in tariff earners
If you've locked in a high FiT rate (10¢+), the financial case for a battery is weaker — you're already being paid reasonably well to export. Check your rate before adding a battery.
What Batteries Cost in 2026
| Battery | Capacity | Installed Price (approx, before rebate) |
|---|---|---|
| Tesla Powerwall 3 | 13.5kWh | $14,000–$17,000 |
| Sungrow SBR016 (modular) | 9.6–19.2kWh | $8,000–$13,000 |
| BYD Battery-Box Premium | 10.2kWh | $8,500–$11,000 |
| Enphase IQ Battery 10 | 10.1kWh | $10,000–$13,000 |
Prices have been falling steadily and are expected to continue declining. If the numbers don't quite stack up today, they may in 2–3 years.
Federal Battery Rebate — Cheaper Home Batteries Program
From 2025, the federal government's Cheaper Home Batteries Program provides an upfront discount of roughly $336–$372 per usable kWh of battery capacity (the rate dereates every 6 months). For a typical 10kWh battery, that's around $3,100–$3,700 off the installed price — making batteries significantly more accessible than they were even 12 months ago.
- All states: Federal rebate applies nationwide — roughly 30% off most battery systems
- SA: Home Battery Scheme may offer additional state-level subsidies — check current availability at energy.sa.gov.au
- QLD/NSW/WA/VIC: Check current state programs — these change regularly and stack on top of the federal rebate
The Smarter Move: Hybrid Inverter Now, Battery Later
If you're not sure yet, the best hedge is to get a solar system with a hybrid (battery-ready) inverter rather than a standard string inverter. The cost difference is typically $500–$1,500. When you decide to add a battery — whether that's next year or in five years — you won't need to replace the inverter.
Get the Numbers for Your Situation
Whether a battery makes financial sense depends entirely on your usage patterns, your current electricity rate, your feed-in tariff, and your state's incentives. Upload your electricity bill to GridBeater and we'll show you both the solar-only and solar + battery scenarios for your home.
See your solar + battery savings → Upload your bill free at GridBeater