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A home battery lets you store solar energy for evening use, buy cheap grid electricity and use it at peak time, or keep your home running during a blackout. In Australia, battery storage is rapidly becoming one of the most valuable household energy investments — particularly on time-of-use tariffs where the spread between midday and peak rates can reach 35¢/kWh. The Jousto battery catalogue includes standalone battery systems, hybrid inverter-battery bundles, and stackable storage options from brands including Tesla, Sungrow, AlphaESS, and BYD.
How to Choose
- Capacity (kWh): Size your battery against your evening consumption. Most households use 8–15kWh after solar production drops off. A 10kWh battery covers most suburban households.
- Usage pattern: If you're on a flat tariff, backup and self-consumption are your primary benefits. On a TOU tariff, grid arbitrage adds a further $800–$1,200/year of value.
- Solar compatibility: Most batteries require a compatible hybrid inverter. If you have an existing solar system, check inverter compatibility before selecting a battery brand.
- Backup capability: Not all batteries provide blackout protection. If backup is a priority, confirm the system includes a backup gateway or whole-home backup capability.
- Budget tier: Entry-level: BYD, Sungrow. Mid-range: AlphaESS, GoodWe. Premium: Tesla Powerwall. System sizing matters more than brand for payback period.
Common Questions
Are solar batteries worth it in Australia in 2026?
Yes — on a time-of-use tariff, a 10kWh battery typically saves $1,200–$1,800 per year through grid arbitrage and solar self-consumption combined. Payback periods are 6–9 years on current electricity prices, with most batteries warranted for 10+ years. The business case is stronger than it was two years ago.
Can I add a battery to my existing solar system?
Usually yes, but compatibility matters. If your inverter supports AC-coupling, you can add a battery without replacing the inverter. If you have a string inverter, a DC-coupled battery requires a new hybrid inverter. A Jousto design session can assess your existing system before you commit.
What size battery do I need?
Calculate your evening consumption (from when solar stops generating until midnight). Most homes need 8–13kWh to cover this window. Oversizing costs money without proportional benefit unless you're planning to use arbitrage charging from the grid.
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