Compare Solar Batteries 2026: Every Brand We Install, Side by Side
Last updated 30 May 2026 · by PSW's CEC-accredited technical team
The best solar battery in Perth for whole-home backup is the Tesla Powerwall 3 ($11,990 installed); the best modular option is the Sigenergy SigenStor (from $7,490); the best value is the iStore 10kWh ($6,990). All prices include the 2026 federal battery discount.
We install every battery in this table weekly across Perth. Specs are from manufacturer datasheets; prices are our real fully-installed prices after the federal Cheaper Home Batteries discount (2026).
| Product | Usable capacity | Backup power | Coupling | Expandable | Warranty | Installed from |
|---|---|---|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | 11 kW | Hybrid (integrated inverter) | Up to 4 units | 10 years | $11,990 |
| Sigenergy SigenStor | 8.06 kWh/module | 6–12 kW | DC | Up to 48 kWh | 10 years | $7,490 |
| Sungrow SBH | 10 kWh | 5 kW | DC | Up to 40 kWh | 10 years | $8,490 |
| Fronius Reserva | 9.6 kWh | 6 kW | DC | Up to 19.2 kWh | 10 years | $9,990 |
| BYD Battery-Box HVM | 11.04 kWh | 5.1 kW | DC | Up to 22.1 kWh/tower | 10 years | $8,990 |
| GoodWe Lynx F G2 | 9.6 kWh | 5 kW | DC | Up to 25.6 kWh | 10 years | $7,990 |
| iStore ESS | 10.24 kWh | 5 kW | Hybrid | Up to 20.5 kWh | 10 years | $6,990 |
| Alpha ESS SMILE5 | 10.1 kWh | 5 kW | AC (retrofit) | Up to 20.2 kWh | 10 years | $7,490 |
Our verdict
For one-unit simplicity and the strongest backup, choose the Tesla Powerwall 3. For staged growth or built-in EV charging, the Sigenergy SigenStor is unmatched. Retrofitting an existing system? The AC-coupled Alpha ESS SMILE5 bolts onto any array. On a pure budget, the WA-based iStore delivers 10kWh at the sharpest price in the market.
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