Compare Solar Batteries 2026: Every Brand We Install, Side by Side
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).
Last updated · by PSW's CEC-accredited technical team
For whole-home backup we quote the Tesla Powerwall 3 ($11,990 installed). For a modular system we quote the Sigenergy SigenStor (from $7,490). The lowest installed price in this table is the iStore 10kWh ($6,990). All prices include the 2026 federal battery discount.
| Battery | 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 |
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Usable capacity, power and warranty terms as published by each manufacturer. Backup behaviour depends on your switchboard and phase configuration, and the exact specification is confirmed on quote.
Our verdict
For a single unit with whole-home backup, we quote the Tesla Powerwall 3. For staged growth or built-in EV charging, we quote the Sigenergy SigenStor. Retrofitting an existing system? The AC-coupled Alpha ESS SMILE5 connects to an existing array. On a lower budget, the WA-based iStore is the lowest 10kWh price in this table.
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