Tesla Powerwall 3 vs Sigenergy SigenStor: Perth Installer's Verdict
PSW Technical Team
Installation & Design Engineers · CEC Accredited Installers · Licensed Electrical Contractors (WA)
Published 5 March 2026
These are the two most asked-about batteries in Perth right now, and we install both weekly. Here's the comparison we give customers in our own showroom.
Head to head
| Spec | Powerwall 3 | SigenStor |
|---|---|---|
| Usable capacity | 13.5kWh fixed | 8kWh modules, up to 48kWh |
| Backup power | 11kW — whole home | 6–12kW depending on stack |
| Solar inverter | Integrated 11kW | Integrated hybrid |
| EV charging | Separate Wall Connector | Optional built-in DC module |
| Installed from* | $11,990 | $7,490 (8kWh) |
*2026 pricing after federal battery discount.
Choose the Powerwall 3 if…
You want maximum backup grunt in a single, set-and-forget unit with the most polished app in the industry. With 11kW of continuous output it will run an entire Perth home, air-con included, through a blackout.
Choose the SigenStor if…
You want to start smaller and grow, or you drive an EV. The stackable design lets you add 8kWh modules as budget allows, and the optional DC fast-charging module is unique in the market.
Our verdict
For most single-battery homes: Powerwall 3. For staged investment or EV households: SigenStor. Both carry 10-year warranties and qualify for the federal discount.