Tesla Powerwall vs Sungrow: which battery suits your home?
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Short answer: Powerwall 3 is a single 13.5 kWh unit that brings its own solar inverter and works with solar you already have [SB-S052, E]. Sungrow SBR is a stack you build from 3.2 kWh modules, and it needs a Sungrow hybrid inverter [SB-S051, C]. Powerwall suits an existing solar home that wants one box; Sungrow suits a Sungrow inverter home or a smaller budget size [SB-S052, SB-S137, E].
Side by side (as at 3 November 2026)
| Tesla Powerwall 3 | Sungrow SBR | |
|---|---|---|
| Usable storage | 13.5 kWh per unit [SB-S052, C] | 6.4–25.6 kWh usable in 3.2 kWh steps [SB-S137, SB-S071, C] |
| Power | 5 / 10 / 11.04 kW AC [SB-S052, C] | 5.76–15.36 kW rated DC, per Sungrow's older V1.2 datasheet (2021) [SB-S139, C]; not in the current V5 [SB-S137] |
| Round-trip efficiency | 89% solar-to-battery-to-home [SB-S052, C] | MISSING |
| Warranty | 10 yrs; 70%; unlimited cycles for self-use/time-based/backup, else 37.8 MWh [SB-S053, C] | 10 yrs; 70%; unlimited cycles for self-use/backup, else a cap by size [SB-S050, C] |
| Installed price, seller's own date | $10,633–$12,633 after discount, incl. backup, Canberra, as at Sep 2026 [SB-S061, C] | one 30 kWh package from $13,268.78 after discount, as at 3 Nov 2026 [SB-S098, C]; model MISSING |
| Backup | Backup Gateway 2 [SB-S052, C] | MISSING until we read the SH inverter datasheet |
| CEC approved list | listed to 17 Oct 2027 [SB-S070, C] | SBR listed to 30 Dec 2026 [SB-S071, C] |
Discount at typical sizes (our arithmetic, not a quote)
Powerwall 3: 91 STCs, about $3,608. Sungrow SBR128 (12.8 kWh): 87 STCs, about $3,450 [SB-S036, SB-S095, E]. The discount is set by the day the battery goes in, not the day you sign, so check the rules before you get quotes [SB-S004, C]. The factor drops to 5.7 for installs from January 2027 [SB-S036, C]. The discount is set by the installation date [SB-S004, C]. It needs a CEC-listed, VPP-capable battery installed with solar by an SAA battery-endorsed installer [SB-S003, C]. The STC price moves, so your installer's figure will differ. Official rules: cer.gov.au and dcceew.gov.au.
Who each one suits
Powerwall 3 suits you if your solar inverter is fine and you want backup included in one price [SB-S052, SB-S061, C].
Powerwall 3 is not for you if you only need 6–10 kWh: you can't buy a smaller Powerwall 3 [SB-S052, E].
Sungrow suits you if you already run a Sungrow hybrid inverter [SB-S051, C].
Sungrow is not for you if your install is in 2027 and the model's listing hasn't been renewed: ask to see it [SB-S071, E].
More
In NSW the VPP incentive stacks with the federal discount [SB-S007, C]: what NSW buyers get. If your second quote is Sigenergy, its 8.76 kWh modules change the maths: Sungrow or Sigenergy and Tesla against Sigenergy [SB-S060, C]. FoxESS has a dated Sydney list, unlike Sungrow SBR: the FoxESS comparison with Sungrow [SB-S099, C]. Without panels there's no federal discount [SB-S003, C]; we cover what a battery alone can do if you have no panels yet.
Ask your installer, in writing
- The exact model on the CEC list, usable kWh and listing end date [SB-S026, SB-S071, C].
- STC count and the install date it assumes [SB-S004, C].
- What stays on in a blackout, and its cost.
- Warranty years, 70% figure, throughput cap.
Rules checked 3 November 2026. Next scheduled check: before 1 January 2027 (STC step-down), and monthly for WA and NSW.