Tesla Powerwall 3 vs Sungrow SBR vs BYD HVM: Top 3 Batteries Compared (2026)
Three batteries dominate installer shortlists in Australia in 2026. The Tesla Powerwall 3, the Sungrow SBR HV, and the BYD Battery-Box HVM account for the majority of new residential battery installations across the country. Each has a clear identity: the Powerwall is the premium integrated system, the Sungrow is the efficiency leader, and the BYD is the compatibility champion. Understanding what each actually delivers on the numbers that matter is the whole point of this comparison.
All three use lithium iron phosphate chemistry. All three carry 10-year warranties. All three benefit from the federal rebate of approximately $372 per usable kWh that has applied since 1 July 2025. The differences are in power output, efficiency, inverter flexibility, and how the pricing actually works once you factor in what each system requires.
See the home battery comparison page for the full market view beyond these three.
Quick Specs
| Tesla Powerwall 3 | Sungrow SBR HV | BYD Battery-Box HVM | |
|---|---|---|---|
| Capacity | 13.5 kWh | 12.8 kWh | 13.8 kWh |
| Installed price | ~$16,100 | ~$12,500 | ~$13,600 |
| Post-rebate price | ~$11,650 | ~$8,270 | ~$9,046 |
| Continuous power | 11.5 kW | 9.6 kW | 8 kW |
| Peak power | 22 kW | — | 12 kW |
| Efficiency | 89% | 97% | 96% |
| Coupling | DC (integrated) | DC only | DC only |
| Inverter required | Tesla (built-in) | Sungrow SH required | Fronius, SMA, SolarEdge, GoodWe, Sungrow + more |
| IP rating | IP67 | IP55 | IP55 |
| Scalable to | 54 kWh | 25.6 kWh | 66 kWh |
| Warranty | 10 years | 10 years | 10 years |
| Chemistry | LFP | LFP | LFP |
Price: What You’re Actually Paying
The raw installed prices are $16,100 for the Powerwall 3, $12,500 for the Sungrow SBR HV, and $13,600 for the BYD HVM. After the federal rebate, those become approximately $11,650, $8,270, and $9,046 respectively.
The Sungrow and BYD look significantly cheaper, and for households adding a battery to an existing solar setup, they are. But the Powerwall comparison needs a caveat: the Powerwall 3 includes a full solar inverter. A Sungrow SH hybrid inverter for a new build costs roughly $2,000 to $3,000 installed. A quality Fronius, SMA, or SolarEdge inverter costs similar.
For a new solar installation where you need an inverter regardless, the effective cost of the Powerwall 3 is closer to the Sungrow and BYD than the installed prices suggest. You’re not comparing apples with apples until you add the separate inverter cost to the Sungrow and BYD figures.
For a retrofit where an inverter already exists, the BYD and Sungrow win on price clearly. The Sungrow requires a Sungrow inverter, so if you’re on anything else, you also face inverter replacement costs.
On a per-kWh basis: Sungrow works out at roughly $646/kWh installed, BYD at $986/kWh installed, Powerwall 3 at $1,193/kWh installed. The Sungrow per-kWh figure looks attractive, but only when you already have or are installing a Sungrow inverter.
Efficiency: Sungrow Leads, Tesla Trails
Efficiency order from highest to lowest: Sungrow at 97%, BYD at 96%, Tesla at 89%.
The Sungrow and BYD are closely matched. The Powerwall 3 is in a different bracket. Its 89% round-trip efficiency means for every 100 kWh of solar energy cycled through the battery, you recover 89 kWh. The Sungrow returns 97 kWh and the BYD returns 96 kWh.
Over a year of daily cycling, the efficiency gap between the Powerwall 3 and the Sungrow represents roughly 200 to 250 kWh of extra energy loss. At 35 cents per kWh, that is $70 to $87 per year. Over 10 years, $700 to $870 in lost energy value compared to the Sungrow.
That is not a trivial number. It doesn’t reverse the choice for everyone, but it is real money and worth understanding before you commit.
The Powerwall 3’s lower efficiency is partly structural. When the battery and inverter are integrated into one unit, the DC-to-AC conversion losses from the inverter are included in the overall round-trip efficiency figure. Separate battery-only systems don’t include those inverter losses in their rated efficiency, which partly explains the gap.
Power Output: Powerwall 3 by a Clear Margin
The Tesla Powerwall 3 delivers 11.5 kW continuous and 22 kW peak. The Sungrow SBR HV delivers 9.6 kW continuous. The BYD HVM delivers 8 kW continuous and 12 kW peak.
For daily self-consumption, power output rarely matters. You are not drawing 8 kW from a battery under normal household operation.
Power output matters in one scenario: grid outages. The Powerwall 3 can simultaneously run ducted air conditioning (5 to 7 kW), an induction cooktop (3 to 5 kW), and household loads without approaching its limit. The Sungrow at 9.6 kW handles most homes comfortably with some headroom. The BYD at 8 kW covers a typical home but needs load management if you’re running air conditioning and cooking at the same time.
Three-phase homes need a separate consideration. None of these three batteries are designed as native three-phase backup units. If you’re on three-phase power and whole-home backup across all phases matters, that is a different category of product.
If backup power during outages is a high priority, the Powerwall 3’s output advantage is decisive. If your grid is reliable and backup is a secondary consideration, the Sungrow and BYD are both adequate.
Inverter Compatibility: BYD Wins, Sungrow Is Locked In
This is the dimension that most often determines which battery a household can actually use.
The BYD HVM works with Fronius, SMA, SolarEdge, GoodWe, Sungrow, and a range of other approved inverters. For an existing home with any of these brands already installed, adding a BYD is a straightforward retrofit. No inverter replacement needed.
The Sungrow SBR requires a Sungrow SH hybrid inverter. If your home runs a Fronius, SMA, SolarEdge, or any other brand, you can’t add a Sungrow battery without also replacing your inverter. For new Sungrow installations, this constraint simply doesn’t exist. For retrofit buyers on other brands, it is a hard block.
The Tesla Powerwall 3 solves the inverter question differently by including its own. Your existing inverter becomes redundant. For new builds, this is clean and efficient. For a home with a relatively new SMA or Fronius inverter, replacing it prematurely feels wasteful.
If you already have a Sungrow SH inverter, the Sungrow SBR is the natural pairing. If you have any other major brand, the BYD is the most compatible storage option. If you’re starting from scratch, the Powerwall 3 or a Sungrow complete system are both clean choices.
Weather Protection
Tesla’s IP67 rating is the strongest of the three. IP67 means protection against temporary submersion in water up to one metre, plus full dust protection. Both the Sungrow and BYD carry IP55, which covers dust and water jet resistance.
For the vast majority of Australian installations, IP55 is adequate. A battery mounted on a sheltered wall or in a garage will not be challenged by normal conditions.
The Powerwall 3’s IP67 rating matters in specific situations: coastal properties with driving rain and salt spray, flood-prone areas, exposed outdoor installations without overhead shelter. If any of those apply to your site, the Powerwall 3’s higher protection is worth factoring in.
Scalability
All three can be expanded, but to very different ceilings.
The Sungrow SBR scales from 9.6 kWh up to 25.6 kWh in 3.2 kWh increments. The Tesla Powerwall 3 scales to 54 kWh across multiple units. The BYD HVM scales to 66 kWh.
For a standard household needing 10 to 16 kWh, the Sungrow’s ceiling is sufficient. For larger properties, households planning to support a second EV, or anyone looking at semi-commercial storage needs, the BYD’s 66 kWh ceiling is the most capable option here.
Decision Matrix
| Your situation | Best choice |
|---|---|
| New solar build, want integrated system | Tesla Powerwall 3 |
| New solar build, efficiency-first | Sungrow SBR HV |
| Existing Sungrow SH inverter | Sungrow SBR HV |
| Existing Fronius, SMA, SolarEdge, GoodWe, etc | BYD Battery-Box HVM |
| Backup power is critical priority | Tesla Powerwall 3 |
| Coastal or flood-risk site | Tesla Powerwall 3 |
| Want maximum future scalability | BYD Battery-Box HVM |
| Best efficiency over 10 years | Sungrow SBR HV |
The Powerwall 3 is genuinely good value for new builds once the inverter is factored in, and its backup output is unmatched. The Sungrow is the efficiency leader at a strong post-rebate price, but only for Sungrow inverter customers. The BYD earns its position as Australia’s most popular battery through universal inverter compatibility, competitive pricing, and proven LFP cells.
For rebate details and programme eligibility, see the home battery rebate guide. If you’re deciding between just the Sungrow and BYD, our Sungrow SBR160 vs BYD HVM head-to-head goes deeper on those two specifically.
Common questions
Which of the three batteries has the best round-trip efficiency?
Sungrow leads at 97%, followed by BYD at 96%, and Tesla Powerwall 3 at 89%. The Sungrow and BYD are closely matched. The Powerwall 3 is notably lower, partly because losses from its integrated inverter are included in the overall efficiency figure. Over 10 years of daily cycling, the gap between Powerwall 3 and the others represents several hundred kWh of additional energy loss.
Is the Sungrow SBR HV compatible with my existing inverter?
Only if your existing inverter is a Sungrow SH hybrid model. The Sungrow SBR requires a Sungrow SH inverter and will not work with Fronius, SMA, SolarEdge, GoodWe, or other brands without a full inverter replacement. This is the key limitation of the Sungrow battery and the reason many retrofit buyers choose BYD instead.
Which battery should I choose for a new solar installation?
The Tesla Powerwall 3 is genuinely strong for new builds because its integrated inverter saves $2,500 to $4,000 compared to buying a battery plus separate inverter. The Sungrow SBR HV is the efficiency-first alternative if you’re already committed to a Sungrow system. Both suit new installations; which fits better depends on whether you prioritise power output or efficiency.
How do the three batteries compare on backup power during blackouts?
Tesla Powerwall 3 at 11.5 kW continuous is in a different class. Sungrow at 9.6 kW is a capable second. BYD at 8 kW handles a typical home but needs load management in high-demand scenarios. For whole-home backup including ducted air conditioning and induction cooking at the same time, the Powerwall 3 has a real advantage.
Can all three batteries participate in VPP programmes?
Yes. All three are compatible with Virtual Power Plant programmes in Australia. WA and NSW both offer state incentives worth up to $1,300 and $1,500 respectively for households that connect to an approved VPP. VPP income typically adds $130 to $450 per year on top of regular energy savings, improving payback across all three options.
Frequently Asked Questions
- Which of the three batteries has the best round-trip efficiency?
- Sungrow leads at 97%, followed by BYD at 96%, and Tesla Powerwall 3 at 89%. The Sungrow and BYD are closely matched. The Powerwall 3 is notably lower, partly because losses from its integrated inverter are included in the overall efficiency figure. Over 10 years of daily cycling, the gap between Powerwall 3 and the others represents several hundred kWh of additional energy loss.
- Is the Sungrow SBR HV compatible with my existing inverter?
- Only if your existing inverter is a Sungrow SH hybrid model. The Sungrow SBR requires a Sungrow SH inverter and will not work with Fronius, SMA, SolarEdge, GoodWe, or other brands without a full inverter replacement. This is the key limitation of the Sungrow battery and the reason many retrofit buyers choose BYD instead.
- Which battery should I choose for a new solar installation?
- The Tesla Powerwall 3 is genuinely strong for new builds because its integrated inverter saves $2,500 to $4,000 compared to buying a battery plus separate inverter. The Sungrow SBR HV is the efficiency-first alternative if you're already committed to a Sungrow system. Both suit new installations; which fits better depends on whether you prioritise power output or efficiency.
- How do the three batteries compare on backup power during blackouts?
- Tesla Powerwall 3 at 11.5 kW continuous is in a different class. Sungrow at 9.6 kW is a capable second. BYD at 8 kW handles a typical home but needs load management in high-demand scenarios. For whole-home backup including ducted air conditioning and induction cooking at the same time, the Powerwall 3 has a real advantage.
- Can all three batteries participate in VPP programmes?
- Yes. All three are compatible with Virtual Power Plant programmes in Australia. WA and NSW both offer state incentives worth up to $1,300 and $1,500 respectively for households that connect to an approved VPP. VPP income typically adds $130 to $450 per year on top of regular energy savings, improving payback across all three options.