Compare like with like. Aligned scores, specifications and local evidence within one scoring class or tier.
Market context
Australia purchasing view
BYD | Battery-Box Premium HVS 10.2
76/ 100
Strong evidence coverage · 100%
Evidence checked 2026-08-07
Available in Australia · checked 2026-08-07
Buyer evidence: Ready (100% direct coverage).
AlphaESS | SMILE-G3-S5-INV with SMILE-G3-BAT-9.3S
62/ 100
Strong evidence coverage · 100%
Evidence checked 2026-08-02
Available in Australia · checked 2026-08-02
Buyer evidence: Ready (100% direct coverage).
| Measure | Battery-Box Premium HVS | Smile G3 S5 BAT-9.3S |
|---|---|---|
| Capacity & Usability | ||
| Power & Efficiency | ||
| Longevity (verified) | ||
| Safety & Chemistry | ||
| Guarantee & Backbone | ||
| Energy Ecosystem |
| Measure | Battery-Box Premium HVS | Smile G3 S5 BAT-9.3S |
|---|---|---|
| Architecture | DC-coupled battery | DC-coupled battery |
| Published usable capacity range | 5.12–12.8 kWh | 9.3–37.2 kWh |
| Scored benchmark | 10.24 kWh | 9.3 kWh |
| Chemistry | LFP | LFP |
| Power | 10.2 kW | 5 kW |
| Round-trip | 96.9 % | Not recorded |
| Cycle life | Not recorded | Not recorded |
| Evidence | Battery-Box Premium HVS | Smile G3 S5 BAT-9.3S |
|---|---|---|
| Outcome | Available in Australia | Available in Australia |
| Checked | 2026-08-07 | 2026-08-02 |
| Certifications | The current BCU V2.0 HVS datasheet lists VDE 2510-50, IEC 62619, CEC, CE and UN 38.3 for the exact family. | The current Australian approved-battery export lists SMILE-G3-BAT-9.3S and stacks through six modules to 31 December 2027; the exact system datasheet publishes IEC 62619 and AS/NZS 4777.2. |
| Warranty scope | Australia; the current BCU V2.0 warranty names HVS 10.2, provides a 10-year product term and 70% retained usable energy or 30.82 MWh, whichever performance limit occurs first, for products purchased and installed on or after 1 November 2024. | The exact Australian datasheet publishes 10-year product and battery-performance warranties, governed by current AlphaESS Australia terms and Australian Consumer Law. |
| Warranty remedy | Shenzhen BYD Electronics Co., Ltd. may repair, replace with an equivalent new or previously used part, or provide a partial refund. | Repair or replacement at AlphaESS's option. |
| Labour and reinstallation | The warranty does not promise independent installation labour, travel, removal or reinstallation reimbursement. Removal and reinstallation are not promised. | Installer travel and on-site labour are excluded. Removal and reinstallation are not promised. |
| Freight | Ordinary claim freight is not an unconditional entitlement. BYD pays reasonable disposal cost only when it requires disposal of a replaced item. | Replacement-parts freight is covered for an accepted claim. |
| Transfer and registration | Coverage extends to a subsequent owner who acquires the installed product for their own use and provides proof of ownership. Invoice and system details are required, defects must be notified within 30 days, and performance data must be made available over the internet on request after a claim. | Transfers automatically with the building while the system remains installed; ownership evidence may be required. Initial serial registration and eligible installation are required. |
| Grid compatibility | The Australian HVS/HVM datasheet identifies on-grid, on-grid plus backup and off-grid applications, and requires a compatible inverter from BYD's current HVS/HVM compatible-inverter list. Final inverter listing and DNSP approval remain site-specific. | The exact S5 configuration is a 230 V single-phase hybrid system with 5 kVA backup and AS/NZS 4777.2 grid regulation; final DNSP approval remains installation-specific. |
| Local product pathway | No separate local pathway recorded | No separate local pathway recorded |
| Buyer evidence | Ready (100% direct coverage): Local availability, buyer evidence, and the publication threshold are confirmed. | Ready (100% direct coverage): Local availability, buyer evidence, and the publication threshold are confirmed. |
| Safety notice | No model-specific notice recorded | No model-specific notice recorded |
| Review note | The exact HVS approval remains current until 19 October 2026. The separately listed HVM+ family is not treated as an extension, rename or successor to this HVS record. Shenzhen BYD Electronics Co., Ltd. is the warranty provider and Alps Power Pty Ltd is the Australian service partner. | The exact 9.3 kWh battery module and supported stacks are current Australian approved-battery entries. |
| Sources | Source 1Source 2Source 3Source 4Source 5Source 6Source 7 | Source 1Source 2Source 3 |
These checks sit beside the benchmark score. They are site, tariff and contract questions that no product score can settle.
Ask for every model number to appear on the quote and order. The Clean Energy Council product lists are live: STC creation requires listed products at installation, and network requirements may also depend on current approval.
Have the retailer state the supply phase, inverter connection limit, export limit and any export-control cost. The local network connection agreement, not a generic datasheet, determines those settings. See the Australian Government's connection guidance.
Ask which bills or interval data, tariff, feed-in rate, export limit and future loads support the savings and payback claim. Self-consumed electricity and tariff timing usually matter more than a headline feed-in rate. See the system sizing and battery savings guidance.
Define the usable energy, output power, backed-up circuits and outage behaviour. Confirm whether VPP participation, an internet connection, or an additional controller changes the configuration, reserve level, warranty or support path.
Keep the retailer, installer, manufacturer warranty and escalation path in the contract. Australian Consumer Law guarantees apply separately from any manufacturer warranty; where one business supplied both product and installation, it is generally responsible for the remedy. See the ACCC guidance.
A score lead is only meaningful inside this shared class or tier. Weigh it against the specification and evidence rows above before deciding.
Both products are scored in the Performance & Value class, on the same rubric weighting. Scores are not comparable across classes or tiers. Full methodology.