Compare like with like. Aligned scores, specifications and local evidence within one scoring class or tier.
Market context
Australia purchasing view
BYD
75/ 100
Strong evidence coverage · 62%
Evidence checked 2026-06-16
Available in Australia · checked 2026-07-16
Buyer evidence: Ready (62% direct coverage).
AlphaESS
62/ 100
Strong evidence coverage · 100%
Evidence checked 2026-07-16
Available in Australia · checked 2026-07-16
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 |
|---|---|---|
| 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 % | 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 | 2026-07-16 | 2026-07-16 |
| Certifications | BYD's HVS/HVM Australia datasheet names HVS 10.2 and lists VDE2510-50, IEC 62619, CEC, CE and UN 38.3. | The exact Australian SMILE-G3-S5/B5 + BAT-9.3S datasheet lists AS/NZS 4777.2 grid regulation, IEC 62109 and IEC 62040 safety standards, IEC 61000 EMC, and IEC 62619 for the battery module. |
| Warranty scope | Australia; the HVS 10.2 is named in BYD's Australian HVS/HVM limited warranty, with a 10-year product warranty subject to its terms. | The exact Australian datasheet lists a 10-year product warranty and 10-year battery-performance warranty for SMILE-G3-S5/B5 with BAT-9.3S. Alpha ESS Australia's current residential warranty terms name the SMILE-G3-S5 system, apply to installations from 1 November 2024, and are additional to Australian Consumer Law rights. |
| 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 inverter configuration is a 230 V single-phase hybrid system with a 5 kVA backup port, integrated anti-islanding and AS/NZS 4777.2 grid regulation. Final DNSP approval remains installation-specific. |
| Buyer evidence | Ready (62% 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 | BYD's Australian download centre publishes the HVS/HVM AU datasheet, installation manual, and warranty material. | This is the current 9.3 kWh module configuration documented in AlphaESS Australia's April 2026 resource-centre material. It is distinct from the historical BAT-10.1P record retained elsewhere in the benchmark. |
| Sources | Source 1Source 2Source 3 | Source 1Source 2Source 3Source 4 |
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.