Compare like with like. Aligned scores, specifications and local evidence within one scoring class or tier.
Market context
Australia purchasing view
SOFAR | ESI 3K-S1, ESI 3.68K-S1, ESI 4K-S1, ESI 4.6K-S1, ESI 5K-S1 and ESI 6K-S1
73/ 100
Strong evidence coverage · 100%
Evidence checked 2026-08-02
Available in Australia · checked 2026-08-02
Buyer evidence: Ready (100% direct coverage).
FoxESS | KH7, KH8, KH9, KH9.9, KH10 and KH10.5
74/ 100
Strong evidence coverage · 100%
Evidence checked 2026-08-06
Available in Australia · checked 2026-08-05
Buyer evidence: Ready (100% direct coverage).
marks the better value on rows where a higher number is better. Temperature coefficient counts as higher when it is closer to zero. Size measures such as rated power carry no marker, because a larger product is a different choice rather than a better one.
| Measure | PowerAll ESI 3-6K-S1 | KH |
|---|---|---|
| Efficiency | ||
| Design & Flexibility | ||
| Thermal & Physical Resilience | ||
| Features & Integration | ||
| Safety & Compliance | ||
| Guarantee & Backbone | ||
| Energy Ecosystem |
marks the better value on rows where a higher number is better. Temperature coefficient counts as higher when it is closer to zero. Size measures such as rated power carry no marker, because a larger product is a different choice rather than a better one.
| Measure | PowerAll ESI 3-6K-S1 | KH |
|---|---|---|
| Architecture | Hybrid inverter | Hybrid inverter |
| Published rated AC power range | 3–6 kW | 7–10.5 kW |
| Scored benchmark | 6 kW | 10.5 kW |
| Power | 6.0 kW | 10.5 kW |
| Type | Hybrid | Hybrid |
| Peak eff | 97.8 % | 97.8 % |
| MPPTs | 2 | 4 (better value on this row) |
| Evidence | PowerAll ESI 3-6K-S1 | KH |
|---|---|---|
| Outcome | Available in Australia | Available in Australia |
| Checked | 2026-08-02 | 2026-08-05 |
| Certifications | The exact ESI 3-6K-S1 manual lists IEC 62109-1/-2 and AS/NZS 4777 alongside several additional national grid standards. | The current Australian approved-inverter export lists FOXESS KH10.5 (AS4777-2 2020) from 13 June 2025 to 13 June 2028. |
| Warranty scope | SOFAR Australia's published factory warranty covers ESI-series energy-storage inverters for 120 months and includes one freight movement plus labour and material needed to restore a functioning product, subject to the claim conditions. Paid extension options are available. | FoxESS Australia's inverter warranty names KH7, KH8, KH9, KH9.9, KH10 and KH10.5 and provides 120 months from installation, capped at 132 months from manufacture. Annual authorised inspection is required from year six and service or transport rebates are conditional. |
| Warranty remedy | On-site or off-site repair, replacement or equivalent remedy. | FoxESS may repair or replace an approved defective product under the governing terms. |
| Labour and reinstallation | Necessary approved repair labour and material are covered. Travel and unauthorised third-party costs are excluded. | The warranty does not establish an uncapped owner-selected labour entitlement; approved service is subject to FoxESS processes and limits. No uncapped removal and reinstallation entitlement was established in the governing terms. |
| Freight | One freight movement is covered. | Transport support is subject to the governing claim process and exclusions; no uncapped transport entitlement is stated. |
| Transfer and registration | No subsequent-owner transfer right was found in the governing terms. Paid extensions to 15 or 20 years are subject to the purchase deadline. | No express subsequent-owner transfer right was found in the governing Australian inverter warranty. The claim must satisfy the warranty's purchase, installation, evidence and notification requirements. |
| Grid compatibility | The exact family supports Australian grid settings, a 0.8 leading-to-lagging power-factor range and demand-response controls. Final CEC product status, DNSP export limits, meter configuration and backup-circuit design remain installation-specific. | The exact KH10.5 is approved to AS/NZS 4777.2:2020. DNSP export and interoperability settings remain installation-specific; AusNet also lists the exact model in its interoperable inverter register. |
| 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 | SOFAR publishes exact Australian product and warranty material, local support contacts and a 2026 statement that this family remains its core standard-home system. | The 10.5 kW highest Australian model in the KH series now has exact current approval evidence. |
| Sources | Source 1Source 2Source 3 | Source 1Source 2Source 3Source 4Source 5 |
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.
Confirm the proposed inverter phase, PV input design, battery pairing and export-control configuration against the final connection agreement. A suitable product can still require a different site design or control setting.
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 Value & Volume class, on the same rubric weighting. Scores are not comparable across classes or tiers. Full methodology.