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Fox ESS and Sigenergy are both fast-growing Chinese-made battery brands gaining traction in Perth. Fox ESS offers an unusually broad range of modular capacities at competitive prices; Sigenergy's SigenStor is a high-power, flexible inverter-plus-battery tower. This is a fair, spec-led comparison for WA homes. Sigenergy's SigenStor line spans two CEC-approved hardware generations — modules first approved Jan 2024 and a newer generation from Jan 2026 — both remain CEC-active and individually resolvable; see the generation breakdown for what changed.
Quick answer
Fox ESS tends to suit value-focused buyers who want modular storage with a wide range of capacity options, and are comfortable with a newer but growing brand. Sigenergy tends to suit buyers who prioritise power output, three-phase or whole-home backup, and an all-in-one stack, and are comfortable with a fast-growing newer brand. For either brand, WA Battery Scheme eligibility comes from the system's Synergy SSL listing, with up to $1,300 off an eligible battery.
Sources: CEC register · Synergy SSL register · WA Battery Scheme
| Topic | Fox ESS | Sigenergy |
|---|---|---|
| Tends to suit | Value-focused buyers who want modular storage with a wide range of capacity options, and are comfortable with a newer but growing brand. | Buyers who prioritise power output, three-phase or whole-home backup, and an all-in-one stack, and are comfortable with a fast-growing newer brand. |
| WA rebate | Eligible for the WA Residential Battery Scheme rebate (up to $1,300) when installed with a Synergy SSL-approved inverter — confirm the exact system with your installer. | Check the specific SigenStor configuration against Synergy's Supported Solutions List for WA-rebate eligibility — your installer can confirm. |
| How it's built | Modular high-voltage stackable storage (the ECS, EQ and newer CQ ranges) that pairs with a Fox ESS hybrid inverter. | Modular DC-coupled 'tower' (SigenStor) that integrates the hybrid inverter and stackable battery modules, with strong three-phase and backup options at higher configurations. |
| Origin | Chinese-made — a fast-growing global inverter-and-storage brand with an expanding Australian footprint. | Chinese-made — a newer but rapidly-growing brand that has gained strong traction in the Perth market. |
Specifications, pricing and eligibility change over time — always confirm the current details with your installer.
A value option with an unusually broad capacity range, from compact residential stacks to very large-capacity systems.
A rising challenger known for high-power, flexible SigenStor systems that combine inverter, battery and (optionally) EV charging in one stack.
Australian support: Has an Australian office and is regarded as well-supported locally.
Strengths
Fox ESS
Sigenergy
Things to weigh
Fox ESS
Sigenergy
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Both systems sit in the desk's index of solar batteries for Perth — every CEC-approved model on the same comparable dataset.
Two modular systems Perth buyers often shortlist together, compared spec by spec.
Retrofit vs new install, efficiency trade-offs, and which brands use each type.
A 10 kWh usable LFP tower that stacks in 5 kWh modules, with a 10-year warranty.
The two all-in-one towers on Synergy's list, compared on backup, warranty terms and EV charging.
See annual savings and payback for your system, on current Synergy rates and WA rebates.
On sale here, but not on the approved-product register, so it earns no rebate.