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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
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.
Origin
Chinese-made — a fast-growing global inverter-and-storage brand with an expanding Australian footprint.
Architecture
Modular high-voltage stackable storage (the ECS, EQ and newer CQ ranges) that pairs with a Fox ESS hybrid inverter.
Strengths
Things to weigh
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.
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.
A rising challenger known for high-power, flexible SigenStor systems that combine inverter, battery and (optionally) EV charging in one stack.
Origin
Chinese-made — a newer but rapidly-growing brand that has gained strong traction in the Perth market.
Architecture
Modular DC-coupled 'tower' (SigenStor) that integrates the hybrid inverter and stackable battery modules, with strong three-phase and backup options at higher configurations.
Strengths
Things to weigh
Australian support
Has an Australian office and is regarded as well-supported locally.
WA rebate
Check the specific SigenStor configuration against Synergy's Supported Solutions List for WA-rebate eligibility — your installer can confirm.
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.
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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.
Not sold here and not on the approved-product register, so it earns no rebate.