Fox ESS Battery

Fox ESS Batteries Score 3.4 out of 5

Scoring is based on our solar battery scorecard, which is consistently applied to each brand and battery available on the Australian market. This scoring reflects Fox ESS’s residential battery systems including the EQ, EP and CQ6 series.

Price: Based on data from our network of solar installers, the average price for an installed EQ and EP series Fox ESS battery is approximately $832 per usable kWh making it one of the lowest-cost options available in Australia. CQ6 is new to the market so we will update this figure once we have enough CQ6 installs and quotes to report a reliable average.

• Company Backing and Trustworthiness (3 out of 5): Fox ESS entered the Australian market around 2020 and launched its first CEC-approved battery in 2022. It has since expanded beyond batteries, selling inverters locally from 2022 and introducing EV chargers in 2024. Fox ESS also has a Victorian office in Springvale, Melbourne, with a growing local support team now spread across all major Australian cities.
• Warranty Offer (3.5 out of 5): Fox ESS offers a 10-year product and performance warranty on the EP11 and EQ series, and a 12-year product and performance warranty on the newer CQ6 series. Performance cover is typically limited by either a minimum 70% end-of-warranty capacity or a minimum energy throughput limit whichever comes first.
• Customer Reviews (4 out of 5): Based on verified customer reviews, Fox ESS holds an average rating of 4.28 from 204 reviews on Solar Cost Guide’s independent platform. Mixed feedback from a smaller number of reviewers results in a slightly lower score despite a strong overall average.
• Functionality (3 out of 5): Fox ESS batteries are IP65-rated and modular, which suits many homes. However, they are primarily DC-coupled, meaning you typically need a compatible Fox ESS hybrid inverter retrofitting to an existing non-Fox system can add complexity and cost. The EQ and EP series lack built-in fire suppression, while the newer CQ6 improves safety with an integrated aerosol fire extinguishing module.

Overview of Fox ESS — Company History

Fox ESS is a Chinese energy technology manufacturer that began selling solar inverters in Australia in 2022 and introduced EV chargers locally in 2024. While the company’s solar battery range remains relatively new in the Australian market, it has rapidly expanded its local product portfolio to include hybrid inverters, EV charging solutions, and more recently, heat pumps.

The company is a subsidiary of Tsingshan Group, one of the largest stainless steel and metallurgical companies in the world, with annual revenue in the tens of billions. Tsingshan also owns a sister company called REPT, which manufactures the lithium battery cells used inside Fox ESS products. This makes Fox ESS a genuine end-to-end manufacturer from raw lithium mining all the way through to the completed battery system, a structure that helps underpin their competitive pricing.

Fox ESS first launched an Australian subsidiary in 2020, initially focused on solar inverter sales. Their first battery received Clean Energy Council (CEC) approval in 2022, making them a relatively recent entrant to the energy storage market here. Fox ESS has since listed their local office at 53 Willow Avenue, Springvale VIC 3171, and in late 2025 they significantly expanded local operations building a dedicated team of 40 people for warehousing and sales and a 25-person technical support team, with engineers now stationed in Melbourne, Sydney, Brisbane, Adelaide, and Perth.

Fox ESS has also received notable industry recognition, being added to the BNEF Global Tier 1 Energy Storage Manufacturers list in Q4 2024, and achieving a record 97% System Performance Index (SPI) in independent testing by HTW Berlin (University of Applied Sciences) in 2026 one of the highest scores on record.

Fox ESS Battery Range and Options

Fox ESS provides a range of high-voltage, stackable lithium iron phosphate (LiFePO4) battery systems under the EQ, EP and CQ6 series all approved by the Clean Energy Council (CEC) for use in Australia. These batteries are designed to integrate with Fox ESS hybrid inverters, although some limited compatibility with third-party inverter systems exists. Customers are advised to confirm third-party compatibility with their installer before purchase.

EQ Series — DC-Coupled, Modular Stack

The EQ series is Fox ESS’s primary residential high-voltage modular battery platform. Each system consists of a control module (CM) and between 2 and 9 battery modules, each with a capacity of 4.66 kWh. This allows the system to scale up to just under 42 kWh in a single stack — one of the largest single-stack capacities available at this price point in Australia.

• DC-Coupled: Must be paired with a compatible Fox ESS hybrid inverter
• Depth of Discharge: 100%
• Ingress Protection: IP65 — suitable for indoor or sheltered outdoor installation
• Cooling: Natural convection (fan-free, completely silent operation)
• CEC Approved: Yes (November 2024)

Expansion is technically possible after initial installation, but Fox ESS’s warranty documentation requires new modules to be within 0.5V of existing modules and recharged within the past 5 months. This makes post-installation expansion feasible but logistically complex. For most homeowners, it is advisable to install your full intended capacity upfront particularly while the federal battery rebate remains at its current level before May 2026.

EP Series — DC-Coupled, Fixed Wall Units

The EP series includes fixed-capacity wall-mounted batteries that combine battery modules and the battery management system (BMS) in a single enclosure — a simpler, more space-saving option compared to the EQ stack for certain installation scenarios.

• Key model: EP11 — 10.36 kWh usable capacity
• DC-Coupled: Requires a compatible Fox ESS hybrid inverter
• Depth of Discharge: 100%
• Operating Range: -10°C to +55°C

The EP series is expandable by adding additional units in parallel, which requires an additional junction box and extra wiring. This is a more costly and space-consuming approach than the EQ series, but may suit certain homes particularly where wall space is available but floor space is limited. Fox ESS batteries are most straightforward to install when adding solar and battery together for the first time, rather than retrofitting to an existing system with a different brand inverter.

CQ6 Series — Fox ESS’s Latest and Most Advanced Battery (Launched 2026)

Fox ESS launched the CQ6 high-voltage modular battery in Australia in January 2026, their highest-specification residential solution to date. It uses larger 5.99 kWh modules and is configurable from 2 to 14 modules per stack, making it suitable for a wide range of household sizes right through to small commercial applications.

Key highlights of the CQ6 series:

• Scalability: Up to 83.86 kWh per stack. Fox ESS also states up to three stacks in parallel (up to 251.58 kWh) when paired with the H3 Pro inverter suitable for larger homes or small commercial sites
• Safety: Built-in aerosol fire extinguishing module, thermally activated at 170°C a meaningful safety improvement over the EQ and EP series
• Efficiency and DoD: Fox ESS claims greater than 95% round-trip efficiency and 100% depth of discharge. Note that some Fox ESS documentation states 90% DoD buyers should confirm the applicable figure on their installer’s final Australian datasheet before purchase
• Warranty: 12 years product and performance — one of the longest residential battery warranties available in Australia at this price point
• IP Rating: IP65 suitable for both indoor and outdoor installation
• Compatible inverters: Single-phase Fox ESS hybrid inverters up to 10.5 kW, and three-phase inverters up to 30 kW

As the CQ6 is still relatively new to the Australian market, long-term real-world field data is limited. Pricing is also still emerging see the cost section below for current indicative figures.

How Much Does a Fox ESS Battery Cost?

Fox ESS batteries are among the most competitively priced options on the Australian market. Based on data from our installer network, the average installed cost for EQ and EP series batteries is approximately $832 per usable kWh, excluding government rebates.

For example:

• A 10.36 kWh EP11 system typically costs $8,650–$9,200 installed
• An 18.64 kWh EQ4800 stack (4 modules) might cost $15,000–$16,000 installed
• A full 41.93 kWh EQ4800 stack (9 modules) is available from approximately $6,299 installed in Victoria after applicable federal rebates
• A 23.9 kWh CQ6 package has been publicly advertised at approximately $8,500–$9,000 installed after rebates, including DC-coupled installation though pricing is still emerging as the product is new to market
• A CQ6 47.92 kWh bundle with Smart Pro Inverter is available from approximately $9,549 after rebates in VIC, NSW, QLD and WA

Because Fox ESS batteries are DC-coupled, homeowners will also need to purchase a compatible Fox ESS hybrid inverter if one is not already installed. This cost is typically included in full system quotes when installing solar and battery together, but should be factored in separately for retrofits. Pricing varies by state, installer, system size, site conditions, and any required switchboard upgrades. Always obtain at least three quotes from CEC-accredited installers before committing.

Federal Battery Rebate — Cheaper Home Batteries Program (from 1 July 2025)

From 1 July 2025, eligible on-grid batteries installed with solar can receive an upfront discount via Small-scale Technology Certificates (STCs) under the Australian Government’s Cheaper Home Batteries Program. Key points Australian buyers need to know:

• Rebate value is approximately $320–$372 per usable kWh on the first 50 kWh of installed capacity
• The discount is applied directly to your invoice by an approved installer — no separate claim process required
• Fox ESS EQ4800 and EP11 batteries were specifically engineered to align with Australia’s 50 kWh rebate cap
• A full 41.93 kWh EQ4800 system currently attracts approximately $13,000–$13,800 in rebate value
• A Tesla Powerwall 3 (13.5 kWh) attracts approximately $4,600 in rebate value — illustrating how much more valuable the rebate is for larger-capacity Fox ESS systems

Important — Rebate Change from 1 May 2026: From 1 May 2026, the rebate structure is expected to shift to a tiered model that significantly reduces benefits for larger systems. A 28 kWh+ system would attract approximately 15% under the new structure rather than the current ~30% — effectively halving the rebate on large battery systems. The system must be physically installed and commissioned before this date to lock in current rates. A booking or deposit alone is not sufficient.

State rebates:

• NSW: VPP (Virtual Power Plant) incentives are available and can be stacked on top of the federal discount
• Victoria: Solar Victoria’s interest-free battery loan program has closed. Victorians access the federal discount only
• Western Australia: Additional state-based battery rebate available alongside the federal discount ($1,300–$3,800 depending on system)
• ACT and Tasmania: Interest-free loan programs are available for eligible residents

For details and calculations, visit our Australian Government Battery Rebate guide and battery rebate calculator.

Fox ESS Warranty for Australian Customers

Fox ESS battery warranties operate with two simultaneous limits running at the same time — understanding both is essential before purchase.

1. Time Limit (Years): How long the warranty lasts 10 years for EQ and EP series, 12 years for the CQ6 series.

2. Usage Limit (Energy Throughput): How much total energy the battery is allowed to cycle in and out over its lifetime. Think of this like a kilometre limit on a car warranty — if you cycle the battery very heavily every day, you can hit the usage limit before the years are up.

The performance warranty is written as “70% capacity or throughput, whichever comes first” — meaning the warranty ends when either the battery drops below 70% of its original usable capacity, or the battery has delivered its minimum warranted energy throughput.

Product Series	Warranty Term	Nominal Energy (kWh)	Min. Throughput (MWh)	Throughput per kWh
EQ4800	10 years	10.36	38.4	~4.22 MWh/kWh
EP11	10 years	18.64	78.64	~3.71 MWh/kWh
CQ6	12 years	Varies by stack	Varies by stack	~5.04 MWh/kWh

CQ6 Throughput Examples by Stack Size (12-Year Warranty):

CQ6 Configuration	Nominal Energy (kWh)	Min. Energy Throughput (MWh)
CQ6-L2 (2 modules)	11.96	60.28
CQ6-L4 (4 modules)	23.92	120.56
CQ6-L8 (8 modules)	47.84	241.12
CQ6-L14 (14 modules)	83.72	421.96

Fox ESS warranty terms include standard exclusions such as improper installation or use. Product registration should be completed within 6 weeks of installation and no later than 36 months from manufacture. Some Fox ESS battery models require periodic inspections from year 6 onward to maintain full warranty coverage, confirm this with your installer at handover and retain all documentation. An optional FoxPlus extended warranty can extend inverter coverage to up to 20 years for an additional fee.

Fox ESS Battery Technical Specifications

Feature	EQ4800 L4 (18.64 kWh)	EP11 (10.36 kWh)	CQ6 (Modular)
Battery Chemistry	LiFePO4	LiFePO4	LiFePO4
Usable Capacity	18.64 kWh (4 modules)	10.36 kWh	11.98–83.86 kWh (L2–L14 per stack)
Max Stack Capacity	41.93 kWh (9 modules)	Expandable in parallel	83.86 kWh per stack
Depth of Discharge	100%	100%	100% (confirm per AU datasheet)
Round-Trip Efficiency	>95%	>95%	>95%
IP Rating	IP65	IP65	IP65
Fire Suppression	No	No	Yes — aerosol module at 170°C
Cooling Method	Natural convection	Natural convection	Natural convection
Cycle Life	6,000+ cycles	6,000+ cycles	6,000+ cycles
Operating Temperature	-10°C to +55°C	-10°C to +55°C	Charge: 0–55°C / Discharge: -10–55°C
Inverter Coupling	DC-coupled (Fox hybrid required)	DC-coupled (Fox hybrid required)	DC-coupled (Fox hybrid required)
Installation	Floor-mounted, stackable	Wall or floor mounted	Floor-mounted, indoor/outdoor
Min. Throughput	4.22 MWh/kWh	3.71 MWh/kWh	~5.04 MWh/kWh
Max Single-Phase Inverter	Up to 10.5 kW	Up to 10.5 kW	Up to 10.5 kW
Max Three-Phase Inverter	Up to 15 kW (H3 Smart)	Up to 15 kW	Up to 30 kW (H3 Pro)
CEC Approved	Yes	Yes	Yes
Monitoring	FoxCloud app (iOS/Android), web portal, Home Assistant integration	Same	Same

Pros and Cons of Fox ESS Batteries

Pros:

• Competitive installed pricing — often under $850/kWh installed on EQ and EP series
• IP65 weatherproofing on all series, suitable for Australian climate extremes
• Modular and highly scalable — EQ up to 42 kWh, CQ6 up to 84 kWh per stack
• LiFePO4 chemistry — the safest and most thermally stable lithium battery type
• CQ6 adds built-in aerosol fire suppression module
• CQ6 carries a 12-year warranty — among the longest available at this price
• BNEF Global Tier 1 manufacturer status (Q4 2024)
• Record 97% System Performance Index from HTW Berlin independent testing (2026)
• FoxCloud app with iOS, Android and Home Assistant integration
• Local Melbourne office with engineers across all major Australian cities
• Growing AU team of 40 sales/warehouse staff and 25 technical support staff
• All models eligible for the federal Cheaper Home Batteries Program rebate
• End-to-end manufacturer — vertical integration from raw material to finished battery

Cons:

• Relatively new to Australia — limited long-term local track record (market entry 2020)
• CQ6 is still very new — insufficient long-term Australian field data yet available
• Primarily DC-coupled and Fox ESS ecosystem-dependent — a compatible Fox hybrid inverter is required
• Post-installation expansion is logistically complex due to module matching voltage requirements
• EQ and EP series lack built-in fire suppression hardware
• Some models require periodic inspections from year 6 to maintain warranty coverage
• Customer reviews show a notable minority of negative experiences despite a solid average rating
• Battery management system begins to slow charging above approximately 45°C — relevant for homeowners in hot climates such as WA, QLD, and western NSW

Our Verdict on Fox ESS Batteries

Fox ESS is a relatively new entrant to the Australian market and has adopted an aggressive pricing strategy to win market share and it is clearly working. If keeping upfront costs down is your primary concern, Fox ESS EQ and EP series batteries are among the most competitive options available, with average installed costs often under $850 per usable kWh before government rebates are applied.

Their EQ and EP series are scalable to over 40 kWh and pair with an expanded range of single and three-phase hybrid inverters. Warranty terms compare favourably to many brands at this price point particularly on the energy throughput guarantee. The new CQ6 series represents Fox ESS’s most significant step forward yet: larger 5.99 kWh modules, a 12-year warranty, built-in aerosol fire suppression, and capacity that scales up to 84 kWh per stack.

The key trade-off is that Fox ESS batteries are DC-coupled and inverter-ecosystem-dependent. You will generally need a compatible Fox ESS hybrid inverter, which is seamless when installing solar and battery together for the first time, but can add meaningful cost when retrofitting to an existing system with a different inverter brand. The short Australian track record also remains a genuine consideration for buyers who prioritise long-term brand certainty over upfront savings.

With the Cheaper Home Batteries Program now in place and with changes expected from 1 May 2026 that will reduce rebate value on larger systems there is a genuine financial case for installing a large-capacity Fox ESS system before that deadline.

The bottom line: Fox ESS is a solid, well-priced choice for value-conscious Australian homeowners installing a new solar and battery system in 2025. As always, obtain at least three quotes from CEC-accredited installers, confirm your exact model’s Australian datasheet specifications and warranty conditions, and ask your installer specifically about their Fox ESS experience before signing.

————————————————————

Fox ESS Battery Review Australia 2025 | Solar Cost Guide

Fox ESS battery review for Australian homeowners. Compare EQ4800, EP11 & CQ6 specs, installed prices from $832/kWh, warranty details, rebate eligibility & real customer reviews. Updated March 2025.