If you’re shopping for a home battery in 2026, two names keep coming up in quotes: the Fox ESS CQ7 and the GoodWe ESA. This Fox ESS CQ7 vs GoodWe ESA comparison looks at how the two systems differ in capacity, power, design, backup, warranty and installation, so you can work out which one suits your home before you sign a quote.
Both are lithium iron phosphate (LFP) batteries from established manufacturers with a strong presence in Australia, and both are modular, so you can start with one size and add capacity later. The biggest difference is how they’re built: the CQ7 is a high-voltage battery stack that pairs with a separate Fox ESS hybrid inverter, while the ESA is an all-in-one system with the inverter and battery modules designed as a single unit.
Fox ESS CQ7 vs GoodWe ESA at a glance
The table below compares the key specifications published in each manufacturer’s datasheets for the single-phase residential versions most Australian homes would consider.
| Feature | Fox ESS CQ7 | GoodWe ESA (single phase) |
|---|---|---|
| System type | High-voltage battery stack, paired with a Fox ESS hybrid inverter | All-in-one: hybrid inverter and battery modules in one stack |
| Battery chemistry | LFP | LFP |
| Module size | 6.96 kWh per module | 5 kWh or 8 kWh usable modules (Australian range) |
| Capacity range | 13.92 kWh (2 modules) to 97.44 kWh (14 modules) | From 5 kWh, up to around 48 kWh per stack |
| Depth of discharge | 100% (nominal energy equals usable energy) | Usable capacity quoted per module |
| Inverter power | Set by the paired Fox inverter (e.g. H1 3–6 kW, KH 7–10.5 kW) | 3, 3.6, 5, 6, 8 or 10 kW |
| Backup | Via the paired Fox ESS hybrid inverter | Built-in, under 4 ms switchover, up to 63 A whole-home bypass |
| Ingress rating | IP65 | IP66 |
| Cooling | Natural convection (no fans) | Natural convection (fanless) |
| Battery warranty | 10 years, 70% retained energy (or throughput limit) | 10 years product and performance (check current GoodWe terms) |
Capacity and scalability
Fox ESS CQ7
The CQ7 is built from 6.96 kWh modules stacked in series. Each system has one master module (CQ7-M) plus up to 13 slave modules (CQ7-S), giving a range from 13.92 kWh with two modules up to 97.44 kWh with fourteen. Fox ESS rates the CQ7 at 100% depth of discharge, so the nominal and usable figures are the same.
In practice, how many modules you can fit depends on which Fox ESS inverter it’s paired with. Fox’s compatibility list allows fewer modules on its smaller single-phase H1 inverters than on the larger KH and three-phase H3 series, so the inverter choice sets your upgrade ceiling. The CQ7 starts at roughly 14 kWh, which makes it a better fit for households that already know they want a mid-sized or larger battery.
GoodWe ESA
The ESA uses 5 kWh or 8 kWh usable modules in Australia, and GoodWe says old and new modules can be mixed, which makes it simple to start small and add more later. A single-phase stack tops out at around 48 kWh, and the three-phase version scales higher still. Because it can start at a single 5 kWh module, the ESA gives you a lower entry point if your evening usage is modest.
Power output and all-in-one design
Capacity tells you how much energy a battery holds; power tells you how much it can deliver at once. This is where the two designs differ most.
Fox ESS CQ7: the battery itself supports a maximum charge and discharge current of 80 A, but the real-world power your home gets is limited by the paired inverter. A Fox KH inverter covers 7 to 10.5 kW and suits most larger single-phase homes, while the H1 series covers 3 to 6 kW. Three-phase homes can use the H3 range. The upside of a separate inverter is flexibility: your installer can match the inverter to your solar array and switchboard, and size the battery independently.
GoodWe ESA: the inverter is built into the stack, available from 3 kW to 10 kW in single phase. GoodWe’s datasheet lists a maximum PV input of up to 200% of the inverter rating, two to four MPPTs depending on model, and a combined footprint of 800 mm wide. The all-in-one approach means fewer separate boxes on the wall, tidier cabling and one brand responsible for the whole system. GoodWe also quotes low operating noise (around 30–35 dB) thanks to fanless cooling.
Backup capability during blackouts
Both systems can provide backup power, but how it works differs.
- GoodWe ESA: backup is integrated. GoodWe quotes a switchover of under 4 milliseconds (UPS-level) and an internal bypass of up to 63 A, allowing whole-home backup without extra hardware, subject to the inverter’s backup power rating and your switchboard design.
- Fox ESS CQ7: backup is handled by the Fox ESS hybrid inverter it’s paired with. Backup output, switchover behaviour and whether you back up the whole home or selected circuits depend on that inverter and how your installer wires the backup circuits.
Warranty and durability
Fox ESS’s Australian battery warranty covers the CQ7 for 10 years from installation, with the battery guaranteed to retain at least 70% of its energy over that period or until a minimum energy throughput is reached, whichever comes first. The battery must be registered and connected to Fox’s monitoring at commissioning for the warranty to apply.
The GoodWe ESA is commonly sold with a 10-year product warranty and a 10-year performance warranty based on retained energy or throughput. GoodWe’s datasheet lists cycle life of 8,000 cycles for its 5 kWh and 8 kWh modules. As always, check the current warranty document for your exact model before you buy.
On the environmental side, the CQ7 is rated IP65 and the ESA IP66, so both can be installed indoors or outdoors in suitable locations. The CQ7 has an optional warm-up version (marked “w”) for colder climates, which extends charging down to -25°C.
Compatibility with existing solar
Neither system is a simple “bolt-on” for any existing inverter. The CQ7 is a high-voltage battery that only works with compatible Fox ESS hybrid inverters, so if you have an older string inverter from another brand, your installer may recommend replacing it with a Fox hybrid or adding one alongside. The ESA includes its own hybrid inverter, so in most retrofits your existing panels are connected to the ESA, and the old inverter is either retired or kept on an AC-coupled arrangement where the design allows.
Either way, a site inspection is the best way to check your array size, roof layout, export limits and switchboard capacity before you commit.
Installation considerations
- Weight and floor space: CQ7 modules are floor-stacked, and a 14-module stack is about 2.3 m tall and over 700 kg, so larger systems need a solid, level location. A two-module CQ7 weighs about 105 kg.
- Wall or floor: the ESA can be wall- or floor-mounted, with a combined inverter and battery stack that’s 800 mm wide.
- Location: both are outdoor-rated, but placement must still comply with Australian battery installation standards.
- Switchboard: adding backup circuits often requires switchboard work. Older boards may need an upgrade first.
Cheaper Home Batteries program eligibility
The federal Cheaper Home Batteries program provides an upfront discount on eligible batteries installed with new or existing solar, delivered through small-scale technology certificates (STCs). To qualify, the battery must be on the Clean Energy Council’s approved product list, be installed by an accredited installer, and be capable of joining a virtual power plant (VPP).
From 1 May 2026 the program changed: the discount now tapers as battery size increases, with the full rate applied to the first portion of usable capacity and reduced rates on larger bands, and the discount continues to step down over time. That means very large batteries attract proportionally less support per kWh than they did in 2025. GoodWe states that the ESA is eligible for the program, and the CQ7 is widely offered with the discount by Australian installers. Your installer should confirm the specific model is on the approved list on the day of installation and show the discount clearly on your quote.
Which battery suits which household?
The Fox ESS CQ7 may suit you if…
- You want a mid-to-large battery (around 14 kWh or more) from day one.
- You expect to add a lot of capacity later, for example for an EV, pool or full electrification.
- You’re already planning a Fox ESS hybrid inverter, or want to choose inverter size independently of battery size.
- You have a three-phase home or a large energy load that suits Fox’s H3 range.
The GoodWe ESA may suit you if…
- You want a tidy all-in-one system with one brand covering the inverter and battery.
- You’d like to start smaller (from 5 kWh) and add modules as your needs grow.
- Fast, whole-home backup with minimal extra hardware is a priority.
- Quiet operation matters because the system will be near living areas.
For many homes, either battery will do the job well. The right choice usually comes down to your existing solar, your switchboard, how much backup you need, and the installed price after the rebate.
Fox ESS CQ7 vs GoodWe ESA: FAQs
Can I add more modules later?
Yes. Both are modular. The CQ7 adds 6.96 kWh modules up to the limit allowed by your Fox inverter, and the ESA adds 5 kWh or 8 kWh modules up to its stack limit. Expansion may affect your rebate, so ask your installer before adding capacity.
Will either battery work with my current inverter?
The CQ7 needs a compatible Fox ESS hybrid inverter. The ESA has its own built-in inverter. In both cases your existing solar can usually be reused, but the inverter arrangement may change.
Which has better backup?
The ESA has backup built in with a published switchover of under 4 ms. CQ7 backup depends on the Fox inverter it’s paired with. In both cases, backup power is limited by inverter rating, not battery size.
Are both eligible for the battery rebate?
Both are offered with the federal Cheaper Home Batteries discount, provided the exact model is CEC-approved and installed by an accredited installer. Some states also offer extra incentives, so check what applies where you live.
Get a Fox ESS or GoodWe battery quote from Sunloop Energy
Still weighing up the Fox ESS CQ7 vs GoodWe ESA? Sunloop Energy can review your power bills, solar system and switchboard, then recommend the battery size and setup that fits your home and budget, with any Cheaper Home Batteries discount shown upfront. Request a free quote from Sunloop Energy today and get clear, side-by-side pricing for both options.
