Battery brands and comparisons
Fox ESS batteries: EQ, EP and Power Cube sizes, warranty and VPPs (2026)
The short answer
High-voltage batteries for Fox ESS hybrid inverters (H1 G2 and KH single-phase, H3 three-phase), and the Power Cube, an all-in-one with the inverter and battery modules together. Sizes: EQ4800: 9.3 to 41.9 kWh in 4.66 kWh modules. EQ5500: 10.9 to 49.1 kWh in 5.46 kWh modules. EP11 and EP12 Plus: 10.4 and 11.5 kWh units, up to 4 in parallel. The warranty is 10 years; at least 70% of capacity at 10 years or a throughput limit, whichever comes first. It's on the approved list for the federal battery rebate (about $3,663 on 15 kWh if installed now), and Amber SmartShift, Origin (Loop), ENGIE VPP and GloBird ZEROHERO VPP list it. Facts from Fox ESS's Australian datasheets and warranty, checked 15 October 2026.
What the Fox ESS EQ and EP batteries, and the Power Cube is
High-voltage batteries for Fox ESS hybrid inverters (H1 G2 and KH single-phase, H3 three-phase), and the Power Cube, an all-in-one with the inverter and battery modules together. It's imported and supported in Australia by FoxESS Australia Pty Ltd (Springvale, VIC).
Sizes and power
| Sizes | EQ4800: 9.3 to 41.9 kWh in 4.66 kWh modules. EQ5500: 10.9 to 49.1 kWh in 5.46 kWh modules. EP11 and EP12 Plus: 10.4 and 11.5 kWh units, up to 4 in parallel. |
|---|---|
| Modules | EQ4800 4.66 kWh, EQ5500 5.46 kWh, EP11 10.36 kWh, EP12 Plus 11.52 kWh |
| Phases | Single-phase H1 G2 (3–6 kW) and KH (7–10.5 kW); three-phase H3 Smart (5–15 kW) and H3 Pro (15–29.9 kW). Power Cube PQ1 single-phase (5–12 kW) and PQ3 three-phase (5–15 kW). |
| Power | Set by the inverter; the EQ stacks themselves run from about 4.5 kW (2 modules) to 20 kW (9 modules). |
| Build | LFP, IP65 (EQ and EP batteries), indoor or outdoor; charges from 0 °C and discharges from −10 °C, up to 55 °C. |
Can you add a Fox ESS battery to existing solar?
For homes with solar already, Fox sells the AC1 G2, an AC-coupled battery inverter (3 to 6 kW). See adding a battery to existing solar.
How does Fox ESS blackout backup work?
The inverters back up to their rated power; the Power Cube has a built-in 63 A bypass for whole-home backup, and three-phase H3 systems use the separate EPS Box Pro.
What warranty does a Fox ESS battery have?
The Fox ESS battery warranty is 10 years; at least 70% of capacity at 10 years or a throughput limit, whichever comes first.
- Throughput limit: about 4.2 MWh per kWh for the EQ batteries and about 3.7 MWh per kWh for the EP batteries.
- The battery must be registered and connected to Fox's warranty portal when it's commissioned.
- Claims go through your installer.
Source: Fox ESS HV Battery Warranty Policy (Australia and NZ), V2.7, 28 March 2026. Warranty terms change; the version that applies is the one on the day your battery is installed.
Which virtual power plants work with Fox ESS?
| VPP | Fox ESS |
|---|---|
| Amber SmartShift | Beta |
| AGL VPP | Not listed |
| Origin (Loop) | Yes |
| ENGIE VPP | Yes |
| GloBird ZEROHERO VPP | Yes |
- Amber SmartShift supports the H1 G2, KH and H3 Smart in beta.
- Origin lists the H1, AC1, KH, KA and H3 inverters with the EQ4800, EP5, EP11, CQ6 and CQ7 batteries.
- Western Australia: On Synergy's list as provisional (not yet ready for its VPP) on 1 October 2026.
A VPP list changes often, so check with the provider before you choose. What VPPs pay and the trade-offs: virtual power plants · Sigenergy vs Sungrow · home batteries compared · which batteries work with which VPP.
How much is the battery rebate on a Fox ESS battery?
The federal battery rebate on a Fox ESS battery depends on its usable size and the installation date: it's the same for every approved brand of the same usable size. The EQ4800, EQ5500, EP11 and EP12 Plus are on the Clean Energy Council approved list.
| Usable size | Installed now | From 1 January 2027 |
|---|---|---|
| 10 kWh | $2,516 | $2,109 |
| 15 kWh | $3,663 | $3,071 |
| 20 kWh | $4,403 | $3,700 |
| 30 kWh | $5,698 | $4,773 |
Estimates at an STC value of $37. More: the solar battery rebate.
How much does a Fox ESS battery cost?
A Fox ESS battery's price depends on the size, the inverter and your home more than the badge. Across brands, most homes pay about $700 to $850 per kWh installed after the federal rebate (October 2026); large modular batteries can be lower. See solar battery cost, or get a price for your home.
Who it suits, and what to check
It suits:
- Large batteries from small modules: EQ stacks reach about 42 to 49 kWh
- Three-phase homes, with inverters up to 29.9 kW
- Adding a battery to existing solar with Fox's AC-coupled inverter
- Joining Origin, ENGIE or GloBird's VPPs
Check before you buy:
- Registration on Fox's warranty portal at commissioning
- Which inverter caps your battery power
- AGL's VPP didn't list Fox ESS when we checked
No battery is right for every home. How to compare any two: how to choose a home battery.
Questions people ask
Is Fox ESS a good battery?
It depends what you need. The Fox ESS EQ and EP batteries, and the Power Cube suits large batteries from small modules: EQ stacks reach about 42 to 49 kWh. Before you buy, check: registration on Fox's warranty portal at commissioning.
How much does a Fox ESS battery cost?
Most home batteries cost about $700 to $850 per kWh installed after the federal rebate (October 2026). Your price depends on the size, the inverter and your home.
What warranty does a Fox ESS battery have?
10 years; at least 70% of capacity at 10 years or a throughput limit, whichever comes first.
Does Fox ESS work with Amber?
In beta: Amber SmartShift supports Fox ESS as a beta brand (checked 15 October 2026).
Does a Fox ESS battery get the battery rebate?
The EQ4800, EQ5500, EP11 and EP12 Plus are on the Clean Energy Council approved list. The rebate is about $3,663 on a 15 kWh battery if installed now.
Sources
- Fox ESS: batteries (Australia)
- Fox ESS: EQ4800 datasheet AU V1.3 (Aug 2026)
- Fox ESS: AU battery warranty V2.7 (Mar 2026)
- Fox ESS: all-in-one Power Cube
- Amber SmartShift: compatible batteries
- AGL VPP: compatible batteries
- Origin (Loop): compatible batteries
- ENGIE VPP: compatible batteries
- GloBird ZEROHERO VPP: compatible batteries
- DCCEEW: Cheaper Home Batteries eligibility
- Clean Energy Council: approved batteries
General information, not financial advice. Rebate rules change: figures on this page come from our rules table, last verified 26 September 2026. How we're paid: installers pay Homerise for introducing you. No brand or installer pays to be mentioned in a guide.