Fox ESS AIO EQ4000 – High-Voltage Scalable Battery Storage (3.97 kWh per module)
ONLY FOR AIO APPLICATION The EQ4000 is a high-performance, modular LiFePO4 battery system designed exclusively for Fox ESS All-in-One (AIO) inverters. With plug-and-play installation and industry-leading 90% DoD, it’s the perfect expandable storage solution for residential and light commercial solar systems.
Key Highlights
- 3.97 kWh usable capacity per module
- Scalable up to 27.80 kWh (max 7 modules in series)
- 90% Depth of Discharge (DoD)
- Wide operating temperature: -10°C to 55°C
- IP65-rated – indoor/outdoor (stand)
- CAN communication for seamless AIO integration
- High round-trip efficiency: >95%
- Natural convection cooling – silent & maintenance-free
Available Configurations
| Model | Battery Modules | Total Capacity | Nominal Voltage | Weight (kg/lbs) | Dimensions (W×H×D) |
|---|---|---|---|---|---|
| EQ4000-AL2 | 2 × CS4000 | 7.95 kWh | 115.2 V | 71.5 / 157.6 | 570×330×380 mm (22.4×13.0×15.0 in) |
| EQ4000-AL3 | 3 × CS4000 | 11.92 kWh | 172.8 V | 106.5 / 234.8 | 570×420×380 mm (22.4×16.5×15.0 in) |
| EQ4000-AL4 | 4 × CS4000 | 15.89 kWh | 230.4 V | 141.5 / 312.0 | 570×540×380 mm (22.4×21.3×15.0 in) |
| EQ4000-AL5 | 5 × CS4000 | 19.87 kWh | 288.0 V | 176.5 / 389.1 | 570×660×380 mm (22.4×26.0×15.0 in) |
Max 5 modules in series. Contact us for 6–7 module custom setups (up to 27.80 kWh).
Technical Specifications (Per Module)
- Battery Chemistry: LiFePO4 Prismatic Cell
- Max Charge/Discharge Current: 50 A
- Peak Discharge Current: 65 A @ 60 sec
- Operating Voltage Range: 97.2 – 328.5 V (system-dependent)
- Communication: CAN
- Cooling: Natural convection
- Installation: Indoor/Outdoor (stand)
- Operating Temp: –10°C to 55°C (14°F to 131°F)
- Storage Temp: –20°C to 55°C (–4°F to 131°F)
- Humidity: 0–100% (non-condensing)
- Max Altitude: 2,000 m (6,560 ft)
Certifications & Warranty
- Safety: UL1973, UL9540, UL9540A
- Transport: UN38.3
- Ingress Protection: IP65
- Warranty: Standard 12.5 years¹
¹ Refer to Fox ESS Battery Warranty Terms and Conditions.
Why Choose EQ4000?
- Easy “plug & play” installation – saves installer time
- Stackable modular design – grow your storage as needed
- High voltage (up to 459.9 V) – reduces cable losses
- Proven LiFePO4 safety – no thermal runaway risk
Your payment details are safe and secure. We accept the following:
Fox ESS AIO EQ4000 – High-Voltage Scalable Battery Storage (3.97 kWh per module)
ONLY FOR AIO APPLICATION The EQ4000 is a high-performance, modular LiFePO4 battery system designed exclusively for Fox ESS All-in-One (AIO) inverters. With plug-and-play installation and industry-leading 90% DoD, it’s the perfect expandable storage solution for residential and light commercial solar systems.
Key Highlights
- 3.97 kWh usable capacity per module
- Scalable up to 27.80 kWh (max 7 modules in series)
- 90% Depth of Discharge (DoD)
- Wide operating temperature: -10°C to 55°C
- IP65-rated – indoor/outdoor (stand)
- CAN communication for seamless AIO integration
- High round-trip efficiency: >95%
- Natural convection cooling – silent & maintenance-free
Available Configurations
| Model | Battery Modules | Total Capacity | Nominal Voltage | Weight (kg/lbs) | Dimensions (W×H×D) |
|---|---|---|---|---|---|
| EQ4000-AL2 | 2 × CS4000 | 7.95 kWh | 115.2 V | 71.5 / 157.6 | 570×330×380 mm (22.4×13.0×15.0 in) |
| EQ4000-AL3 | 3 × CS4000 | 11.92 kWh | 172.8 V | 106.5 / 234.8 | 570×420×380 mm (22.4×16.5×15.0 in) |
| EQ4000-AL4 | 4 × CS4000 | 15.89 kWh | 230.4 V | 141.5 / 312.0 | 570×540×380 mm (22.4×21.3×15.0 in) |
| EQ4000-AL5 | 5 × CS4000 | 19.87 kWh | 288.0 V | 176.5 / 389.1 | 570×660×380 mm (22.4×26.0×15.0 in) |
Max 5 modules in series. Contact us for 6–7 module custom setups (up to 27.80 kWh).
Technical Specifications (Per Module)
- Battery Chemistry: LiFePO4 Prismatic Cell
- Max Charge/Discharge Current: 50 A
- Peak Discharge Current: 65 A @ 60 sec
- Operating Voltage Range: 97.2 – 328.5 V (system-dependent)
- Communication: CAN
- Cooling: Natural convection
- Installation: Indoor/Outdoor (stand)
- Operating Temp: –10°C to 55°C (14°F to 131°F)
- Storage Temp: –20°C to 55°C (–4°F to 131°F)
- Humidity: 0–100% (non-condensing)
- Max Altitude: 2,000 m (6,560 ft)
Certifications & Warranty
- Safety: UL1973, UL9540, UL9540A
- Transport: UN38.3
- Ingress Protection: IP65
- Warranty: Standard 12.5 years¹
¹ Refer to Fox ESS Battery Warranty Terms and Conditions.
Why Choose EQ4000?
- Easy “plug & play” installation – saves installer time
- Stackable modular design – grow your storage as needed
- High voltage (up to 459.9 V) – reduces cable losses
- Proven LiFePO4 safety – no thermal runaway risk
Your payment details are safe and secure. We accept the following:
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