Fox ESS CQ7 14.04–98.28kWh High Voltage Solar Battery System
- Size your storage from 14.04kWh to 98.28kWh using CQ7 7.02kWh battery modules connected in series.
- Store energy for later use with LFP battery chemistry, 90% depth of discharge and over 95% battery-pack round-trip efficiency under specified test conditions.
- Floor-standing, IP65-rated system for suitable indoor or sheltered outdoor installations, with CAN communication.
Fox ESS CQ7 solar battery storage
The Fox ESS CQ7 High Voltage Solar Battery System provides modular storage for a correctly matched inverter installation. Each system combines one CQ7-M-80 master module, which includes the controller and a battery module, with matching CQ7-S-80 slave modules. Choose from 13 configurations, with 2–14 modules providing 14.04–98.28kWh of nominal storage. Final module quantity and output must be checked against the inverter’s approved battery configuration.
Key features
- Expandable series-connected design: one master module plus 1–13 matching slave modules.
- 50A recommended charge/discharge current, 80A maximum charge/discharge current and 110A peak discharge current for 60 seconds.
- CAN communication and LED indicators for system monitoring and status.
- Natural-convection cooling and an integrated fire-protection function.
- Optional warm-up versions support operation in colder conditions; heating is not included in standard modules.
Where to use
Suitable applications include solar energy storage at offices, workshops, warehouses and other commercial premises where a compatible inverter and approved battery configuration are specified. Storage can help shift solar energy to later operating hours; backup capability depends on the inverter, switching equipment and complete system design.
The CQ7 is a high-voltage DC battery, not a standalone AC power supply. Do not assume compatibility with every Fox ESS inverter or with third-party inverters. Contact our UK team to check the exact inverter model, module count, firmware and required connection equipment before ordering.
Installation and commissioning must be carried out by qualified electrical personnel. Provide a hard, level supporting surface, suitable ventilation and the clearances required by the manual. Outdoor installations must be protected from direct sunlight, rain and snow accumulation. We can suggest trusted installation partners for system design and commissioning.
Technical specifications
Specifications below apply to the CQ7-80 system in the Fox ESS datasheet V1.3 dated 26 May 2026. Capacities are nominal, not usable energy. Current capability depends on temperature, cell voltage, state of charge and the connected inverter.
| Electrical specification | Details |
|---|---|
| Manufacturer / product family | Fox ESS / CQ7 |
| Specified system variant | CQ7-80 |
| Battery chemistry | LiFePO₄, lithium iron phosphate |
| Nominal energy per module | 7.02kWh |
| Nominal system energy | 14.04–98.28kWh, depending on module quantity |
| Master module | 1 × CQ7-M-80 per system; includes system controller and battery module |
| Slave modules | 1–13 × CQ7-S-80 per system |
| Scalability | Maximum 14 modules connected in series; permitted quantity subject to inverter configuration |
| Nominal system voltage | 115.2–806.4V, depending on module quantity |
| Operating voltage envelope | 104.4–919.8V across the listed system configurations; not the operating range of every individual configuration |
| Recommended charge/discharge current | 50A |
| Maximum charge/discharge current | 80A; affected by temperature, cell voltage and state of charge |
| Peak discharge current | 110A for 60 seconds |
| Battery-pack round-trip efficiency | Greater than 95%, tested at 25°C and 0.3C charging/discharging |
| Depth of discharge | 90% |
| Communication | CAN |
| Display / indicators | CQ7-S-80: 1 LED; CQ7-M-80: 6 LEDs |
Battery configurations and dimensions
Every configuration uses one CQ7-M-80 master module. Dimensions are width × depth × height. System weight and cell net weight have a stated tolerance of ±5%.
| Configuration | Total modules | Slave modules | Nominal energy (kWh) | Nominal voltage (V) | Dimensions (mm) | System weight (kg) | Cell net weight (kg) |
|---|---|---|---|---|---|---|---|
| CQ7-80-L2 | 2 | 1 | 14.04 | 115.2 | 660 × 360 × 420 | 105.5 | 72.4 |
| CQ7-80-L3 | 3 | 2 | 21.06 | 172.8 | 660 × 360 × 575 | 156.0 | 108.5 |
| CQ7-80-L4 | 4 | 3 | 28.08 | 230.4 | 660 × 360 × 730 | 206.5 | 144.7 |
| CQ7-80-L5 | 5 | 4 | 35.10 | 288.0 | 660 × 360 × 885 | 257.0 | 180.9 |
| CQ7-80-L6 | 6 | 5 | 42.12 | 345.6 | 660 × 360 × 1040 | 307.5 | 217.1 |
| CQ7-80-L7 | 7 | 6 | 49.14 | 403.2 | 660 × 360 × 1195 | 358.0 | 253.3 |
| CQ7-80-L8 | 8 | 7 | 56.16 | 460.8 | 660 × 360 × 1350 | 408.5 | 289.4 |
| CQ7-80-L9 | 9 | 8 | 63.18 | 518.4 | 660 × 360 × 1505 | 459.0 | 325.6 |
| CQ7-80-L10 | 10 | 9 | 70.20 | 576.0 | 660 × 360 × 1660 | 509.5 | 361.8 |
| CQ7-80-L11 | 11 | 10 | 77.22 | 633.6 | 660 × 360 × 1815 | 560.0 | 398.0 |
| CQ7-80-L12 | 12 | 11 | 84.24 | 691.2 | 660 × 360 × 1970 | 610.5 | 434.2 |
| CQ7-80-L13 | 13 | 12 | 91.26 | 748.8 | 660 × 360 × 2125 | 661.0 | 470.3 |
| CQ7-80-L14 | 14 | 13 | 98.28 | 806.4 | 660 × 360 × 2280 | 711.5 | 506.5 |
Operating conditions and protection
| Specification | Details |
|---|---|
| Installation location | Indoor or outdoor, floor-standing; site protection requirements apply |
| Standard operating temperature — charging | 0°C to +55°C |
| Standard operating temperature — discharging | -10°C to +55°C |
| Optional warm-up version — charging | -25°C to +55°C with warm-up function enabled |
| Optional warm-up version — discharging | -25°C to +55°C with warm-up function enabled |
| Warm-up availability | Only modules with the “(w)” suffix include the warm-up function; all modules must be matching warm-up versions |
| Storage temperature | -10°C to +50°C |
| Cooling method | Natural convection |
| Humidity | 5–95%, non-condensing |
| Maximum altitude | 3,000m |
| Ingress protection | IP65 |
| Fire-protection function | Yes; integrated aerosol fire-protection module described in the CQ Series manual |
| Fire-protection activation method | Thermal activation |
| Fire-protection activation temperature | ≥170°C |
| Fire-protection discharge time | ≤5 seconds |
| Safety standard | IEC 62619 |
| EMC standards | IEC 61000-6-1 / IEC 61000-6-2 / IEC 61000-6-3 / IEC 61000-6-4 |
| Transportation testing | UN38.3 |
| Datasheet reference | Fox ESS CQ7-80, V1.3, 26 May 2026 |
The optional warm-up function heats the cells before normal charging or discharging can proceed. It does not mean standard, unheated modules can charge at -25°C. Heating consumes energy and must be configured during commissioning.
Shipping and UK expert support
Shipping is available to the UK, Ireland, Africa, the Caribbean and worldwide. If a shipping rate is not shown at checkout, contact us on +44 2080640335 or info@energian.co.uk for a quote.
UK expert support is available for battery sizing, inverter compatibility and support requests. Contact us by phone, email or live chat, or visit our office for an in-person consultation. We can suggest trusted installation partners for electrical design, installation and commissioning.