$2,222.32
Original: $6,349.49
-65%Fox ESS CQ7 High Voltage Battery Slave Module 7.02kWh—
$6,349.49
$2,222.32The Story
The Fox ESS CQ7 Slave (Part No: FE-CQ7-S) is the battery expansion module for the Fox ESS CQ7 high-voltage storage system, adding a further 7.02kWh of LiFePO₄ (LFP) capacity to any existing CQ7 stack. Unlike the Master module, the Slave contains battery cells only — no system controller — keeping each added module lighter and simpler to install. Slave modules are added one at a time in series with a single CQ7 Master (FE-CQ7-M, sold separately) to scale a stack from 14.04kWh up to a maximum of 98.28kWh.
7.02kWh
Module Capacity
57.6V
Nominal Voltage
80A
Max Charge/Discharge
90%
Depth of Discharge
>95%
Round-Trip Efficiency
IP65
Ingress Protection
Qualified Installation Required
High-voltage battery wiring must be carried out by a qualified, competent electrician in accordance with BS 7671 and Part P of the Building Regulations. Where the installation forms part of an MCS-certified renewable system, work must be completed by an MCS-accredited installer.
Requires a CQ7 Master to Operate
The CQ7 Slave is a battery-only expansion module and cannot function as a standalone system. Every stack must include exactly one CQ7 Master (FE-CQ7-M), sold separately, which provides the system controller, BMU and inverter communication that the whole stack relies on.
Plug-and-Play Capacity Expansion
Each Slave module simply stacks in series on top of the existing tower, adding 7.02kWh of usable LFP capacity per unit with no additional control electronics required. Up to 13 Slave modules can be combined with a single Master, taking total stack capacity as high as 98.28kWh.
Why It Performs
Pure Capacity Expansion
Adds 7.02kWh of LiFePO₄ capacity per module with no duplicate control electronics, keeping incremental expansion cost-efficient as a stack grows.
CAN Communication
Integrates into the stack's CAN bus, reporting cell-level data back to the Master module for accurate state-of-charge and balancing across the full tower.
Scalable Architecture
Up to 13 Slave modules can be installed in series with one Master, allowing installers to size a system precisely to the property's storage requirement.
Integrated Fire Protection
Built with a dedicated fire protection function and multiple electrical protection layers for safe operation in occupied residential settings.
Wide Operating Window
Rated to discharge down to -10°C as standard, with an optional internal warm-up function extending charge and discharge operation down to -25°C.
Outdoor-Rated, Fanless Design
IP65-rated housing with natural convection cooling means no moving parts and no fan noise — suitable for indoor or outdoor floor-standing installation.
Technical Specification
| Specification | Value |
|---|---|
| Electrical Characteristics | |
| Battery Type | LFP (LiFePO₄) |
| Nominal Capacity (per module) | 7.02kWh |
| Nominal Voltage (per module) | 57.6V |
| Max. Charge/Discharge Current | 80A |
| Recommended Charge/Discharge Current | 50A |
| Peak Discharge Current | 110A (60 sec) |
| Battery Pack Round-Trip Efficiency | >95% (@25°C, 0.3C) |
| Depth of Discharge | 90% |
| Communication | CAN |
| Display | 1 x status LED |
| Specification | Value |
|---|---|
| Operating Conditions | |
| Installation Location | Outdoor / Indoor (floor-standing on stand) |
| Operating Temperature (standard) | Charge: 0~55°C | Discharge: -10~55°C |
| Operating Temperature (optional warm-up) | Charge: -25~55°C | Discharge: -25~55°C |
| Storage Temperature | -10~50°C |
| Cooling Method | Natural convection |
| Humidity | 5~95% (non-condensing) |
| Max. Operating Altitude | 3,000m |
| Specification | Value |
|---|---|
| Certification & Protection | |
| Fire Protection Function | Yes, integrated |
| Ingress Protection | IP65 |
| Safety | IEC 62619 |
| EMC | IEC 61000-6-1 / -2 / -3 / -4 |
| Transportation | UN38.3 |
| Max. Modules in Series | 14 (1 Master + up to 13 Slaves) |
Stack Sizing Reference (1 x Master + Slaves)
| Stack | Modules | Capacity | Operating Voltage | Stack Dimensions (W x D x H) | Stack Weight |
|---|---|---|---|---|---|
| L2 (min. stack) | 1M + 1S | 14.04kWh | 115.2V | 660 x 360 x 420mm | 105.5kg ±5% |
| L3 | 1M + 2S | 21.06kWh | 172.8V | 660 x 360 x 575mm | 156.0kg ±5% |
| L4 | 1M + 3S | 28.08kWh | 230.4V | 660 x 360 x 730mm | 206.5kg ±5% |
| L5 | 1M + 4S | 35.10kWh | 288.0V | 660 x 360 x 885mm | 257.0kg ±5% |
| L6 | 1M + 5S | 42.12kWh | 345.6V | 660 x 360 x 1040mm | 307.5kg ±5% |
| L7 (max. for H1-G2 / K series) | 1M + 6S | 49.14kWh | 403.2V | 660 x 360 x 1195mm | 358.0kg ±5% |
Frequently Asked Questions
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
The Fox ESS CQ7 Slave (Part No: FE-CQ7-S) is the battery expansion module for the Fox ESS CQ7 high-voltage storage system, adding a further 7.02kWh of LiFePO₄ (LFP) capacity to any existing CQ7 stack. Unlike the Master module, the Slave contains battery cells only — no system controller — keeping each added module lighter and simpler to install. Slave modules are added one at a time in series with a single CQ7 Master (FE-CQ7-M, sold separately) to scale a stack from 14.04kWh up to a maximum of 98.28kWh.
7.02kWh
Module Capacity
57.6V
Nominal Voltage
80A
Max Charge/Discharge
90%
Depth of Discharge
>95%
Round-Trip Efficiency
IP65
Ingress Protection
Qualified Installation Required
High-voltage battery wiring must be carried out by a qualified, competent electrician in accordance with BS 7671 and Part P of the Building Regulations. Where the installation forms part of an MCS-certified renewable system, work must be completed by an MCS-accredited installer.
Requires a CQ7 Master to Operate
The CQ7 Slave is a battery-only expansion module and cannot function as a standalone system. Every stack must include exactly one CQ7 Master (FE-CQ7-M), sold separately, which provides the system controller, BMU and inverter communication that the whole stack relies on.
Plug-and-Play Capacity Expansion
Each Slave module simply stacks in series on top of the existing tower, adding 7.02kWh of usable LFP capacity per unit with no additional control electronics required. Up to 13 Slave modules can be combined with a single Master, taking total stack capacity as high as 98.28kWh.
Why It Performs
Pure Capacity Expansion
Adds 7.02kWh of LiFePO₄ capacity per module with no duplicate control electronics, keeping incremental expansion cost-efficient as a stack grows.
CAN Communication
Integrates into the stack's CAN bus, reporting cell-level data back to the Master module for accurate state-of-charge and balancing across the full tower.
Scalable Architecture
Up to 13 Slave modules can be installed in series with one Master, allowing installers to size a system precisely to the property's storage requirement.
Integrated Fire Protection
Built with a dedicated fire protection function and multiple electrical protection layers for safe operation in occupied residential settings.
Wide Operating Window
Rated to discharge down to -10°C as standard, with an optional internal warm-up function extending charge and discharge operation down to -25°C.
Outdoor-Rated, Fanless Design
IP65-rated housing with natural convection cooling means no moving parts and no fan noise — suitable for indoor or outdoor floor-standing installation.
Technical Specification
| Specification | Value |
|---|---|
| Electrical Characteristics | |
| Battery Type | LFP (LiFePO₄) |
| Nominal Capacity (per module) | 7.02kWh |
| Nominal Voltage (per module) | 57.6V |
| Max. Charge/Discharge Current | 80A |
| Recommended Charge/Discharge Current | 50A |
| Peak Discharge Current | 110A (60 sec) |
| Battery Pack Round-Trip Efficiency | >95% (@25°C, 0.3C) |
| Depth of Discharge | 90% |
| Communication | CAN |
| Display | 1 x status LED |
| Specification | Value |
|---|---|
| Operating Conditions | |
| Installation Location | Outdoor / Indoor (floor-standing on stand) |
| Operating Temperature (standard) | Charge: 0~55°C | Discharge: -10~55°C |
| Operating Temperature (optional warm-up) | Charge: -25~55°C | Discharge: -25~55°C |
| Storage Temperature | -10~50°C |
| Cooling Method | Natural convection |
| Humidity | 5~95% (non-condensing) |
| Max. Operating Altitude | 3,000m |
| Specification | Value |
|---|---|
| Certification & Protection | |
| Fire Protection Function | Yes, integrated |
| Ingress Protection | IP65 |
| Safety | IEC 62619 |
| EMC | IEC 61000-6-1 / -2 / -3 / -4 |
| Transportation | UN38.3 |
| Max. Modules in Series | 14 (1 Master + up to 13 Slaves) |
Stack Sizing Reference (1 x Master + Slaves)
| Stack | Modules | Capacity | Operating Voltage | Stack Dimensions (W x D x H) | Stack Weight |
|---|---|---|---|---|---|
| L2 (min. stack) | 1M + 1S | 14.04kWh | 115.2V | 660 x 360 x 420mm | 105.5kg ±5% |
| L3 | 1M + 2S | 21.06kWh | 172.8V | 660 x 360 x 575mm | 156.0kg ±5% |
| L4 | 1M + 3S | 28.08kWh | 230.4V | 660 x 360 x 730mm | 206.5kg ±5% |
| L5 | 1M + 4S | 35.10kWh | 288.0V | 660 x 360 x 885mm | 257.0kg ±5% |
| L6 | 1M + 5S | 42.12kWh | 345.6V | 660 x 360 x 1040mm | 307.5kg ±5% |
| L7 (max. for H1-G2 / K series) | 1M + 6S | 49.14kWh | 403.2V | 660 x 360 x 1195mm | 358.0kg ±5% |
Frequently Asked Questions
