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FOX ESS CQ7-S (W) – 6.96kWh Battery Module Slave with Heating Element

The FOX ESS CQ7-S (W) is the slave expansion battery module for the FOX ESS CQ7 high-voltage residential energy storage system, designed to increase storage capacity while maintaining optimal performance in cold-climate environments. Utilizing advanced Lithium Iron Phosphate (LFP / LiFePO4) battery technology, each CQ7-S (W) module provides 6.96kWh of usable energy storage and expands system capacity in convenient 6.96kWh increments.

The CQ7-S (W) is specifically designed to operate alongside the FOX ESS CQ7-M (W) Master Module, which manages system communication, battery monitoring, and protection functions. Together, these modules create a highly scalable energy storage platform capable of supporting a wide range of residential energy requirements.

Engineered for demanding climates, the Winter Version includes an integrated battery heating element identical to that used in the CQ7-M (W) master module. This ensures thermal consistency across the entire battery stack and enables reliable charging and discharging operation in temperatures ranging from -25°C to +55°C. The heated design makes the CQ7-S (W) an ideal solution for installations in alpine regions, frost-prone inland locations, and other environments where low temperatures can impact battery performance.

Each expansion module adds 6.96kWh of capacity without requiring additional control electronics, as all battery management and communication functions are centralized within the master module. A single CQ7-M (W) master can support up to thirteen CQ7-S (W) slave modules, allowing a maximum system capacity of 97.44kWh in a single battery stack.

The CQ7-S (W) features a robust IP65-rated enclosure suitable for indoor and outdoor installations, a simple LED status indicator for operational monitoring, and compliance with internationally recognized safety and performance standards including IEC 62619, UN38.3, and IEC 61000-6 EMC certification.

Key Features

• 6.96kWh Lithium Iron Phosphate (LFP / LiFePO4) battery capacity

• Slave expansion module for FOX ESS CQ7 high-voltage battery systems

• Integrated heating element for cold-climate operation

• Operating temperature range from -25°C to +55°C

• 100% Depth of Discharge (DoD)

• High-voltage battery architecture

• Scalable modular design

• Adds capacity in 6.96kWh increments

• Supports systems up to 97.44kWh per stack

• Compatible exclusively with FOX ESS CQ7-M (W) Master Modules

• Single LED status indicator

• CAN communication via the master module

• IP65-rated enclosure for indoor and outdoor installation

• Fan-free, low-maintenance operation

• High safety, reliability, and long service life

• Certified to IEC 62619, UN38.3, and IEC 61000-6 standards

Technical Specifications

Scalable Cold-Climate Energy Storage

The FOX ESS CQ7-S (W) allows homeowners to easily expand the storage capacity of their CQ7 battery system while maintaining reliable performance in extreme weather conditions. The integrated heating technology ensures every module in the stack operates within optimal temperature parameters, delivering consistent energy availability throughout the year.

When combined with a CQ7-M (W) Master Module and a compatible FOX ESS hybrid inverter, the CQ7-S (W) provides a flexible, efficient, and future-ready energy storage solution that maximizes solar self-consumption, energy independence, and system reliability.

Important Compatibility Note: CQ7-S (W) heated slave modules must only be installed with FOX ESS CQ7-M (W) heated master modules. Do not mix heated and non-heated CQ7 battery components within the same system.