Fox ESS CQ7 High Voltage Battery System

The Fox ESS CQ7 is a premium high-voltage battery storage system designed for homeowners and businesses looking for powerful, efficient and expandable energy storage. Built around a modular 6.96kWh battery architecture, the CQ7 allows you to select the storage capacity that suits your property today while providing the flexibility to build a much larger system. Fox ESS specifies the CQ7 platform as scalable all the way to 97.44kWh, making it suitable for everything from residential solar storage to larger energy-demand applications. For customers investing in solar and battery storage, the CQ7 combines the key features that matter: high usable capacity, LFP battery chemistry, high efficiency, strong charge and discharge capability, weather-resistant construction and a modular design that can grow with future energy requirements. Why Choose the Fox ESS CQ7? More Usable Energy with 100% Depth of Discharge Fox ESS specifies the CQ7 with 100% depth of discharge (DoD). This means the nominal capacity and usable capacity are the same across the configurations listed in the manufacturer's datasheet. For example, a 27.84kWh CQ7 system is specified with 27.84kWh of usable battery capacity. For customers, this makes it easier to understand how much of the advertised battery capacity is actually available for energy storage. High-Efficiency Energy Storage Storing solar energy only makes sense if the battery can return that energy efficiently when it is needed. Fox ESS specifies the CQ7 battery pack at greater than 95% round-trip efficiency under its stated test conditions of 25°C and 0.3C charging/discharging. Higher battery efficiency means less energy is lost during the process of charging and discharging the battery. Powerful 80A Charge & Discharge Capability The CQ7 supports a maximum charge/discharge current of 80A, giving the platform substantial power capability as system capacity increases. The manufacturer's datasheet lists nominal system power from 9.22kW on the 13.92kWh CQ7-L2 through to 32.26kW on the 48.72kWh CQ7-L7 configuration. Actual available current can vary according to temperature, cell voltage and state of charge. Premium LFP Battery Technology The CQ7 uses LFP (LiFePO₄) battery chemistry throughout the range. LFP has become a widely used chemistry for stationary energy storage, making the CQ7 a strong option for customers wanting a modern lithium battery platform for their solar and energy-storage system. Built to Grow with Your Energy Needs One of the biggest advantages of the CQ7 is its modular architecture. Rather than purchasing a completely different battery system when greater storage is required, the CQ7 platform uses individual 6.96kWh modules that are installed in series. Every CQ7 system consists of: 1 × CQ7-M Master Module plus 1 or more CQ7-S Expansion Modules The CQ7-M contains both the battery module and the controller for the complete battery system. CQ7-S modules provide additional battery capacity. Each system must contain exactly one CQ7-M, with Fox ESS allowing up to 13 CQ7-S modules. That provides a maximum system size of 14 modules and 97.44kWh. Choose the Right Capacity for Your Property This listing is available in six complete system sizes: 13.92kWh – CQ7-L2 A strong starting point for customers looking for substantial home battery storage without moving immediately into a very large system. Configuration: 1 × CQ7-M + 1 × CQ7-S Usable Capacity: 13.92kWh Nominal Power: 9.22kW 20.88kWh – CQ7-L3 Provides considerably more storage for homes with higher electricity consumption or customers wanting to store more excess solar generation. Configuration: 1 × CQ7-M + 2 × CQ7-S Usable Capacity: 20.88kWh Nominal Power: 13.82kW 27.84kWh – CQ7-L4 A high-capacity configuration suited to properties with substantial energy requirements. Configuration: 1 × CQ7-M + 3 × CQ7-S Usable Capacity: 27.84kWh Nominal Power: 18.43kW 34.80kWh – CQ7-L5 A substantial storage system for customers looking to retain significantly more energy for later use. Configuration: 1 × CQ7-M + 4 × CQ7-S Usable Capacity: 34.80kWh Nominal Power: 23.04kW 41.76kWh – CQ7-L6 Designed for larger energy requirements where high battery capacity and strong power capability are important. Configuration: 1 × CQ7-M + 5 × CQ7-S Usable Capacity: 41.76kWh Nominal Power: 27.65kW 48.72kWh – CQ7-L7 The largest configuration offered in this listing, delivering almost 50kWh of usable battery storage. Configuration: 1 × CQ7-M + 6 × CQ7-S Usable Capacity: 48.72kWh Nominal Power: 32.26kW Store More of Your Solar Energy A battery allows excess solar generation to be stored instead of being immediately exported when the property is not using it. That stored energy can then be available later when solar production is lower, including during the evening or overnight, subject to the configuration of the overall solar, inverter and battery system. With capacities ranging from 13.92kWh to almost 50kWh in this listing, the CQ7 provides options for properties with very different electricity consumption profiles. A Battery System That Doesn't Lock You Into One Size Energy requirements can change. A household may add an EV, heat-pump hot water system, pool equipment or additional electrical loads. A business may increase its operating hours or equipment requirements. The CQ7's modular architecture is designed to provide flexibility. Fox ESS specifically describes the CQ7 as a scalable battery storage system with additional batteries installed in series and a maximum capacity of 97.44kWh. This gives customers a battery platform capable of accommodating much larger storage configurations than the systems offered in this particular listing. High-Voltage Battery Architecture The CQ7 is a high-voltage storage battery system. As additional modules are installed, nominal system voltage increases. The configurations in this listing range from 115.2V to 403.2V nominal voltage. High-voltage architecture is particularly well suited to modern compatible hybrid inverter and energy-storage systems where efficient transfer of substantial amounts of power is required. Designed for Indoor or Outdoor Installation The CQ7 offers flexibility when choosing an installation location. Fox ESS specifies: Ingress Protection: IP65 Installation Location: Indoor / Outdoor (Stand) Cooling: Natural convection Humidity: 5–95%, non-condensing Maximum Altitude: 3,000m Its IP65 rating makes the enclosure suitable for appropriately installed outdoor applications as well as indoor battery installations. Wide Operating Temperature Range Fox ESS specifies standard operating temperatures of: Charging: 0°C to 55°C Discharging: -10°C to 55°C An optional warm-up version is also specified, extending charge and discharge operation down to -25°C under the conditions stated by Fox ESS. Integrated Fire Protection Function Fox ESS lists a fire protection function as part of the CQ7 system's protection specifications. The system is also specified against IEC 62619 for safety, IEC 61000-6-1/2/3/4 for EMC and UN38.3 for transportation. Clean, Space-Efficient Modular Design The CQ7 uses a vertically stacked design rather than requiring multiple separate battery cabinets. Each additional CQ7-S module increases the height of the system while maintaining the same 660mm × 360mm footprint specified in the datasheet. This creates a clean, integrated battery tower while allowing significant amounts of storage capacity to be installed within a relatively compact footprint. Plug & Play Installation Design Fox ESS describes the CQ7 as using a plug-and-play solution designed to make installation easier and save installer time. The modular approach also simplifies system configuration because capacity is increased through additional compatible CQ7-S modules rather than completely separate battery systems. Key Benefits 13.92kWh to 48.72kWh options in this listing 6.96kWh modular battery architecture Up to 97.44kWh maximum CQ7 platform capacity 100% depth of discharge 95% battery pack round-trip efficiency LFP (LiFePO₄) battery chemistry Maximum 80A charge/discharge current High-voltage battery architecture Modular and expandable design One integrated CQ7-M master/controller module CQ7-S expansion modules for additional capacity Maximum 14 modules in series CAN communication IP65 ingress protection Indoor or outdoor installation Integrated fire protection function Natural convection cooling Plug-and-play installation design IEC 62619 safety certification UN38.3 transportation certification Available Configurations Model Usable Capacity Nominal Power Battery Configuration CQ7-L2 13.92kWh 9.22kW 1 × CQ7-M + 1 × CQ7-S CQ7-L3 20.88kWh 13.82kW 1 × CQ7-M + 2 × CQ7-S CQ7-L4 27.84kWh 18.43kW 1 × CQ7-M + 3 × CQ7-S CQ7-L5 34.80kWh 23.04kW 1 × CQ7-M + 4 × CQ7-S CQ7-L6 41.76kWh 27.65kW 1 × CQ7-M + 5 × CQ7-S CQ7-L7 48.72kWh 32.26kW 1 × CQ7-M + 6 × CQ7-S Fox ESS CQ7 – High-Capacity Storage with Room to Grow The CQ7 combines high usable capacity, modular expansion and high-voltage architecture in one integrated battery platform. For customers who want more than a small fixed-capacity home battery, its biggest advantage is flexibility: start with the capacity appropriate for the property and use a platform designed to support systems all the way to 97.44kWh. With 100% depth of discharge, >95% specified battery pack round-trip efficiency, LFP chemistry, IP65 protection and a modular plug-and-play architecture, the CQ7 provides a strong foundation for a modern solar and energy-storage system. Please note: Battery and inverter compatibility, system sizing, installation requirements and permitted expansion should be confirmed by a suitably qualified installer before purchase.