FoxESS CQ7-S 6.96kWh extension module6.96kWh 57.6V extension module for CQ7 towers

Overview

The CQ7-S is the extension module of the CQ7 system, adding 6.96kWh and 57.6V per unit to a tower run by a CQ7-M controller. It contains 121Ah lithium iron phosphate cells with a status LED and fire-suppression module in a 660×190×360mm IP65 housing of 50.5kg. Between one and thirteen CQ7-S can be stacked per tower, so capacity grows from 13.92kWh to 97.44kWh while sustaining 80A continuous and 120A for 60 seconds.

• 6.96kWh, 57.6V, 121Ah modules
• One CQ7-M controller plus up to 13 CQ7-S
• Towers of 13.92–97.44kWh, 115.2–806.4V nominal
• 80A continuous, 120A for 60 seconds
• IP65 floor-standing, indoor or outdoor
• Aerosol fire suppression in every module

How it works

A CQ7 tower is a series stack of 57.6V lithium iron phosphate modules. The CQ7-M at the top contains a battery module plus the system controller, DC switch, power button and CAN port for the inverter; the CQ7-S modules underneath hold cells only. One CQ7-M can manage up to 13 CQ7-S, so a single tower spans 2 to 14 modules, from 13.92kWh at 115.2V to 97.44kWh at 806.4V nominal.

Key features

Compared with the EQ series, the CQ7 handles more current: 80A continuous charge and discharge, 50A recommended, and 120A for 60 seconds, at 90% depth of discharge. FoxESS rates CQ7 towers for at least 6000 cycles at 25°C to 70% SOH and states above 95% round-trip efficiency. Each unit contains a thermally activated aerosol fire-suppression module. Standard modules charge from 0°C; warm-up (w) versions are listed in the manual for operation down to -25°C.

Installation and compatibility

The stack stands on footstands on a hard, level floor and is fixed to the wall with brackets; the CQ7-M package includes the inverter communication cable and a DC output cable with 16mm² conductors. Indoors the room must be at least 10m², and the battery must stay 2m from heat sources. Tower height grows by 155mm per module, from 420mm to 2280mm, on a 660×360mm footprint.

The wide voltage range suits FoxESS's commercial hybrids: FoxESS Italy publishes CEI 0-21 and CEI 0-16 declarations for the H3-Plus range with CQ7 configurations starting from four modules. The system voltage must always lie within the battery port range of the chosen inverter.

Monitoring and settings

Six LEDs on the CQ7-M show state of charge and faults, and each CQ7-S has a status LED. Through the hybrid inverter the battery is visible in the FoxCloud app and web platform. A black-start sequence on the power button allows a restart with no grid or PV.

Questions and answers