Fox ESS CQ16 16.07kWh High Voltage Stackable Battery | Commercial LFP Storage Module UK

Description

The Fox ESS CQ16 is a high-voltage, stackable LFP battery module providing 16.07kWh of usable-rated capacity per unit, purpose-built for commercial and industrial energy storage systems. Modules connect in series to build scalable battery banks from 64.28kWh up to 241.05kWh, supporting a 90% depth of discharge and >92% charge/discharge efficiency. Designed exclusively for use with the Fox ESS H3 Plus inverter range, the CQ16 is a floor-mounted, indoor-only battery with intelligent air cooling and IP20 protection.

16.07kWh

Capacity per Module

51.2V

Nominal Voltage

240A

Max Charge/Discharge

90%

Depth of Discharge

241.05kWh

Max System Size

128kg

Weight per Module

Indoor Installation Only

The CQ16 is only suitable for indoor installation and is not water resistant. It must be installed by a qualified electrician in a dry, ventilated location away from flammable or explosive materials.

System Build Requirements

A minimum of 4 battery modules (64.28kWh) is required per system, in stacks of up to 4 modules each. Every system requires one Fox ESS CQ16 BMS Control Box, plus one Battery Base and one Cable Pack per stack — these are sold separately.

Inverter Compatibility

The CQ16 is compatible exclusively with the Fox ESS H3 Plus inverter range. Each of the H3 Plus's three battery ports can support a CQ16 system of up to 45 battery modules.

Stackable High-Voltage Architecture

Modules connect in series with a 51.2V nominal voltage each, allowing installers to scale a single system from 4 modules (64.28kWh) up to 15 modules (241.05kWh) without changing the underlying battery technology.

90% Depth of Discharge

A high usable capacity ratio means more of the rated 16.07kWh per module is actually available for daily cycling, improving the economics of commercial self-consumption and peak-shaving applications.

Intelligent Air Cooling

Built-in intelligent air cooling control manages module temperature automatically across a 0–55°C charge and −10–55°C discharge range, supporting consistent performance in plant room environments.

Compact Floor-Mounted Footprint

At 390 × 235 × 810mm per module, the CQ16 stacks vertically in a small floor footprint, making it practical to fit substantial storage capacity into constrained commercial plant spaces.

LFP Chemistry for Safety and Longevity

Lithium Iron Phosphate (LiFePO₂) cell chemistry offers strong thermal stability for demanding commercial duty cycles, backed by a dedicated fire protection module in each unit.

Certified for Commercial Deployment

Tested to IEC 62619 for stationary battery safety, IEC 61000-6-1/2/3/4 for EMC, and UN38.3 for transport, giving specifiers a recognised compliance basis for C&I projects.

Battery Module
Model	CQ16
Nominal Voltage	51.2 Vdc
Operating Voltage Range	46.4 – 58.4 Vdc
Nominal Capacity	314 Ah
Nominal Energy	16.07 kWh
Max. Charge/Discharge Current	240 A
Recommended Discharge Current	157 A
Peak Discharge Current	470 A @ 60s
Depth of Discharge	90%
Environmental
Storage Temperature	−10 to 50°C
Operating Temperature	Charge: 0–55°C / Discharge: −10–55°C
Humidity	5 – 95% (no condensation)
Altitude	3000 m
Installation Location	Indoor only
Construction
Display	1 × LED (battery)
Scalability	Max. 15 modules in series
Cooling Method	Intelligent air cooling
Ingress Protection	IP20
Fire Protection Function	Yes
Warming Function	No
Dimensions (W×H×D)	390 × 235 × 810 mm
Weight (approx.)	128 kg
Cell Net Weight	88.8 kg
System Scalability
Minimum System Size	4 modules / 64.28 kWh
Maximum System Size	15 modules / 241.05 kWh
Max. Modules per Stack	4
Compatible Inverter Range	Fox ESS H3 Plus
Max. Modules per Inverter (3 ports)	45
Certification
Safety	IEC 62619
EMC	IEC 61000-6-1/2/3/4
Transportation	UN38.3

How much capacity does one CQ16 module provide?

Each CQ16 module provides 16.07kWh of nominal energy with a 90% usable depth of discharge, at a nominal voltage of 51.2Vdc.

What is the minimum and maximum system size?

A CQ16 system requires a minimum of 4 modules (64.28kWh) and can scale up to 15 modules (241.05kWh) per system, built up in stacks of up to 4 modules each.

What else do I need to build a complete CQ16 system?

Every system needs one BMS Control Box, plus one Battery Base and one Cable Pack for each stack of up to 4 modules — these are sold as separate items.

Which inverters is the CQ16 compatible with?

The CQ16 is designed exclusively for the Fox ESS H3 Plus three-phase hybrid inverter range, connecting via the inverter's high-voltage battery ports.

Can the CQ16 be installed outdoors?

No — the CQ16 is rated IP20 and is for indoor installation only. It is not water resistant and must be kept in a dry, ventilated plant space.

What battery chemistry does the CQ16 use?

The CQ16 uses Lithium Iron Phosphate (LFP) cells, chosen for thermal stability, and includes a dedicated fire protection module per unit.

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