Fox ESS EQ2900 2.88kWh High-Voltage Battery Module (Master)
The Fox ESS EQ2900 Master (part number FE-HV-EQM-2900, supplier part number FE-EQ2900-M, model EQM2900) is the master high-voltage battery module in the Fox ESS EQ Series. Each module delivers 2.88 kWh using LFP (LiFePO₄) chemistry with 90% depth of discharge and a round-trip efficiency greater than 95%. The modular, floor-mounted, stackable design supports a minimum configuration of 2 modules (1 x Master + 1 x Slave) up to a maximum of 7 modules per stack (1 x Master + 6 x Slaves) for 20.16 kWh total capacity. The EQ2900 Master includes the system controller and is required in every stack. CAN/RS485 communication, IP65 rated, with a 12-year warranty upon registration. Compatible with the full range of Fox ESS single-phase and three-phase hybrid and AC inverters. Available from DECO Group, a UK-based solar wholesaler for professional trade installers.
Key Technical Details (Single Master Module)
- Part number: FE-HV-EQM-2900
- Supplier part number: FE-EQ2900-M
- Model: EQM2900 (Master)
- Battery chemistry: LFP (LiFePO₄)
- Nominal energy: 2,880 Wh (2.88 kWh) per module
- Depth of discharge: 90%
- Round-trip efficiency: greater than 95%
- Continuous discharge rate: 2,875 W
- Maximum discharge rate (5 minutes): 2,875 W
- Surge discharge rate (15 seconds): 3,737 W
- Maximum charge rate (5 minutes): 2,875 W
- Communication: CAN / RS485
- Display: LED x 6
- Ingress protection: IP65
- Weight: 37 kg
Stack Specifications (EQ2900-L2: 1 x Master + 1 x Slave)
- Nominal capacity: 5,760 Wh (5.76 kWh)
- Nominal voltage: 115.2 V
- Operating voltage: 97.2 V to 131.4 V
- Recommended discharge current: 25 A
- Maximum charge/discharge current: 50 A
- Peak discharge current: 65 A @ 60 seconds
- Cycle life: ≥6,000 cycles (measured at 25°C, 90% DoD, 0.5C charge/discharge)
- Scalability: Maximum 7 modules in series per stack
- Maximum stack capacity: 20.16 kWh (1 x Master + 6 x Slaves)
- Dimensions (2-module stack): 570 x 350 x 380 mm (W x H x D)
- Weight (2-module stack): 71.1 kg
Environmental and General
- Operating temperature: Charge 0°C to 55°C; Discharge -10°C to 55°C
- Storage temperature: -10°C to 40°C
- Cooling: Natural convection
- Humidity: 5% to 95% (no condensation)
- Maximum altitude: 3,000 m
- Installation: Outdoor or indoor, floor-mounted (stand)
- Ingress protection: IP65
Key Features
- 2.88 kWh per module with long-life LFP chemistry and 90% usable depth of discharge
- Scalable from 5.76 kWh (2 modules) up to 20.16 kWh (7 modules) per stack
- Round-trip efficiency greater than 95% with cycle life of 6,000 cycles or more
- Floor-mounted, stackable form factor with compact footprint and plug-and-play buckle-fixing design
- CAN/RS485 communication for system integration and monitoring
- IP65 rated for indoor or outdoor installation
- Compatible with the full range of Fox ESS single-phase and three-phase hybrid and AC inverters
- 12-year warranty upon registration with Fox ESS
System Compatibility
- Compatible with all Fox ESS single-phase and three-phase hybrid inverters and AC charger inverters
- This is the master module and is required in every EQ2900 battery stack
- Single-phase minimum configuration: 1 x Master + 1 x Slave
- Three-phase minimum configuration: 1 x Master + 2 x Slaves
- Maximum configuration: 1 x Master + 6 x Slaves (7 modules, 20.16 kWh)
- When adding modules to a pre-existing stack, new batteries must be compatible with the original modules. Contact your technical support team with a photograph of the existing stack to confirm compatibility.
Installation Notes
- Floor-mounted stackable installation with plug-and-play buckle fixing
- At 37 kg per master module, a two-person lift is required
- IP65 rated for indoor or outdoor siting
- Ensure the stack configuration meets the inverter battery voltage window for the chosen system design
- Must be installed by a qualified electrician or technician in compliance with local wiring regulations
Certifications and Compliance
- IEC 62619 (Safety)
- EMC: EN IEC 61000-6-1/2/3/4
- Transportation: UN38.3
Warranty
- 12-year warranty upon registration with Fox ESS online
Common Questions
Click a question below to reveal the answer.
Can the Fox ESS EQ2900 Master operate on its own?
No. The EQ2900 system requires a minimum of 2 modules: 1 x Master + 1 x Slave for single-phase, or 1 x Master + 2 x Slaves for three-phase systems.
What is the difference between the EQ2900 Master and Slave?
The Master module (EQM2900) contains the system controller and is required in every stack. Only one Master is used per stack; additional capacity is added using Slave modules (EQS2900). Both modules have 2.88 kWh capacity.
How many EQ2900 modules can be installed in one stack?
A maximum of 7 modules per stack (1 x Master + 6 x Slaves), giving a total capacity of 20.16 kWh.
What inverters are compatible with the Fox ESS EQ2900?
The EQ2900 is compatible with the full range of Fox ESS single-phase and three-phase hybrid inverters and AC charger inverters.
What is the cycle life of the Fox ESS EQ2900?
The EQ2900 is rated at 6,000 cycles or more, measured at 25°C, 90% DoD, and 0.5C charge/discharge rate.
DECO Group supplies Fox ESS EQ2900 master and slave battery modules alongside compatible hybrid inverters, AC charger inverters, and all associated system components. Browse our Fox ESS battery storage catalogue for complete scalable energy storage system configurations.
About DECO Group
We are a UK solar and energy storage wholesaler supplying high-voltage battery modules, hybrid inverters, and balance-of-system components to professional installers and electrical contractors. Our Fox ESS EQ battery range is stocked with both master and slave modules for flexible system sizing. Visit decogroup.co.uk for the full catalogue.
