Fox ESS EQ4800 4.66kWh High-Voltage Battery Module (Master)
The Fox ESS EQM4800 (part number FE-HV-EQM-4800) is a 4.66 kWh high-voltage lithium iron phosphate (LiFePO₄) master battery module from the Fox ESS EQ storage platform. The master module includes the BMS and acts as the control and communication hub for the battery stack; one is required per system. Each module provides 4.66 kWh, scaling up to 41.94 kWh total capacity (1 x Master + 8 x Slaves). With 90% depth of discharge and CAN/RS485 communication, the EQ4800 Master is designed for residential and light commercial energy storage. This is a direct replacement for the Fox ESS ECM4800 battery, identical in specification with updated firmware. Compatible with Fox ESS H1, H1-G2, KH, H3, and H3 Pro inverters. Available from DECO Group, a UK-based solar wholesaler for professional trade installers.
Key Technical Details
- Part number: FE-HV-EQM-4800
- Supplier part number: FE-HV-EQM-4800
- Model: EQM4800 (Master)
- Battery chemistry: LiFePO₄ (LFP)
- Nominal energy: 4,660 Wh (4.66 kWh) per module
- Depth of discharge: 90%
- Continuous discharge rate: 2,330 W
- Maximum discharge rate (5 minutes): 4,460 W
- Surge discharge rate (15 seconds): 5,785 W
- Maximum charge rate (5 minutes): 4,460 W
- Communication: CAN / RS485
- System role: Master (includes BMS, required for system operation)
- Maximum modules per stack: 9 (1 x Master + 8 x Slaves)
- Maximum stack capacity: 41.94 kWh
- Weight: 44.5 kg
Key Features
- 4.66 kWh capacity per module with LiFePO₄ chemistry and 90% usable depth of discharge
- Master module includes the BMS; one is required per battery stack
- Scalable from a minimum 2-module stack (9.32 kWh) up to 9 modules (41.94 kWh)
- Direct replacement for the Fox ESS ECM4800 (identical specification, updated firmware)
- CAN/RS485 communication for system integration and monitoring
- Plug-and-play installation for fast on-site build-out
- Wide temperature tolerance
- 12-year warranty upon registration with Fox ESS
System Compatibility
- Compatible with Fox ESS H1, H1-G2, KH, H3, and H3 Pro inverters
- This is the master module and is required in every EQ4800 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 + 8 x Slaves (9 modules, 41.94 kWh)
- Direct replacement for the predecessor ECM4800; backward compatible with EQ4800 Slave modules
Installation Notes
- At 44.5 kg, a two-person lift is required
- Stackable modular installation
- All battery modules in the stack must be compatible
- Must be installed by a qualified electrician or technician in compliance with local wiring regulations
Warranty
- Standard warranty: 5 years
- Extended warranty: 12 years when the installation is registered with Fox ESS online
Common Questions
Click a question below to reveal the answer.
What is the difference between the Fox ESS EQ4800 Master and Slave?
The Master module (EQM4800) contains the BMS and acts as the control hub for the battery stack. Only one Master is used per stack; additional capacity is added using Slave modules (EQS4800). Both modules provide 4.66 kWh capacity. The Master weighs 44.5 kg vs 41.5 kg for the Slave.
Can the Fox ESS EQ4800 Master operate on its own?
No. The EQ4800 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.
Is the Fox ESS EQ4800 a replacement for the ECM4800?
Yes. The EQ4800 Master is a direct replacement for the ECM4800, identical in specification with updated firmware and a new product name.
How many EQ4800 modules can be installed in one stack?
A maximum of 9 modules per stack (1 x Master + 8 x Slaves), giving a total capacity of 41.94 kWh.
What inverters are compatible with the Fox ESS EQ4800?
The EQ4800 is compatible with Fox ESS H1, H1-G2, KH, H3, and H3 Pro inverters.
DECO Group supplies Fox ESS EQ4800 master and slave battery modules alongside compatible H1, KH, H3, and H3 Pro hybrid inverters and all associated system accessories. Browse our Fox ESS battery storage catalogue for complete scalable energy storage configurations.
About DECO Group
We supply Fox ESS high-voltage battery modules, hybrid inverters, and balance-of-system components to professional installers and electrical contractors across the UK. Our EQ battery range covers all capacity variants from 2.88 kWh to 4.66 kWh per module with master and slave units in stock. Visit decogroup.co.uk for the full catalogue.
