Fox ESS ECS 2900 2.88kWh High-Voltage Battery Module (Master) V2.0 Connector Type B
The Fox ESS ECS 2900 Master V2.0 Connector B (part number FE-HV-ECM-2900, model ECM2900) is a 2.88 kWh high-voltage lithium iron phosphate battery module designed as the master unit within the Fox ESS Energy Cube S storage platform. This is a Version 2 module with Connector Type B. The modular, 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 master module includes the BMS and is required in every stack. With 90% depth of discharge, CAN/RS485 communication, and plug-and-play installation, the ECS 2900 is suited to residential and light commercial energy storage. Connector type must be matched when expanding an existing stack. Available from DECO Group, a UK-based solar wholesaler for professional trade installers.
Key Technical Details
- Part number: FE-HV-ECM-2900
- Supplier part number: FE-HV-ECM-2900
- Model: ECM2900 (Master)
- Version: V2.0
- Connector type: B
- Battery chemistry: Lithium iron phosphate (LiFePO₄)
- Nominal energy: 2,880 Wh (2.88 kWh) per module
- Depth of discharge: 90%
- Continuous discharge rate: 1,440 W
- Maximum discharge rate (5 minutes): 2,880 W
- Surge discharge rate (15 seconds): 3,000 W
- Maximum charge rate (5 minutes): 2,880 W
- Communication: CAN / RS485
- Weight: 37.95 kg
Key Features
- 2.88 kWh capacity per module with 90% usable depth of discharge
- LiFePO₄ chemistry for stable, safe, long-life energy storage
- Scalable from 5.76 kWh (2 modules) up to 20.16 kWh (7 modules) per stack
- Master module includes the BMS; one is required per stack
- Plug-and-play installation with compact stackable design
- CAN/RS485 communication for system integration
- 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 ECS 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)
Installation Notes
- This is a Version 2 battery with Connector Type B. When expanding an existing Energy Cube stack, the connector type must match. DECO Group stocks both Connector Type A and Connector Type B variants.
- V1 and V2 batteries are not interchangeable. If unsure of your existing battery version, consult the Fox ESS compatibility guide before ordering.
- 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.
- At 37.95 kg, a two-person lift is required
- 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 Connector Type A and Connector Type B?
The ECS 2900 V2.0 is available in two connector variants: Type A and Type B. When expanding an existing stack, the connector type on the new modules must match the existing modules. DECO Group stocks both variants. If you are unsure which type you need, provide a photograph of your existing stack for compatibility confirmation.
Can the Fox ESS ECS 2900 Master operate on its own?
No. The ECS 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.
How many ECS 2900 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.
Can I mix V1 and V2 ECS batteries?
No. V1 and V2 batteries are not interchangeable and cannot be mixed within the same stack. Ensure all modules in a stack are the same version and connector type.
What inverters are compatible with the Fox ESS ECS 2900?
The ECS 2900 is compatible with the Fox ESS H1, H1-G2, KH, H3, and H3 Pro inverters.
DECO Group supplies Fox ESS Energy Cube S battery modules in both Connector Type A and Connector Type B variants 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-based solar and energy storage wholesaler supplying high-voltage battery modules, hybrid inverters, and installation accessories to professional installers and electrical contractors. Our Fox ESS battery range covers both EQ and ECS platforms with master and slave modules in all connector variants. Visit decogroup.co.uk for the full catalogue.
