Fox ESS ECS4100 20.15kWh High-Voltage Battery Stack (1 x Master + 4 x Slave)
The Fox ESS ECS4100 20.15 kWh battery stack (package part number FE-HV-EC-5-4.1-20.5) is a pre-configured 5-module high-voltage LiFePO₄ battery stack comprising 1 x ECS4100 Master (FE-HV-ECM-4100) and 4 x ECS4100 Slave (FE-HV-ECS-4100) modules, all Version 2 with Connector Type B. The stack delivers 20.15 kWh of nominal capacity at 288 V with 90% depth of discharge. The stack can be expanded with up to 2 additional ECS4100 Slave modules for a maximum of 28.21 kWh. No inverter is included in this package. Available from DECO Group, a UK-based solar wholesaler for professional trade installers.
Package Contents
- 1 x Fox ESS ECS4100 4.03 kWh HV Battery Master V2 Connector B (FE-HV-ECM-4100)
- 4 x Fox ESS ECS4100 4.03 kWh HV Battery Slave V2 Connector B (FE-HV-ECS-4100)
Stack Specifications (5 Modules)
- Part number: FE-HV-EC-5-4.1-20.5
- Battery chemistry: LiFePO₄
- Version: V2, Connector Type B
- Total nominal capacity: 20,150 Wh (20.15 kWh)
- Stack voltage: 288 V
- Depth of discharge: 90%
- Continuous discharge rate: 14,400 W
- Maximum discharge rate (5 minutes): 14,400 W
- Surge discharge rate (15 seconds): 18,720 W
- Maximum charge rate (5 minutes): 14,400 W
- Communication: CAN / RS485
- Expandable: Up to 2 additional Slave modules (maximum 7 modules / 28.21 kWh per stack)
- Dimensions (5-module stack): 570 x 710 x 380 mm (W x H x D)
- Weight: 177.45 kg
Key Features
- 20.15 kWh pre-configured battery stack with LiFePO₄ chemistry and 90% usable depth of discharge
- Expandable with up to 2 more ECS4100 Slave modules (V2 Connector Type B) to reach 28.21 kWh
- High-voltage 288 V stack architecture for reduced losses and improved system efficiency
- 14,400 W continuous discharge with 18,720 W surge capability
- Plug-and-play modular design for fast installation
- CAN/RS485 communication for system integration
- All V2 Connector Type B for guaranteed compatibility within this stack
System Compatibility
- Compatible with Fox ESS H1, H1-G2, KH, H3 Smart, H3, and H3 Pro inverters
- No inverter is included in this package; order separately
- This 5-module stack meets the minimum battery requirements for all compatible Fox ESS inverters (including the 3-module minimum for H3 and H3 Pro)
- Expandable: add up to 2 more ECS4100 Slave modules to reach the 7-module stack maximum (28.21 kWh)
Installation Notes
- Total stack weight: 177.45 kg. Each module must be lifted individually (Master 38.25 kg, Slave 34.8 kg each); two-person lift required per module.
- Stack dimensions at 5 modules: 570 x 710 x 380 mm (W x H x D)
- Additional ECS4100 modules can be added post-installation
- 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.
Is an inverter included in this package?
No. This is a battery-only stack package. A compatible Fox ESS hybrid inverter or AC charger inverter must be ordered separately.
Can I add more batteries to this stack later?
Yes. Up to 2 additional ECS4100 Slave modules (V2 Connector Type B) can be added, expanding the stack from 5 modules (20.15 kWh) to the maximum of 7 modules (28.21 kWh).
What inverters are compatible with this battery stack?
This stack is compatible with Fox ESS H1, H1-G2, KH, H3 Smart, H3, and H3 Pro inverters. The 5-module configuration exceeds the minimum battery requirement for all compatible models.
What is the total weight of this battery stack?
The 5-module stack weighs 177.45 kg total. Each module is lifted individually: the Master at 38.25 kg and each Slave at 34.8 kg. A two-person lift is required per module.
DECO Group supplies Fox ESS ECS battery stacks in various pre-configured sizes alongside individual master and slave modules, compatible hybrid inverters, AC charger inverters, and system accessories. Browse our Fox ESS battery storage catalogue for complete scalable storage configurations.
About DECO Group
We are a UK-based solar and energy storage wholesaler supplying pre-configured battery stacks, hybrid inverters, and installation accessories to professional installers and electrical contractors. Our Fox ESS ECS range is available as individual modules or pre-matched stacks for streamlined ordering. Visit decogroup.co.uk for the full catalogue.
