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Fox ESS ECS4100 4.03kWh HV Battery (Slave) V2
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FE-HV-ECS-4100 | 4.03kWh high-voltage LiFePO₄ slave battery module for Fox ECS4100 stacks, expanding total storage up to 28.21kWh under a single master.
Key Features
- Slave module for the Fox ECS4100 high-voltage battery system (used together with one ECS4100 master).
- 4.03kWh nominal capacity with 90% depth of discharge for high usable energy per module.
- Scalable system: 1× master + up to 6× ECS4100 slaves for 28.21kWh total storage.
- LiFePO₄ chemistry for long cycle life, high safety and wide operating temperature range.
- Plug-and-play, stackable “Energy Cube” design with buckle fixing for quick installation.
- CAN/RS485 communication between modules and to Fox ESS hybrid/AC inverters.
- IP65 ingress protection for indoor or outdoor installation.
Battery Specifications (per Slave Module)
| Battery Type | Lithium Iron Phosphate (LiFePO₄) |
| Nominal Energy | 4.03kWh (≈ 4030Wh) |
| Usable Capacity (90% DoD) | ≈ 3.63kWh |
| Nominal Voltage (single module) | ≈ 52V |
| Depth of Discharge | 90% |
| Recommended Charge/Discharge Current | 25A |
| Max Charge/Discharge Current | 50A |
| Peak Discharge Current | 65A for 30 seconds |
| Round-trip Efficiency | >95% |
| Cycle Life | >6000 cycles at 90% DoD (25°C) |
System Configuration (with Master)
| Minimum Configuration | 1× Master + 1× Slave (8.06kWh nominal) |
| Maximum Configuration | 1× Master + 6× Slaves (28.21kWh nominal) |
| Nominal Stack Voltage | ≈115.2V to 403.2V (depending on number of modules) |
| Operating Voltage Range | ≈97.2–459.9V across 1–7 modules |
| Communication | CAN / RS485 daisy-chained through the stack |
Mechanical & Environmental
| Dimensions (W × H × D) | ≈ 570 × 350 × 380 mm (per module) |
| Weight | ≈ 38 kg |
| Ingress Protection | IP65 |
| Operating Temperature | -10°C to +55°C |
| Storage Temperature | -20°C to +55°C |
| Cooling | Natural convection |
| Installation | Floor‑standing stack, interlocked beneath/above other ECS4100 modules |
Compatibility & Warranty
- Must be used with an ECS4100 master battery; cannot operate on its own.
- Compatible with Fox ESS HV hybrid inverters (H series) and AC chargers (AC series) designed for ECS batteries.
- Typical warranty: 10 years when installed and registered according to Fox ESS requirements.
MPN: FE-HV-ECS-4100
Model: Fox ECS4100 4.03kWh High Voltage Battery (Slave) V2
Modular high‑voltage slave battery for Fox ECS4100 systems, enabling simple, stepwise expansion from 8kWh up to more than 28kWh of safe, long‑life storage.
- Type Solar
- Vendor Fox ESS
- SKU FE-HV-ECS-4100
Please note: Delivery times may vary depending on location, with specific details outlined below.
Standard Delivery
UK Mainland
- Delivery Time: 2–4 working days
- Free Delivery on most orders
- £4.95 for small items
- £69 for Solar Panels, Batteries and other specialized large items delivery
Express Delivery
UK Mainland
- Delivery Time: 1–3 working days
- Free Delivery
- £4.95 delivery for small items
Channel Islands
- Postcodes Covered: GY*, IM*, JE*
- Minimum Order: £50
- Delivery Fee: £70
Northern Ireland, Offshore Territories & Scottish Islands
- Postcodes Covered: BT*, HS*, KW, ZE
- Minimum Order: £50
- Delivery Fee: £35
Same Day Delivery
- Eligible Postcodes:
E*, EC*, N*, NW*, SE*, SW*, W*, WC*, HA*, UB*, EN*, IG*, RM*, KT*, SM*, CR*, BR*, DA*, TW* - Minimum Order: £50
- Same Day Delivery Fee: £70
- Special Requests or Locations:
For areas outside these postcodes or urgent quotes, please email orders@qualityheating.co.uk and we’ll do our best to accommodate.
Collections
Want to collect your order instead?You’re welcome to do so — just email us at orders@qualityheating.co.uk or message us via WhatsApp with your preferred collection time, and we’ll confirm the details.
Collection address: 284 Water Rd, Unit 9, London, HA0 1HX
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