Fox ESS ECS4000 Battery CS4000 | Sub LFP Stackable Batteries With Full Capacity 3.975kWh
- Stackable design, plug and play setup
- High efficiency: 6000+ cycles@90%DOD
- Expandable system, flexible customize to 19.87kWh
- BMS and cable set build-in, no wring cable needed
- IP65, indoor or outdoor installation
- 12.5 years warranty
See the specs >
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The CS4000 is a LiFePO₄ (lithium iron phosphate) battery slave module within the ECS4000 series. It pairs with a CM4000 controller module to form scalable battery stacks—each CS4000 adds ~3.97 kWh of capacity.
Key Features
- High Voltage, High Performance: Enables scalable stacks up to ~459.9 V
- Plug-and-Play Design: Snap-fit modules with CAN bus communication simplify installation
- Safety & Certifications: UL1973, UL9540, UL9540A, UN38.3 certified; outdoor-rated IP65 enclosure
- Long Warranty: 12.5 years standard
System Configurations (ECS4000 Series)
| Modules (1 CM + N CS) | Capacity (kWh) | Nominal Voltage (V) | Voltage Range (V) |
|---|---|---|---|
| H2 (1 + 1) | 7.95 | 115.2 | 97.2–131.4 |
| H3 (1 + 2) | 11.9 | 172.8 | 145.8–197.1 |
| H4 (1 + 3) | 15.9 | 230.4 | 194.4–262.8 |
| H5 (1 + 4) | 19.9 | 288 | 243–328.5 |
| H6 (1 + 5) | 23.8 | 345.6 | 291.6–394.2 |
| H7 (1 + 6) | 27.8 | 403.2 | 340.2–459.9 |
Use Cases
- Ideal for residential and small commercial storage, scaling from ~8 kWh up to ~28 kWh
- Compatible with Fox H1-series hybrid inverters and other high-voltage systems
- Outdoor-ready, suitable for rooftop, garage, or ground-level battery setups
Shipping and Packaging
- The battery can only ship via freight truck
Download
Datasheet
FoxESS ECS4000 Datasheet
User Manual & Installation Guide
FoxESS ECS4000 User Manual
FoxESS ECS4000 Installation Quick Guide
Certification
Fox ECS4000-UL-9540A
HUB &WiFi
Fox Hub-G2 Datasheet
Fox Smart WiFi Datasheet
FoxESS Cloud User Manual
About FOX ESS
FOX ESS is a leading provider of advanced energy storage solutions that empower customers to optimize their energy usage, reduce their carbon footprint, and enhance their energy independence. Founded in 2016, 15% of FOX ESS staff are engineers with a core R&D center base in Shang Hai. FOX ESS has developed a wide range of energy storage products and services that cater to the needs of various industries, including residential-use, utilities, commercial and industrial customers. FOX ESS is committed to delivering innovative, reliable, and cost-effective energy storage solutions that meet the evolving needs of the energy market. With a global team of experienced engineers and energy experts, the primary markets of FOX ESS include Germany, Italy, the UK, Brazil, Poland, and the US.
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