The Fox ESS PowerQ EQ4000 is a high-voltage, modular LiFePO₄ (LFP) battery designed for scalable residential energy storage systems. Built for seamless integration with the PowerQ all-in-one inverter platform, it offers plug-and-play installation, flexible expansion, and reliable backup performance.
Original price was: $1,750.00.$1,620.00Current price is: $1,620.00.
Product details
The Fox ESS PowerQ EQ4000 is a high-voltage, modular LiFePO₄ (LFP) battery designed for scalable residential energy storage systems. Built for seamless integration with the PowerQ all-in-one inverter platform, it offers plug-and-play installation, flexible expansion, and reliable backup performance.
Description
🔋 Fox ESS PowerQ EQ4000 — Modular Energy Storage Battery
The Fox ESS PowerQ EQ4000 is a high-voltage, modular LiFePO₄ (LFP) battery designed for scalable residential energy storage systems. Built for seamless integration with the PowerQ all-in-one inverter platform, it offers plug-and-play installation, flexible expansion, and reliable backup performance.
⚡ Key Features
- 3.97 kWh usable capacity per module
- Stackable design (2–5 modules per stack) → up to 19.85 kWh per stack
- Expandable up to 4 stacks (79.4 kWh total system capacity)
- Lithium Iron Phosphate (LFP) chemistry → enhanced safety & lifespan
- 90% Depth of Discharge (DoD) for maximum usable energy
- >95% round-trip efficiency (high performance)
- Wide operating temperature range for real-world conditions
- CAN communication for seamless system integration
- Plug-and-play installation → reduces install time
⚡ Core Technical Specifications
| Specification | Details |
|---|---|
| Battery Type | LiFePO₄ (LFP) |
| Capacity | 3.97 kWh |
| Voltage Range | Up to ~459.9V |
| Max System Size | 79.4 kWh |
| Efficiency | >95% |
| Depth of Discharge | 90% |
| Communication | CAN |
| Installation | Indoor / Outdoor (IP-rated system) |
| Warranty | ~12.5 Years |
🧩 System Compatibility
⚠️ Important:
This battery module is designed exclusively for use with the Fox ESS PowerQ AIO inverter system.
- Requires PowerQ H1-11.4-US inverter (1 per stack)
- Optional Fox Hub G2 for:
- Smart load management
- Generator integration
- Advanced system control
🔄 Scalability & Use Cases
This system is built for flexibility:
🏠 Residential Backup
- Partial or whole-home backup
- Seamless power during outages
⚡ Load Shifting (TOU Optimization)
- Store cheap/off-peak energy
- Use during peak rate periods
🌞 Solar Self-Consumption
- Store excess solar generation
- Reduce grid dependency
🛡️ Certifications & Compliance
The Fox ESS EQ4000 is built to meet North American safety and grid compliance standards, which is critical for permitting, inspections, and long-term reliability.
✅ Safety Certifications
- UL1973 – Battery energy storage system safety
- UL9540 – Energy storage system certification (ESS + inverter compatibility)
- UL9540A – Fire safety & thermal runaway testing
📜 Warranty
🕒 Standard Warranty: 12.5 Years
- Manufacturer-backed long-term coverage
- Designed for full lifecycle residential use
🔋 Performance Expectations
- 90% Depth of Discharge (DoD) supported
- >95% round-trip efficiency maintained over lifecycle
👉 Real-world implication:
- Consistent usable energy over time
- Lower degradation vs cheaper lithium chemistries
Why Choose Fox ESS EQ4000?
⚡ 1. True Modular Scalability (Major Advantage)
- Start small → expand later
- Up to 79.4 kWh system capacity
👉 Perfect for:
- DIY kits
- Customers upgrading over time
🔌 2. Plug-and-Play Architecture
- Stackable design
- Minimal wiring complexity
- Faster install vs traditional HV battery systems
👉 This reduces:
- Labor cost
- Install time
- Failure points
🔥 3. LFP Chemistry (Safer + Longer Life)
- No cobalt
- Higher thermal stability
- Lower fire risk
👉 This is why it passes UL9540A fire testing
📈 4. High Efficiency Performance
- >95% round-trip efficiency
- Minimal energy loss
👉 More usable energy = better ROI for customers
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