Fox ESS EP11-H 10.36kWh Battery with Heating Element

Fox ESS EP11-H: The Robust 10.36kWh Heated Battery for Large-Scale Residential and Commercial Storage

The Fox ESS EP11-H is a high-capacity, high-voltage battery designed for installations that demand reliable storage across all seasons. With over 10kWh of usable energy per unit, an integrated heating system, and IP65-rated protection, it’s ideal for larger homes, commercial buildings, and solar systems with significant daily consumption.

Cold Weather Performance with Built-In Heating

Like its smaller counterpart, the EP11-H includes a built-in heating function that allows safe charging and discharging even in harsh sub-zero conditions. This ensures uninterrupted operation during UK winters, improving system uptime and performance when you need it most.

• Charge and discharge down to –25°C with heating enabled
• Perfect for outdoor or unheated installations
• Operates reliably from –25°C to +55°C

Scalable Storage for High-Demand Systems

Each EP11-H module stores 10.36kWh and can be paralleled up to four units, offering a total capacity of 41.4kWh. This makes it suitable for larger homes, commercial premises, and off-grid setups needing extended autonomy and full-depth discharge.

• Up to 41.4kWh with 4 units in parallel
• Compact footprint: 710 × 625 × 147 mm
• Flexible mounting: wall or floor

Efficient, Long-Life LFP Technology

Built with premium prismatic LiFePO₄ cells, the EP11-H delivers outstanding cycle life, high energy efficiency, and low degradation over time. According to the datasheet, it supports ≥4000 cycles at 90% depth of discharge with round-trip efficiency of ≥95%, ensuring long-term performance and lower cost per kWh stored.

• ≥95% round-trip efficiency for minimal losses
• ≥4000 cycles at 90% DoD
• 10-year manufacturer warranty

Engineered for Safety, Indoors or Out

The EP11-H is IP65-rated for installation indoors or out, with passive natural cooling and certifications for safety, transport, and EMC compliance. It meets IEC62619 and UN38.3 standards, with no active fans or moving parts, ensuring silent, low-maintenance operation across its lifetime.

• IP65 enclosure for outdoor reliability
• Certified to IEC, UN and EMC standards
• Silent natural convection cooling – no fans required

Why Evergy Recommends This Product

The EP11-H is an ideal choice for customers seeking a large, expandable battery that will perform in real-world UK conditions. It’s compatible with the full Fox ESS hybrid inverter range and is perfect for homes or businesses looking to maximise self-consumption or increase energy independence.

• Trusted for cold climates and high usage patterns
• Integrates seamlessly with Fox ESS hybrid inverters
• Also see the EP5-H for smaller setups

Ideal for Larger Homes & Light Commercial Use

This battery is well suited for high-consumption properties with electric heating, EV charging, or daytime commercial operations. It supports off-grid applications, peak shaving, and time-of-use optimisation strategies.

Key Technical Specifications

• Nominal Energy: 10.36 kWh
• Dimensions: 710 × 625 × 147 mm
• Weight: 99 ± 2 kg
• Operating Temp: –25°C to +55°C (with heating)

Full technical specifications are available via the data sheet and product tab.

Pair with the Full Fox ESS System

The EP11-H performs best when paired with our recommended solar panels, mounting systems, and optimisation tools. You can also explore relevant incentives in our solar funding guide or compare battery options in our best battery blog.

FAQs

Q: Can I use the EP11-H in a garage or outdoor shed?
A: Yes – it’s IP65 rated and supports both indoor and outdoor wall or floor mounting.

Q: How does the heating system work?
A: The integrated heater activates automatically in cold temperatures to protect battery health and ensure full charge/discharge functionality.