Fox ESS EP5 High-Voltage 5.18kWh Stackable Battery with Warming Function

The Fox ESS EP5 is a 5.18kWh high-voltage lithium battery designed for scalable, efficient, and low-maintenance residential storage. With support for up to four units in parallel, the EP5 offers flexible storage from 5.18kWh to 20.8kWh — ideal for hybrid and AC-coupled setups. Each module includes an integrated warming circuit to ensure reliable charging even in colder environments.

Why Choose This Product?

• Modular expansion: Scale from 5.18kWh to 20.8kWh using up to four EP5 modules
• Cold climate ready: Built-in warming function prevents low-temp charge faults
• Installer-friendly: Compact housing, plug-and-play wiring, and easy bracket mounting
• Durable cells: Over 6000 cycles at 90% DoD using high-quality LiFePO₄ chemistry
• Efficient charging: >95% round-trip efficiency and 0–55°C operating range
• Seamless integration: Communicates via CAN with Fox ESS H1, H3, KH, and US inverter lines

Performance and Build

Each EP5 module delivers a true 4.66kWh usable capacity (5.18kWh @ 90% DoD), with a rated voltage of 192V. It supports ambient operation from –10°C to 55°C, and charges from 0°C upwards with help from the integrated battery warming system. Passive natural convection cooling ensures maintenance-free reliability without fans or moving parts.

Installation and Integration

Designed for both wall and floor mounting, the EP5 can be installed in a wide range of domestic spaces including utility rooms, garages, and plant enclosures. Its IP65-rated housing protects against dust and moisture, while a plug-and-play terminal layout speeds up deployment. The system connects directly to Fox inverters via CAN and supports remote diagnostics via inverter-linked platforms.

Who is it for?

• Installers: Looking for stackable 5kWh-class batteries compatible with Fox inverters
• Homeowners: With solar arrays up to 10kW needing modular storage
• Colder climates: Properties where low winter temperatures would normally hinder charging

Technical Specifications

Model	EP5
Nominal Energy	5.18kWh
Usable Energy	4.66kWh (90% DoD)
Expandable Capacity	Up to 20.8kWh (4 units)
Nominal Voltage	192V
Voltage Range	174V – 219V
Cycle Life	>6000 cycles
Round-Trip Efficiency	>95%
Cooling	Natural convection
Fire Protection	Integrated fire suppression
Temperature Range	Charge: 0 – 55°C / Discharge: –10 – 55°C
Ingress Protection	IP65
Mounting	Wall or floor
Communication	CAN
Dimensions (W×H×D)	566 × 400 × 221 mm
Weight	44kg
Compatible Inverters Get a Free Quote Our Recent Work Related products Sigenergy Sigen Energy Gateway HomePro SP-F Installed from £1,395.00 Find out more Sigenergy SigenStor 8.76kWh Battery Installed from £3,170.00 Find out more Sigenergy SigenStor 7.8kWh Battery Installed from £2,925.00 Find out more Sigenergy SigenStor 6kWh Battery Installed from £2,453.00 Find out more Sigenergy SigenStor 5.2kWh Battery Installed from £1,625.00 Find out more Eleven 4.5kWh Sodium Battery with Battery Box Installed from £1,890.00 Find out more Ready to Power Up Your Home or Business? Looking for Solar PV, EV chargers, or expert domestic or commercial electrical work? Redhill Services provides safe, efficient, and future-proof solutions. Get in touch today for your free quote! Get a Free Quote Get in touch Get a Free Quote Types of Solar Panels Eurener Premium cost High efficiency & Advanced Tech Lasts 25-40 years Black colour Perlight Monocrystalline Mid-range cost Monocrystalline technology for high output Lasts 25-40 years Black colour Jinko Competitive cost Excellent energy output and reliability Lasts 25-35 years Black or Blue colour Longi Affordable with great value High efficiency for residential & commercial Lasts 25-30 years Black or Blue colour Get a Free Quote Types of Main Batteries/Inverters Fox ESS Cost-effective energy storage High-performing single & three-phase inverters Lasts 10-20 years Black or Silver colour SolaX Inverters Mid-range investment for advanced tech Efficient energy conversion with smart monitoring Lasts 15-20 years White or black casing StorEdge (SolarEdge) Premium pricing for integrated storage Maximises solar self-consumption Lasts 15-25 years Black & grey finish Enphase Storage Scalable pricing based on battery size High-performance modular battery system Lasts 15-25 years Black design Myenergi (Libbi) Mid-range modular system Smart integration with Myenergi products Lasts 10-15 years White & green casing Get a Free Quote Types of Main EV Chargers Zappi EV Charger (Myenergi) Mid-range, feature-rich charger Smart charging with solar integration Lasts 5-10 years White or black colour Ohme Home Pro Mid-range, standard installation included Smart scheduling & dynamic tariff compatibility Lasts 5-10 years Grey/black with an LCD screen Ohme ePod Affordable, compact charger Smart charging with Octopus tariff integration Lasts 5-10 years Black wall-mounted design Hypervolt Chargers Premium charger with smart features Solar compatibility & intelligent energy management Lasts 5-10 years White, black, or grey colour Pod Point Chargers Budget-friendly with standard installation included Smart connectivity with app control Lasts 5-10 years Black & white colour Get a Free Quote