Fox ESS EP5 – 5.18kWh High Voltage LiFePO₄ Battery Module

The Fox ESS EP5 is a high-performance lithium battery designed for seamless integration with Fox hybrid and AC inverters. Built using advanced LiFePO₄ prismatic cells, this high-voltage storage solution offers safe, efficient, and scalable energy storage for both residential and commercial solar systems.

With 90% depth of discharge and round-trip efficiency over 95%, the EP5 delivers maximum usable capacity and long-term reliability. The system can be expanded up to four modules in parallel, reaching a total of 20.8kWh of usable energy storage.

This battery is compatible with the full Fox ESS range including H1, KH, H3, and H3-Pro series, making it ideal for grid-tied, hybrid, and off-grid installations where performance and flexibility are essential.

Authorised retailer of Fox ESS.

• 5.18kWh nominal energy with 90% usable capacity (DoD)
• Compatible with Fox H1, KH, H3 and H3-Pro hybrid inverters
• Scalable system: connect up to 4 modules (20.8kWh max)
• High efficiency: >95% round-trip performance
• Peak discharge current: 65A (60s), 32.4A (5s)
• Advanced lithium iron phosphate (LiFePO₄) prismatic cells
• Integrated CAN communication and LED status indicators
• IP65-rated for indoor or outdoor wall/floor mounting
• Natural convection cooling with no active fans
• 4000+ cycle lifespan for long-term energy use
• Certified to IEC62619, UN38.3, EMC standards
• Operating temperature: charge 055°C, discharge -1055°C

Warranty Coverage:
10-year limited warranty (or 4000+ cycles)
Certified and supported by Fox ESS authorised distribution channels

Specifications

Nominal energy: 5.18kWh
Battery type: LiFePO₄ prismatic
Nominal voltage: 192V
Operating voltage: 174–219V
Max. charge/discharge current: 27A
Peak discharge current: 65A (60s)
Installation: Wall or floor mount
Dimensions: 380 x 625 x 147 mm
Weight: 50.5 kg
Protection rating: IP65
Communication: CAN
Cooling: Natural convection

Designed for long-lasting performance and seamless solar integration, the Fox ESS EP5 is the ideal battery module for smart energy systems.

 

Warranty Policy

BATTERY WARRANTY POLICY
Version 4.2 – 23rd December 2024
FoxESS Co., Ltd – No. 8, Xiqin Rd, Xinwu District, Wuxi, China, 214000
UK & Ireland Only

i. Scope of Warranty
FoxESS provides this limited warranty for its battery products (referred to as the Product(s) unless explicitly stated otherwise). FoxESS reserves the right to decline replacement if the terms of this Policy are breached. This Policy applies in all countries where the Product is sold through recognised FoxESS partners. Covered Products include: Mira HV25, HV2600, ECS2900, ECS4100, ECS4300H, ECS4800, EQ4800, EQ2900, EQ4300, EQ5000, EP3, EP5, EP11, EP5-H, EP11-H.

Please note: this warranty applies only to battery modules. Inverters and charge controllers are covered under a separate policy. This warranty does not cover external or ancillary parts unless stated otherwise. The Policy is not a guarantee of product durability or ability and applies only to the parties listed in section 2. It is effective only for purchases made after the policy’s effective date.

ii. Contracting Parties
This Policy is provided only to the original purchaser of the product from FoxESS (Purchaser), where the Purchaser is a distributor, solar retailer, or accredited electrician (Installer) who supplies the product to another party, or to the End-User where the product is installed.

iii. Warranty Period and Warranty Extension
The standard warranty period for all listed products is sixty (60) months from the installation date, or sixty-five (65) months from the date of manufacture (whichever comes first).

Free Warranty Extension
For ECS2900, ECS4100, ECS4300H, ECS4800, EQ4800, EQ2900, EQ4300, EQ5000: if registration is completed via the FoxESS website within thirty-six (36) months from the manufacturing date, and the product is connected to the Fox Cloud via a Fox datalogger, an additional eighty-four (84) months of warranty will be granted.

For Mira HV25, HV2600, EP3, EP5, EP11, EP5-H, EP11-H: under the same conditions, an additional sixty (60) months of warranty will be granted.

iv. Scope of Warranty
FoxESS’s liability under this Policy is limited to replacement, repair, refund, and compensation. Repaired or replaced products remain under the original performance warranty period. Replacement does not renew the original warranty term.

v. Performance Warranty Terms
For ECS2900, ECS4100, ECS4300H, ECS4800, EQ4800, EQ2900, EQ4300, EQ5000: warranty ensures the product retains at least 70% of nominal energy for 12 years from installation or until a minimum energy throughput is reached (whichever comes first).

For Mira HV25, HV2600, EP3, EP5, EP11, EP5-H, EP11-H: warranty ensures the product retains at least 70% of nominal energy for 10 years or until a minimum energy throughput is reached.

Nominal energy refers to the initial rated capacity printed on the product label. Warranty is valid only if:

• The ambient operating temperature is between -10°C and 50°C

• Energy throughput is below the following values:

Capacity testing conditions:

• Ambient temperature: 25–30°C

• BMS initial temperature: 25–30°C

• Measurement on DC side

• Charging: 0.5C CC/CV, CV 58.4V (Mira HV25/HV2600), 65.7V (ECS2900 etc.), 51.1V (ECS4800), cutoff current 0.05C

• Discharging: 0.5C CC/CV, cutoff 46.4V (Mira), 52.5V (ECS2900 etc.), 40.6V (ECS4800)

vi. Policy Claim Eligibility
Only the Installer and FoxESS authorised personnel can submit warranty claims. If the Installer is no longer available or the location is remote, a Local Installer may be appointed. Service rebate eligibility is outlined in Sections 5 and 6.

vii. Limited Liability
Warranty does not cover damages caused by:

• Poor ventilation or cooling

• Installation by unauthorised personnel

• Incorrect commissioning or operation

• Faulty wiring or connector incompatibility

• Physical damage during installation

• Damage from other system components

• Force majeure events (e.g., storm, lightning, fire, flood)

• Transportation damage

• Cosmetic issues not affecting function

• Unauthorised repairs

• Failure to follow safety and installation instructions

• Lack of 300mm clearance around the battery

viii. Product Replacement and Compensation
If the Product is no longer available, FoxESS may replace it with an equivalent alternative. Functional and specification deviations may occur.

ix. Exclusions
This Policy does not apply to components not originally supplied by FoxESS, even if of the same brand and model.

x. Registration
Product registration is recommended to qualify under this Policy. It must be completed within thirty-six (36) months of installation, ideally within six (6) weeks. Required information:

1. Product model

2. Product serial number

3. Installation date

4. Customer name

5. Installation postal/zip code

6. Full installation address

7. Installer company name

xi. Warranty Claim Process
The Installer must contact FoxESS in case of a fault with the following details:

• Installer name

• Product model number

• Fault code

• Description of the fault

• Contact details

FoxESS may request additional info or photos. An RMA Form must be submitted. Upon approval, a unique ticket number is issued and, subject to availability, a replacement will be dispatched within 3 working days. The faulty unit must be returned to FoxESS within 30 days after replacement, or service rebate eligibility will be forfeited.

If the returned unit is not faulty or excluded from warranty, a flat inspection fee or replacement cost will be charged. All replacements must be approved by FoxESS in advance.

xii. Further Rights at Law
In addition to this warranty, consumers have statutory rights which cannot be excluded under local laws.

Contact Information
FoxESS Co., Ltd
8, Xiqin Road, Xinwu District, Wuxi City, Jiangsu Province, China, 214000
Email: service@fox-ess.com
Website: www.fox-ess.com