--- title: "FoxESS EP5 4.66 kWh Battery: Specs & Datasheet | ComparePV" description: "FoxESS EP5 4.66 kWh home battery. Specs: 95.0% round-trip efficiency, 4000 cycles, 50.5 kg, 10 yrs warranty." source: "https://comparepv.com/battery/fox-ess-ep5" updated: 2026-01-11 --- # FoxESS EP5 ## Identity - **Manufacturer:** FoxESS - **Model:** EP5 - **Series:** EP (High Voltage Battery System) - **Usable energy:** 4.66 kWh - **Voltage class:** High voltage - **Cell technology:** LFP ## How it compares Compared against 27 batteries up to 6 kWh. Ranks are within that class. | Measure | This battery | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | Round-trip efficiency | 95.0% | 95.0% | Typical | 3 | | Power per kWh | - | 0.98 | | | | Cycle life | 4000 | 6000 | Weak - bottom 3% | 17 | | Weight per kWh | 10.8 | 11.1 | Typical | 12 | | Warranty | 10 yrs | 10 yrs | Typical | 1 | ## Specification ### Capacity - **Usable energy:** 4.66 kWh - **Nominal energy:** 5.18 kWh - **Depth of discharge:** 90 % - **Module energy:** 5.18 kWh - **Max system capacity:** 18.6 kWh - **Units in parallel:** 4 ### Power - **Max discharge current:** 27 A - **Max charge current:** 27 A - **Peak discharge current:** 65 A ### Efficiency and lifetime - **Round-trip efficiency:** 95.0 % - **Cycle life:** 4000 cycles ### Cells and voltage - **Voltage class:** High voltage - **Nominal voltage:** 192.0 V - **Operating voltage:** 174 to 219 V - **Cell technology:** LFP - **Cell management:** Cobalt-free ### Physical - **Dimensions:** 625 × 380 × 147 mm - **Weight:** 50.5 kg - **Enclosure:** IP65 - **Mounting:** wall - **Outdoor installation:** Yes - **Cooling:** passive - **Operating temperature:** -10 to 55 °C ### Compatibility - **Compatible inverters:** Fox ESS H1 series, Fox ESS KH series, Fox ESS H3 series, Fox ESS H3-Pro series, Fox ESS US series - **Protocols:** CAN ### Warranty and certificates - **Warranty:** 10 years - **Certifications:** IEC62619, EN IEC 61000-6-1/3, UN38.3, IP65 ### Pros - **LiFePO4 cells - offer higher safety and lifespan compared to NMC cells** - LFP chemistry offers a thermal runaway temperature of approximately 270°C, compared to ~150°C for NMC batteries, which significantly reduces the risk of fire. The declared cycle life for EP11 is >4,000, while newer versions (EP12) can reach up to 6,000 cycles, providing approximately 11-16 years of active use without the need for replacement under typical operating conditions. - **Efficiency ≥95% and Depth of Discharge (DoD) of 90%** - The datasheet confirms a cyclic efficiency of ≥95% and a DoD (Depth of Discharge) of 90%, meaning that an EP11 module with a nominal capacity of 10.36 kWh actually provides 9.32 kWh - this performance is competitive with, for example, BYD Battery-Box HVM (DoD 90%) and Pylontech FORCE H2 (DoD 90%), placing FoxESS EP at the higher end of the HV segment. - **384V high-voltage architecture** - The nominal voltage of 384V (ranging from 348-438V for EP11) reduces operating currents at the same power level, which translates to lower resistive losses in DC wiring and better compatibility with hybrid HV inverters (e.g., FoxESS H3 PRO, AIO H3). Compared to low-voltage systems (~48V, e.g., Pylontech US5000), it eliminates the need for thicker cable cross-sections in large installations. - **Scalable up to 46 kWh in a single system** - The modular design allows for the connection of up to 4 units in parallel - the EP11 can scale to 41.6 kWh, and the EP12 to 46.08 kWh. It is also possible to add modules over time, without replacing the entire system. This provides the flexibility that is not available, for example, in the Huawei LUNA2000, where the maximum capacity for a single inverter is 30 kWh. - **IP65 + flexible wall or floor mounting** - The IP65 degree of protection allows for installation in garages, boiler rooms, and technical rooms without an external enclosure, and the wall or floor mounting option makes it easy to adapt to different sizes. Some versions (EP11-H, EP12-H) include a heating element, which expands the operating range at low temperatures - a key feature for the climate in central Europe. ### Cons - **A brief company history versus a 10-year warranty** - Founded in 2019, FoxESS offers a 10-year battery warranty, but the company itself has only existed for approximately 6 years. The financial continuity risk associated with the service is higher than that of manufacturers with a long track record (e.g., BYD, founded in 1995, and Panasonic/EnerSys). Institutional investors and installers pay close attention to this lack of a proven track record when assessing the service risk for installations with a lifespan of 15+ years. - **Uneven quality of technical support** - Independent industry-specific services (such as SolarQuotes AU and the FoxESS Community Forum) document instances of delayed or ineffective responses from support departments - including delays in firmware updates, difficulty reaching support via phone or email. This contrasts with established leaders in after-sales support, such as SMA and Victron, and could be a significant constraint for commercial installations with strict service level agreements (SLAs). ## About this series The FoxESS EP (high-voltage system) energy storage series offers a practical solution designed for scalability and easy installation, prioritizing safety without compromise. Its key advantage lies in the **LiFePO4 (LFP)** battery chemistry, valued for its thermal stability, high resistance to overheating, and long lifespan compared to NMC, translating to a more reliable and predictable operation for years in real-world conditions. High efficiency and operation in a high-voltage architecture are also crucial in daily use, enabling seamless integration with modern hybrid systems. The EP system allows for **scalability through adding additional modules** (including in parallel), making it adaptable to increasing energy consumption or larger PV installations. The design benefits from an **enclosure with an IP65 rating** and flexible mounting options (wall or floor). The declared cycle life and long warranty provide real protection for the investment - whether for homes, businesses, or backup and off-grid applications. ## Questions ### What is the warranty on the FoxESS EP energy storage system, and what exactly does it cover? The FoxESS EP series is covered by a standard 10-year warranty. This warranty covers both the performance of the LiFePO4 batteries and the overall function of the battery module. FoxESS is a Tier 1 manufacturer, which means the company has a stable financial position and a real chance of enforcing warranty claims throughout the warranty period. In practice, this translates to the certainty of investment, whether for residential or commercial installations. ### How many charging cycles can the FoxESS EP battery withstand, and for how long will it continue to function properly? Depending on the model, the FoxESS EP series offers over 4000 cycles (EP5, EP11) to over 6000 cycles (EP6) while maintaining the declared capacity. This translates to over 10-16 years of operation with a single daily cycle. The LiFePO4 chemistry is particularly resistant to degradation compared to NMC, so the actual lifespan in home conditions often approaches the upper limit specified by the manufacturer. ### Can the FoxESS EP energy storage system be expanded if I increase the size of my solar panel installation? Yes, the EP series was designed with scalability in mind. Modules can be connected in parallel - for example, the EP11 allows for connection to 4 units, achieving a total capacity of up to 40.8 kWh. This means that you don't necessarily need to purchase the largest system right away: you can start with a single module and expand the storage as your energy consumption or larger PV installation grows. ### Can the FoxESS EP battery be installed outdoors or in an unheated garage? Yes, the EP series enclosure has an IP65 level of protection, which means full protection against dust and water jets. The manufacturer allows both wall and floor mounting, both indoors and outdoors. The operating temperature range is from -10°C to 55°C during discharge, while charging takes place in the range of 0-55°C. Therefore, an unheated garage in a Polish climate is typically an acceptable location. ### What distinguishes the LFP technology used in the FoxESS EP system from older NMC batteries, and why is this important? The LiFePO4 (LFP) batteries used in the EP series exhibit higher thermal stability compared to NMC batteries - they do not undergo self-ignition due to overheating or mechanical damage. This results in safer operation, especially in enclosed spaces. An additional advantage is the slower capacity degradation over the battery's lifespan, which directly translates to a longer, more reliable operational life in everyday use. ### Which inverters are compatible with the FoxESS EP, and will it work with an inverter from a different brand? The FoxESS EP series is designed for high-voltage (HV) applications and is optimized for use with hybrid inverters from FoxESS (e.g., the H3, AIO series). The official list of compatible inverters is specified by the manufacturer. Connecting to inverters from other brands requires prior verification of the BMS communication protocol compatibility - it is advisable to confirm this with the supplier or installer before purchasing. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/batteries/2c16d86a0d695077e7a8024e9eeea638c4b4aee3_Karta_Katalogowa-1b9d28302a78.pdf) ## Alternatives | Battery | Usable energy | Round-trip | Power | Voltage | Difference | | --- | --- | --- | --- | --- | --- | | [FoxESS HS5](https://comparepv.com/battery/foxess-hs5) | 4.76 kWh | | | HV | Similar on paper | | [Huawei LUNA2000-5-S0](https://comparepv.com/battery/huawei-luna2000-5-s0) | 5 kWh | | 2.5 kW | HV | +0.3 kWh | | [GoodWe Lynx D LX D5.0-10](https://comparepv.com/battery/goodwe-lynx-d-lx-d5-0-10) | 5 kWh | | 3.0 kW | HV | +0.3 kWh | | [BYD Battery-Box Premium HVS 5.1](https://comparepv.com/battery/byd-battery-box-premium-hvs-5-1) | 5.12 kWh | 96.0% | 5.1 kW | HV | +0.5 kWh, +1.0 pp round-trip | | [FoxESS ECS2900-H2](https://comparepv.com/battery/fox-ess-ecs2900-h2) | 5.18 kWh | 95.0% | | HV | +0.5 kWh | | [Sigenergy SigenStor BAT 5.0](https://comparepv.com/battery/sigenergy-sigenstor-bat-5-0) | 5.2 kWh | | 2.5 kW | HV | +0.5 kWh | | [Dyness DL5.0C](https://comparepv.com/battery/dyness-dl5-0c) | 4.61 kWh | 90.0% | 2.6 kW | LV | low voltage, -5.0 pp round-trip | | [SolarEdge BAT-05K48 (single module)](https://comparepv.com/battery/solaredge-bat-05k48-single-module) | 4.6 kWh | 95.4% | 5.0 kW | LV | low voltage | --- Source: https://comparepv.com/battery/fox-ess-ep5