--- title: "FoxESS HS5 4.76 kWh Battery: Specs & Datasheet | ComparePV" description: "FoxESS HS5 4.76 kWh home battery. Specs: 6000 cycles, 10 yrs warranty." source: "https://comparepv.com/battery/foxess-hs5" updated: 2026-01-11 --- # FoxESS HS5 ## Identity - **Manufacturer:** FoxESS - **Model:** HS5 - **Series:** Mira HV25 - **Usable energy:** 4.76 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% | | | | Power per kWh | - | 0.98 | | | | Cycle life | 6000 | 6000 | Typical | 2 | | Weight per kWh | - | 11.1 | | | | Warranty | 10 yrs | 10 yrs | Typical | 1 | ## Specification ### Capacity - **Usable energy:** 4.76 kWh - **Nominal energy:** 4.91 kWh - **Module energy:** 2.45 kWh - **Modules per stack:** 2 to 8 - **Max system capacity:** 19.6 kWh ### Power - **Max discharge current:** 48 A - **Max charge current:** 48 A - **Peak discharge current:** 60 A ### Efficiency and lifetime - **Cycle life:** 6000 cycles ### Cells and voltage - **Voltage class:** High voltage - **Nominal voltage:** 102.4 V - **Operating voltage:** 86 to 117 V - **Cell technology:** LFP - **Cell management:** Cobalt-free ### Physical - **Enclosure:** IP21 - **Mounting:** rack - **Cooling:** passive - **Operating temperature:** -10 to 55 °C ### Compatibility - **Compatible inverters:** FoxESS Hybrid Inverter (seria HS; kompatybilność wskazana w tabeli) - **Protocols:** CAN ### Warranty and certificates - **Warranty:** 10 years - **Certifications:** IEC 62619, IEC 62477-1, EN IEC 61000-6-1/2/3/4 (EMC), UN38.3 (transport) ### Pros - **≥6000 cycles - as confirmed by the datasheet** - The official datasheet for V3.3 confirms ≥6000 cycles at 0.5C, 25°C to 80% SOC. This is a value significantly higher than the typical 4000-5000 cycles declared by comparable entry-level LFP modules (e.g., BYD HVM), which translates to an estimated energy lifespan of >14,000 kWh per 2.45 kWh module. - **Modular expansion, from 2.45 to 19.66 kWh** - The system allows for the connection of 2 to 7 HV25 modules in a single chain with a dedicated BMS, achieving a maximum of 19.66 kWh without the need to replace any previously installed components. The option to purchase individual modules later on lowers the initial investment threshold and provides greater flexibility in the investment timeline. - **Round-trip efficiency >95%** - The datasheet specifies a charging/discharging efficiency of >95% (with some distributors reporting even 98%), at a depth of discharge (DoD) of up to 90% (SOC 3-100%). In comparison to similar products (e.g., Pylontech Force H2: ~95%), this figure places the Mira HV25 in the upper quartile of the residential HV segment. - **Broad compatibility with the FoxESS ecosystem** - The module is compatible with the entire FoxESS inverters range: H1, H3, AC1, AC3, KH, and KA. Communication via a dedicated BMS with a CAN interface ensures seamless integration with energy management systems and monitoring through the FoxESS Cloud app, without the need for external gateways. - **10-year manufacturer's warranty** - FoxESS offers a 10-year warranty on Mira HV25 modules (activation via the manufacturer's portal). The manufacturer has a Tier-1/bankable status (BNEF), which reduces counterparty risk and realistically increases the likelihood of warranty service throughout the declared period. ### Cons - **Only IP21 - strictly for indoor installations** - IP21 rating indicates protection only against vertical water splashes and limited protection against dust. The battery cannot be installed in unheated garages, damp rooms, or outdoors - unlike competing models with IP55 rating (e.g., Huawei LUNA2000-S1), which significantly restricts the installation locations. - **A self-contained ecosystem - only FoxESS inverters** - The Mira HV25 is not compatible with inverters from other manufacturers (Fronius, SolarEdge, Growatt). The lack of SunSpec Modbus protocol support at the battery level means that replacing the inverter in the future would require replacing the entire battery system, which increases the risk of being locked into a specific system over the long term. - **Incompatibility with FoxESS HV2600 modules** - The HV25 series cannot be mixed or combined with HV2600 modules in a single installation. Installers upgrading existing systems based on HV2600 must choose between maintaining the existing standard or a complete replacement with HV25, which leads to unnecessary costs during modernization. ## About this series The FoxESS Mira HV25 series comprises high-voltage energy storage modules featuring a cascade structure, designed to be easily adaptable to actual electricity consumption. The main advantage is the **modular scalability** - you start with a basic configuration and then increase capacity by adding more modules in a single string, without replacing the entire battery. The Mira HV25 employs **LiFePO4 (LFP) chemistry**, which practically means higher thermal stability, greater resistance to intensive use, and improved safety compared to typical NMC solutions. This is a particularly sensible choice for daily operation: supporting self-consumption from PV, charging during off-peak tariffs, and feeding energy back at night. The declared **high cycle life**, combined with the warranty, translates into predictable operating costs over the years - the battery is simply meant to work, without demanding attention. Thanks to CAN communication and collaboration with the dedicated BMS, the Mira HV25 integrates well with hybrid FoxESS inverters and serves as a solution for both homes and small businesses, and in the appropriate configuration, also as a backup power supply or an off-grid system component. ## Questions ### What is the capacity of a single FoxESS Mira HV25 module, and what size of system can be built? The single Mira HV25 module offers a capacity of 2.45 kWh. Due to its cascading design, it can be connected in series from 2 to 8 modules, resulting in a total capacity ranging from 4.9 kWh to 19.66 kWh. This means you can start with a smaller set and add more modules later, without having to replace any previously installed components. ### What is the warranty on the FoxESS Mira HV25 battery? FoxESS offers a 10-year warranty on the Mira HV25 series, provided that the product is registered on the manufacturer's website. The stated cycle life is over 4000, and according to some technical sources, even 6000 cycles under standard operating conditions. This translates to over a decade of daily use without the need to replace the batteries. ### Which inverters are compatible with the FoxESS Mira HV25? The Mira HV25 is primarily designed for use with FoxESS hybrid inverters, including both the single-phase H1 series and the three-phase H3 series. Communication is achieved through the CAN or RS485 interface, ensuring full integration with the energy management system. It is advisable to confirm compatibility with the specific firmware version of the inverter with the installer before purchasing. ### Why does the Mira HV25 use LiFePO4 chemistry instead of the more common NMC? LiFePO4 (LFP) batteries are less susceptible to overheating and thermal degradation compared to NMC batteries, which directly translates to improved safety when used in a home or small business setting. When used for daily operation - charging from solar power during the day and discharging energy in the evening - LFP batteries degrade more slowly and are better able to withstand deep charge/discharge cycles, maintaining their capacity throughout the warranty period. ### Is the FoxESS Mira HV25 suitable for backup power or off-grid operation? Yes, the Mira HV25 can function as a backup power source and be part of an off-grid system, but this requires a properly configured hybrid inverter from FoxESS that supports both EPS (Emergency Power Supply) and off-grid modes. With a maximum configuration of 8 modules (19.66 kWh), this is a feasible solution for a home or small commercial building in the event of a power outage. ### What is the depth of discharge (DoD) and the battery efficiency of the FoxESS Mira HV25? The Mira HV25 operates with a discharge depth of 90%, meaning that approximately 2.2 kWh of usable energy is available from the 2.45 kWh module. The charging and discharging efficiency is approximately 98%, which is among the best results in this product category and directly impacts lower losses during daily self-consumption from a PV system. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/batteries/Karta-Katalogowa-MIRA-HV25-2a4f38f88204.pdf) ## Alternatives | Battery | Usable energy | Round-trip | Power | Voltage | Difference | | --- | --- | --- | --- | --- | --- | | [FoxESS EP5](https://comparepv.com/battery/fox-ess-ep5) | 4.66 kWh | 95.0% | | HV | Similar on paper | | [Huawei LUNA2000-5-S0](https://comparepv.com/battery/huawei-luna2000-5-s0) | 5 kWh | | 2.5 kW | HV | +0.2 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 | +0.2 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 | +0.4 kWh | | [FoxESS ECS2900-H2](https://comparepv.com/battery/fox-ess-ecs2900-h2) | 5.18 kWh | 95.0% | | HV | +0.4 kWh | | [Sigenergy SigenStor BAT 5.0](https://comparepv.com/battery/sigenergy-sigenstor-bat-5-0) | 5.2 kWh | | 2.5 kW | HV | +0.4 kWh | | [FelicityESS LUX-E-48100LG03](https://comparepv.com/battery/felicityess-lux-e-48100lg03) | 4.86 kWh | | | LV | +0.1 kWh, low voltage | | [Dyness DL5.0C](https://comparepv.com/battery/dyness-dl5-0c) | 4.61 kWh | 90.0% | 2.6 kW | LV | -0.1 kWh, low voltage | --- Source: https://comparepv.com/battery/foxess-hs5