FoxESS HS5
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.
Ranking
Specifications
Pros and cons
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.
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.
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.
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.
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.
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.
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.
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.
Alternatives
About the Mira HV25 series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.