The Mira-HV25 is a high-voltage battery module designed for energy storage systems, intended for use with the Mira-BMS controller. This system is built around Lithium Iron Phosphate (LiFePO4) battery chemistry, known for its safety and longevity. A complete system requires at least two Mira-HV25 modules and one Mira-BMS controller, supporting configurations of up to eight Mira-HV25 modules with a single Mira-BMS.
Function Description
The Mira-HV25 serves as the energy storage unit, while the Mira-BMS acts as the central controller for the entire battery system. The Mira-BMS manages the operation of the connected Mira-HV25 modules, ensuring safe and efficient charging and discharging. It also facilitates communication with an inverter, allowing the battery system to integrate into a larger energy setup. The system is designed for both grid-connected and off-grid applications, with features like "Black Start" for initiating the system without grid power.
Important Technical Specifications
Mira-HV25 Battery Module:
- Nominal Capacity: 2.45 kWh
- Maximum Charge Voltage: 58.8 V
- Discharge Cut Voltage: 46.4 V
- Max. Charge/Discharge Current: 48A/48A
- Operating Temperature: -10°C to 55°C
- Storage Temperature: -10°C to 35°C
- Charge/Discharge Efficiency: >95%
- Ingress Protection: IP21
- Protective Class: I
- Cycle Life: >4000 cycles at 25°C and 80% SOH (State of Health)
- Available SOC Range: 3% to 100%
- Weight: 30.2 ± 1 kg
- Dimensions (LWH): 440420122 mm
Mira-BMS Controller:
- Operating Voltage Range: 86.4-500VDC
- Max. Charge/Discharge Current: 48A/48A
- Total Voltage Measurement Accuracy: ±1.0%FSR
- Total Voltage Measurement Channel: 4
- Current Measurement Range: -100A to +100A
- Communication Interfaces: CAN
- Available SOC Range: 3% to 100%
- Charge/Discharge Efficiency: >95%
- Operating Temperature: -10°C to 55°C
- Storage Temperature: -10°C to 35°C
- Humidity: 5% to 95%
- Weight: 6.5 ± 1 kg
- Dimensions (LWH): 440420122 mm
Battery System Specifications (Examples for various module counts):
- 2x Mira-HV25 System:
- Normal Voltage: 102.4V
- Voltage Range: 92.8-117.6V
- Weight (Net/Gross): 66.7±1kg / 73.5±1kg
- 8x Mira-HV25 System:
- Normal Voltage: 409.6V
- Voltage Range: 371.2-471.0V
- Weight (Net/Gross): 235.5±1kg / 256.7±1kg
- Common System Specifications:
- Normal Capacity (Ah): 48Ah (per module stack)
- Recommended Charging Current: 24A
- Max. Charge/Discharge Current: 48A
- CC-CV Charging Cut-off Current: 3A
- Peak Charge/Discharge Current (30s): 60A
- Operating Temperature (Charge/Discharge): 0°C~55°C / -10°C~55°C
- Storage Temperature: -10°C~35°C
- Cycle Life: ≥4000 at 25°C and 80%SOH
- Ingress Protection: IP21
- Protective Class: I
- Communication Interfaces: CAN
- Altitude: <2000m
- Pollution Degree: PD2
Usage Features
- Safety Protections: The system incorporates multiple protection systems, including inverter interface protection (over voltage, over current, external short circuit, reverse polarity, ground fault, over temperature, inrush current) and battery protection (internal short circuit, over voltage, over current, over temperature, under voltage).
- Modular Design: The system is scalable, allowing for 2 to 8 Mira-HV25 modules to be connected in series with a single Mira-BMS. For systems with more than 4 modules, they must be separated into multiple stacks, with each stack containing a maximum of 1 BMS and 4 battery modules.
- Communication Ports: Mira-HV25 modules feature two CAN communication units (CAN-1 and CAN-2) for series operation, enabling master and slave control. The Mira-BMS also has CAN communication for inverter connection.
- LED Indicators:
- Power LED (Green): Indicates normal operation (ON) or boot/upgrading status (flashing).
- Alarm LED (Red): Indicates abnormal operation (ON) or alarm/fault conditions (flashing).
- SOC LED (Mira-BMS): Displays battery system power and specific alarm information.
- DC Switch: A power switch on the Mira-BMS controls the battery charge and discharge circuit.
- POWER Switches (Mira-BMS): System power on switch.
- B-Start Switches (Mira-BMS): Black start switches for initiating the battery system when there is no grid.
- Automatic Address Assignment: For first-time power-on, the Mira-BMS automatically assigns module addresses to Mira-HV25 units, eliminating manual configuration.
- Grounding: Dedicated earth terminals are provided on both the Mira-HV25 and Mira-BMS for safety grounding.
- Installation: Modules are designed for horizontal insertion into brackets, with connecting buttons for stacking. Clearances of at least 300mm are required around the battery pack for natural convection cooling.
Maintenance Features
- Regular Checks: Users are advised to regularly check the battery's service environment, ensuring it meets requirements and is away from heat sources.
- Charging Recommendations: The battery needs to be charged if it is frequently undercharged, or if it has been out of use or stored for more than 3 months.
- Cable and Terminal Inspection: Regular checks of battery and supporting terminals, connecting cables, and indicator lights are recommended.
- Troubleshooting Guide: The manual provides a detailed troubleshooting section based on LED status indicators (Green LED, Red LED, LED4-1) for both Mira-HV25 and Mira-BMS, helping to identify and address issues such as under/over voltage, temperature faults, communication failures, and fuse faults.
- Problem Determination Steps: Includes checks for green light on the power switch, buzzer status, communication with the inverter, and battery output voltage.
- Preliminary Determination Steps: Guides users on what to do if the battery system doesn't work, including checking LED displays, CAN communication cables, and contacting the local distributor for alarm information.
- Qualified Personnel: All installation, commissioning, maintenance, and troubleshooting tasks must be performed by authorized and qualified technicians. The manual emphasizes that only Fox (the manufacturer) is allowed to carry out repairs.
- Handling Precautions: Instructions include not exposing the battery to open flame, direct sunlight, or flammable materials; storing in a cool, dry, ventilated place; avoiding water contact; and handling with insulated gloves.
- Emergency Response: Guidelines for fire situations (disconnecting power, using specific extinguishers, evacuating) and water situations (not opening submerged batteries, contacting personnel).
- Exclusion of Warranty: The warranty does not cover defects from normal wear and tear, inadequate maintenance, improper handling or storage, unauthorized repairs, failure to follow product specifications, or force majeure events.
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