Victron Energy LiFePO4 Battery 25,6V/200Ah Smart-a25.6V 200Ah 5120Wh LiFePO4 battery with Bluetooth

Overview

The LiFePO4 Battery 25,6V/200Ah Smart-a has the highest energy content of the Smart range: 5120Wh in a 650×237×163mm housing weighing 39kg. It handles up to 400A continuously, with 200A discharge and 100A charge recommended, and an internal resistance of 1.5mΩ. Two units in series form a 10.24kWh 48V block, while twenty units, the maximum per system, reach 102kWh at 24V or 48V. Its M8 terminals are tightened to 14Nm.

• 12.8V and 25.6V LiFePO4 batteries with integrated cell balancing
• Cell voltages and temperature readable via Bluetooth
• Up to 20 batteries per system, up to 102kWh
• Works only with an external Victron BMS
• 2500 cycles at 80% DoD, 92% round-trip efficiency

How it works

Each battery combines LiFePO4 cells, four in series for 12.8V and eight for 25.6V, with a balancing, temperature and voltage control circuit (BTV). The BTV equalises the cells and raises an alarm on low or high cell voltage or temperature, but it does not interrupt current itself. Two 50cm cables with M8 circular connectors pass these signals to an external Victron BMS, which switches loads and chargers off or issues a pre-alarm.

Victron lists seven BMS models for this battery: the smallBMS for small systems without inverter/chargers, the VE.Bus BMS and VE.Bus BMS V2 for systems with MultiPlus or Quattro units, the Lynx Smart BMS 500A or 1000A with contactor and battery monitor for larger systems, and the Smart BMS CL 12/100 and Smart BMS 12/200, which add a current-limited alternator port for vehicles and boats.

Key features

With default settings the BMS gives a pre-alarm when a cell drops below 3.1V, disconnects loads below 2.8V and stops charging above 3.75V or outside the temperature limits. Rated cycle life is 2500 cycles at 80% depth of discharge, 3000 at 70% and 5000 at 50%, with 92% round-trip efficiency. Charging is permitted from +5°C to +50°C and discharging from -20°C to +50°C. The housings are rated IP22 for dry indoor locations.

Installation and compatibility

Up to 20 batteries can be combined in one system, with at most four 12.8V or two 25.6V units in series, for 12V, 24V or 48V banks of up to 84kWh at 12V and 102kWh at 24V or 48V. Batteries in series must have the same capacity and part number, and each one must be fully charged on its own before series connection. The BMS cables of all batteries are daisy-chained, first and last to the BMS.

Mount the batteries indoors in a dry place, upright or on their side but never with the terminals facing down, leaving 20mm free on all four sides for ventilation. Fuse every battery or series string on the positive side and size the cables for the expected system current. For alternator charging, Victron asks for current limiting, for example a DC-DC charger or a BMS with an alternator port.

Monitoring and settings

In the VictronConnect app the battery shows voltage, temperature, individual cell voltages, balance status and time since the last full charge; Instant Readout displays the main values without pairing. The app also handles firmware updates and settings such as the minimum charge temperature (default 5°C). State of charge is not calculated by the battery, so a Lynx Smart BMS, BMV or SmartShunt is needed for it. Recommended charging is 14.2V or 28.4V absorption for two hours, then 13.5V or 27V float.

Questions and answers