Victron Energy LiFePO4 Battery 25,6V/300Ah NG25.6V 300Ah 7680Wh LiFePO4 battery with integrated shunt, IP65

Overview

The LiFePO4 Battery 25,6V/300Ah NG has the highest capacity in the NG range: 7680Wh in an 841×206×205mm housing of about 52kg. It delivers 300A continuously and 600A for 10 seconds, and accepts 300A charge with 450A pulses. Fifty units in parallel, the maximum per BMS, make the 384kWh 24V configuration quoted by Victron, or 2S25P at 48V. The datasheet lists its cell certifications as pending; ECE R10-6 approval is documented.

• 12.8V, 25.6V and 51.2V LiFePO4 models, 100Ah to 300Ah
• Integrated shunt: BMS calculates state of charge
• IP65 housing, mounting brackets included
• Up to 50 batteries per BMS, up to 384kWh
• Self-discharge of 3% per month or less
• Battery firmware updated automatically by the BMS

How it works

Lithium NG batteries contain LiFePO4 cells, a balancing and monitoring circuit and an integrated shunt. Cell voltages, cell temperatures and battery current travel over 50cm M8 cables with high-speed digital communication to an external Victron BMS NG, which calculates state of charge and decides when to switch loads and chargers off. The BMS also detects how many batteries are connected in series and parallel and updates their firmware, so the batteries need no individual setup.

Three BMS models work with NG batteries: the smallBMS NG for small systems without inverter/chargers, the Lynx Smart BMS NG 500A or 1000A with contactor and battery monitor for larger systems, and the VE.Bus BMS NG for systems with VE.Bus inverter/chargers. The BMS models of the earlier Lithium Battery Smart range are not listed for NG batteries.

Key features

The BMS issues a pre-alarm when a cell reaches 3.0V, disconnects loads at 2.8V after at least 30 seconds, and stops charging above 3.6V, below 5°C or above 50°C. Continuous charge and discharge current is 1C on every model, with 10-second pulses of up to 2C. Cycle life is 2500 cycles at 80% depth of discharge and 5000 at 50%, with 92% round-trip efficiency. Self-discharge is 3% per month or less at 25°C.

Installation and compatibility

One BMS can manage up to 50 batteries of 12.8V or 25.6V, or 25 of 51.2V, for banks of up to 192kWh at 12V, 384kWh with 25.6V batteries and 128kWh with 51.2V batteries. A series string may contain at most four 12.8V or two 25.6V batteries of the same capacity and part number, each fully charged on its own beforehand. Up to five BMS units can be paralleled.

Install indoors in a dry place, upright or on the side but never terminals down, with 20mm clearance on all four sides; brackets are supplied and straps can be used instead. Terminal bolts are tightened to 10Nm. Fuse each battery or string on the positive side. With DVCC-controlled Victron chargers and inverter/chargers the charge voltages are set automatically by the GX device.

Monitoring and settings

Data are read through the BMS: every BMS NG model has Bluetooth for VictronConnect, showing cell status, cell voltages, battery current and temperatures, and the Lynx Smart BMS NG adds a GX device connection and the VRM Portal. For chargers without DVCC, Victron recommends 14.2V, 28.4V or 56.8V absorption for two hours and 13.5V, 27V or 54V float. If an external battery monitor is added, set 99% charge efficiency and a Peukert exponent of 1.05.

Questions and answers