Victron LiFePO4 Lithium Battery 25,6V 200Ah NG - BAT524120620

Victron LiFePO4 Lithium Battery 25,6V 200Ah NG - BAT524120620

The Victron LiFePO4 25,6V 200Ah NG lithium battery is a lithium iron phosphate battery, has an IP65 protection rating and has an integrated shunt. It can be connected in parallel, in series or in series/parallel combination. Up to 50 batteries can be connected per BMS NG; the maximum energy storage of this system consisting of 200Ah LiFePO4 NG batteries is 256kWh.

The shunt integrated in the battery records data such as current, voltage and temperature, sends the data to the NG BMS, which evaluates the data to calculate certain parameters and set alarms. The NG lithium battery can be monitored via the VictronConnect App by connecting to the Bluetooth of the NG BMS or with the use of a GX device and the Victron VRM portal.

This lithium battery belongs to Victron's new NG (New Generation) range, which also consists of 12.8V and 51.2V batteries of different capacities.

Victron 25,6V 200Ah NG Battery Specifications

• Rated voltage: 25,6 V
• Rated capacity at 25 °C: 200 Ah
• Rated energy at 25 °C: 5120 Wh
• Loss of capacity: <1 % per 100 cycles, at 25 °C, with a depth of discharge of 100 % of usable capacity.
• Energy loss: <1 % per 100 cycles, at 25 °C, with a depth of discharge of 100 % of usable capacity.
• Full cycle efficiency: 92 %
• Battery connections: Screws M8 (For cables with 8mm round cable lug)
• Cycle life (capacity ≥ 80 % of nominal):
  • 80 % discharge: 2500 cycles
  • 70 % discharge: 3000 cycles
  • 50 % discharge: 5000 cycles
• Internal self-discharge: less than 3 % per month at 25 °C.
• Dimensions: 235 x 648 x 162 mm
• Weight: 37 Kg

Carrying capacity

• Charging voltage: 28.00V - 28.8V
• Floating tension: 27 V
• Maximum continuous load current: 200 A (1C)
• Maximum load current per 10s intervals: 400 A (2C)

Discharge capacity

• Maximum continuous discharge current: 200A (1C)
• Maximum discharge current per 10s intervals: 400 A (2C)
• Voltage at the end of the discharge: 22.4 V (Minimum battery voltage).
• Internal resistance: 2 mΩ

Working conditions

• Working temperature:
  • Load: +5 °C to +50 °C
  • Discharge: From -20 °C to +50 °C
• Storage temperature: From -45 °C to +70 °C
• Humidity (non-condensing): Max. 95 %
• Protection class: IP65

General aspects of the 25.6V 200Ah NG lithium battery to consider

• Independent measurements per cell: Individual cell voltages and temperatures in addition to battery current.
• Specific BMS for the new NG batteries: An NG BMS must be used, such as the Lynx Smart BMS NG 500 A or Lynx Smart BMS NG 1000 A (must be purchased separately).
• Battery BMS interface: Male + female cable with circular M8 connector with high speed digital communication and 50 cm length.
• Bluetooth: NG lithium batteries do not have Bluetooth because it is built into the NG BMS.
• Battery firmware updates: The firmware is automatically updated by the BMS NG.
• Maximum number of batteries: 50 units (maximum total of 384 kWh per BMS NG).
• Repairable: Yes (cover can be removed with screws).
• Safety standards:
  • Cells: UL1973, UL9540A , IEC62619.

Other functions

• High full-cycle efficiency.
• High energy density. These lithium batteries have more capacity with less weight and less volume.
• High charging and discharging currents, allowing fast charging and discharging.

Installation and assembly of the LiFePO4 battery 25,6V 200Ah

This image shows the dimensions of the Victron NG 25,6V 200Ah NG battery:

Installation of the Victron 25,6V 200Ah NG lithium battery:

• It can be mounted vertically or on one side, but not with the terminals facing downwards.
  • Can be fixed with straps or mounting brackets.
  • Mounting brackets secure the battery so that it cannot slide or tip over.
• It should be installed indoors and in a dry place.
• This NG lithium battery weighs 37Kg, so handling equipment must be used to transport it safely.
• A space of 2 cm should be left on all four sides of the battery to allow for ventilation (the battery heats up when discharging and charging).
• It is important to observe polarity when connecting the terminals. The screws should be tightened with a torque of 10 Nm, using a tool specific to the size of the screw. The picture below shows how to connect the wires:

• Installation of BMS NG is mandatory: Lynx Smart BMS NG 500 A or Lynx Smart BMS NG 1000 A (to be purchased separately).
  • The BMS manages all battery parameters. It also automatically detects the system voltage and the number of batteries connected in parallel, in series and in series/parallel combination.
• The system is monitored via the VictronConnect App that connects to the Bluetooth of the BMS NG. If you want to monitor remotely, you need a GX device and the Victron VRM portal.

Connect NG BMS to NG battery 25,6V 200Ah

• All NG lithium batteries have cables to communicate with the NG BMS. One cable has a male and the other a female connector, both with three poles. Depending on the model of the NG battery, the NG BMS cables can be on the same side of the battery or on each side.
  • The BMS battery cables are 50cm long, they can be extended with BMS NG extension cables which must be purchased separately.
  • With only one NG battery in the system, the cables are connected directly to the NG BMS.
  • In systems consisting of more than one lithium battery, all BMS cables are daisy-chained and the first and last cable goes to the BMS NG.

Fuses and Cable cross-section for correct installation of the LiFePO4 25,6V 200Ah NG battery

Each battery must be fitted with a fuse appropriate to the size of the battery cable. The battery cables must be sized to withstand the maximum current of the system.

For more information on sizing, Victron has created the guide: "Wired without limits". In addition, the Victron Toolkit App has a cross-section for calculating the required cable cross-section.

Cable recommendations to be used for a distance of 2m between inverter and battery:

• For this 25,6V 200Ah lithium battery: minimum 25mm section.

Fuse the fuses

Serial connection:

• Two 25.6V batteries can be connected in series, for a total of 51.2V.
• Batteries must be charged and balanced individually before connection.
• To connect batteries in series, the negative is connected to the positive of the next battery.
• The fuse is placed in the positive part of the chain.

Parallel connection:

• Up to 50 NG lithium batteries can be connected per NG BMS.
• The fuses must be placed on the positive side of each lithium battery.
• The cables of the DC system are connected diagonally.
• The cable cross-section of the system shall be equal to the cable cross-section of the chain multiplied by the number of chains.
  • There are as many strings as the number of batteries in parallel.
• The fuse is placed in the main positive cable of the LiFePO4 battery bank.

Serial/parallel combination connection:

• A system of up to 50 NG lithium batteries can be mounted per NG BMS.
• Before connection, each battery must be fully charged and individually balanced.
• The fuses are placed on the positive side of each battery string.
• Do not interconnect the midpoints with each other or connect anything else to them.
• The system cables are connected diagonally.
• The cable cross-section of the system shall be equal to the cable cross-section of the chain multiplied by the number of chains.
• The fuse is placed in the main positive cable leading to the battery bank.

Charger settings 

• • Absorption voltage: 28.4 V.
  • Floating voltage: 27 V.
  • Absorption time: 2 hours.
  • For more information, see the section "First charge of the lithium battery".

The manual (link at the end of the sheet) has a checklist to check that all connections and wiring of the system have been done correctly.

An example of an NG 25,6V 200Ah battery installation

This picture shows an example of a typical system installation of an NG battery and an NG BMS:

This installation consists of:

• One charger and one charge.
• Solar panels.
• Smart Solar MPPT charge controller.
• Inverter Multiplus II.
• Cerbo Gx monitoring.
• VictronConnect App.
• Victron NG lithium battery.
• Lynx Smart BMS NG 500 A.
• Lynx Class-T power in (M10).
• Lynx Distributor (M10).

List of materials needed to install the NG 25,6V 200Ah battery

• The installation of a BMS NG is mandatory:
  • Lynx Smart BMS 500 NG (M10) Victron - LYN034160310
  • Lynx Smart BMS 1000 NG (M10) Victron - LYN034170310
  • The BMS cables for LiFePO4 batteries are 50cm long, you can buy 1m, 3m or 5m extension cables: Victron cable with 3-pole male/female M8 circular connector 3m - ASS030560300
• With the Bluetooth connection of the BMS NG, the system can be monitored via the VictronConnect App. It can also be done with the Victron VRM portal if a GX device is installed: Victron Cerbo GX Monitoring - BPP900450100.
  • If a screen is installed, Monitoring Victron GX Touch 50 - BPP900455050, you can see all the information in real time without having to connect to anything.
• With a GX device installed, the system can be monitored remotely via the VRM portal. Monitoring via the VictronConnect App is subject to the Bluetooth range of the BMS NG and there is also the limitation that the app does not run in the background.

Victron NG LiFePO4 battery first charge

Lithium batteries may have different states of charge at the time of installation. Variations from the 50% state of charge at the factory may occur during transport and storage.

To connect batteries in series, they must first be charged separately with a charger or a dedicated inverter/charger with a BMS, as there can be large differences in the state of charge. These differences are not the same as imbalances between the cell voltages of a battery. This is because the cell balancing circuits of one battery cannot affect the cells of another battery.

If they are connected in parallel they can be charged as a unit, so it is not necessary to charge them before connecting them.

Loading process:

• First you have to configure the charging profile in the charger with the recommended settings:
  • It must be a 24V charger and must have a profile for charging lithium batteries or allow a custom profile to be made.
  • Absorption voltage: 28,4 V.
  • Absorption time:
    • Between 4 and 8 hours per month for systems with high usage (stand-alone or ESS type).
    • Minimum 2 hours per month for systems with little operation, such as auxiliary applications or UPS.
  • Floating tension: 27 V.
  • Values that not all chargers have:
    • Storage mode: same value as the buoyancy stress.
    • Initial charging voltage: same value as the absorption voltage.
  • Lithium batteries do not require temperature compensated charging. Set the value of this parameter to: 0mV/°C.
  • A charging current of 0.5C is recommended. For the 200Ah LiFePO4 NG battery, the charging current would be 100A.
• The battery, the BMS NG and the charger must communicate with each other. To check this, disconnect one of the cables leading from the battery to the BMS NG and see if the charger switches off. When the cable is reconnected, the charger should turn on.
• Turn on the charger and check that the battery is charging.
  • If, during the charging process, there is any imbalance between the battery cells, it is possible that the BMS NG will repeatedly switch the charger off and on. This will be repeated until
    that the cells are balanced and the charger will not switch off until the battery is fully charged.
• The battery is fully charged when the battery charger has reached the float state and the cells are in the "balanced" state. If the state of the cells is "unknown" or "unbalanced", the battery charger will restart several times until it is "balanced".

Battery management system (BMS NG)

The firmware of the NG lithium battery is automatically updated via the NG BMS. The NG BMS update can be done via the VRM Portal or the VictronConnect App. The App must be up to date otherwise it will not have the latest firmware version.

Functions performed by the BMS NG:

The BMS NG controls loads and chargers in two ways:

• Sending an electrical or digital on/off signal to the charger or load.
• By physically connecting or disconnecting a load or charging source from the battery. Directly or by using a BatteryProtect or a Cyrix Li-ion relay.

The Lynx Smart BMS NG is used in systems containing DC loads and AC loads via inverters or inverter/chargers. This BMS NG is equipped with a contactor that disconnects the DC system, a "load process disconnect", a "load disconnect", a "pre-alarm" contact and a battery monitor. It can also be connected to a GX device and Victron Energy compatible control equipment via DVCC.

• In case of low cell voltage, the BMS NG will send a "load disconnect" signal to switch off the load(s).
• In case of high cell voltage or low or high battery temperature, the BMS NG will send a "load disconnect" signal to switch off the charger(s).
• Before shutting down a load, it will send a pre-alarm signal indicating impending low cell voltage.
• If the batteries are further discharged (or overcharged), the contactor will open, effectively disconnecting the DC system to protect the batteries.

Operating conditions

• Charging must be done in a temperature range of +5°C to +50 °C:
  • If the temperature is less than or equal to 15 °C: the charging current must be reduced to a maximum of 0.3C.
  • If the temperature is higher than 35 °C: the load current must also be reduced.
• The discharge must be made from -20 °C to +50 °C:
  • If the temperature is 0°C or below: the discharge current must be reduced to 0.5C.
  • If the temperature is higher than 35 °C: the discharge current must also be reduced.

Victron NG LiFePO4 Battery Maintenance

• When the BMS NG pre-alarm is activated, the system must be prevented from shutting down.
• Total discharge should be avoided.
• If the BMS NG deactivates the loads, the batteries must be recharged immediately. The batteries should not be left in a deeply discharged state for a long time.
• Do not interrupt the charging process until the status is "balanced" for all lithium batteries in the system.
• If the system is not to be used for a period of time, the batteries must be left charged and the DC system must be disconnected.

NG battery storage

• Direct sunlight, high humidity and high temperatures should be avoided.
• Store in a cool and ventilated place (temperature +25 ±5°C).
• Leave an adequate distance between the walls and the coil to ensure proper ventilation.
• Store lithium batteries in plastic or non-conductive trays.
• In case of long-term storage:
  • Never store with the terminals facing downwards.
  • Charge the battery at 40-60 % initially and check the open circuit voltage monthly.
  • Charge immediately if the voltage drops below 3.0 V/cell.
  • The battery should be charged every six months.

Victron LiFePO4 Lithium Battery 25,6V 200Ah NG - BAT524120620 manual and datasheet

In case you need more information, here you have the manual and the technical data sheet of this LiFePO4 NG lithium battery:

Manual lithium battery LiFePO4 Victron 25,6V 200Ah NG - BAT524120620

Datasheet lithium battery LiFePO4 Victron 25,6V 200Ah NG - BAT524120620