Victron LiFePO4 Lithium Battery 25,6V 100Ah NG - BAT524110620

Victron LiFePO4 Lithium Battery 25,6V 100Ah NG - BAT524110620

The Victron LiFePO4 25,6V 100Ah 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. A maximum of 50 batteries can be connected per BMS NG; the maximum energy storage of this system consisting of 100Ah batteries is 128kWh.

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

This LiFePO4 battery belongs to Victron's new NG (New Generation) series, which also consists of 12.8V and 51.2V batteries of different capacities.

Specifications of LiFePO4 25,6V 100Ah NG Battery

• Rated voltage: 25,6 V
• Rated capacity at 25 °C: 100 Ah
• Rated energy at 25 °C: 2560 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 temperature.
• Dimensions: 235 x 341 x 160 mm
• Weight: 19 Kg

Carrying capacity

• Charging voltage: 28.00V - 28.8V
• Floating tension: 27 V
• Maximum continuous load current: 100 A (1C)
• Maximum load current per 10s intervals: 200 A (2C)

Lithium battery discharge capacity 25,6V 100Ah NG

• Maximum continuous discharge current: 100A (1C)
• Maximum discharge current per 10s intervals: 200 A (2C)
• Voltage at the end of the discharge: 22.4 V (Minimum battery voltage).
• Internal resistance: 4 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 to be taken into account

• Separate measurements of each cell: Individual cell voltages and temperatures in addition to battery current.
• Specific BMS for the NG battery series: A BMS compatible with the new NG series, such as the Lynx Smart BMS NG 500 A or Lynx Smart BMS NG 1000 A, must be used. These NG BMSs must be purchased separately from the battery.
• 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 series BMS.
• Battery firmware updates: The firmware is automatically updated by the BMS NG.
• Maximum number of batteries per BMS NG: 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 100Ah

This image shows the dimensions of the Victron NG 25,6V 100Ah NG battery:

Victron LiFePO4 25.6V 100Ah NG battery assembly:

• It can be mounted vertically or on its side, but must never be mounted with the terminals facing downwards.
  • It offers two optionsis for fixation: straps or mounting brackets.
  • Mounting brackets secure the battery so that it cannot slide or tip over.
• Install indoors and in a dry place.
• The NG lithium battery weighs 19Kg, it is recommended to use handling equipment to transport it safely.
• A space of 2 cm should be left around the battery (on all four sides) to allow for ventilation (the battery heats up when discharging and charging).
• The polarity must be observed when connecting the terminals. The screws are tightened with a torque of 10 Nm, using a tool suitable for the size of the screw head. The picture below shows the order in which the wires are to be connected:

• BMS NG must be installed: Lynx Smart BMS NG 500 A or Lynx Smart BMS NG 1000 A (to be purchased separately).
  • This BMS manages all battery parameters. It detects the system voltage and the number of batteries connected in parallel, in series and in series/parallel combination.
• To monitor the installation you need the VictronConnect App, which connects to the Bluetooth of the BMS NG. And if you want to do it remotely, you also need a GX device and the Victron VRM portal.

Connect NG BMS to NG lithium battery 25,6V 100Ah

• All NG batteries have two cables to communicate with the NG BMS. One has a male and one has a female connector, both with three poles. Depending on the NG battery, the BMS NG cables can be on the same side of the battery or on both sides.
  • The BMS NG battery cables are 50cm long, they can be extended with BMS NG extension cables (purchased separately).
  • With only one NG battery in the system, the cables are connected directly to the NG BMS.
  • In systems with 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 installation of LiFePO4 25,6V 100Ah NG battery

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

To learn more about sizing, Victron has created the guide: "Wired without limits". You can also install the App Victron Toolkit, 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 100A/h lithium battery: minimum 16mm section.

Insert the fuses

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 connection:

• Two 25.6 V batteries can be connected in series. This gives a total of 51.2 V.
• Batteries must be charged and balanced individually before connecting them in series.
• To connect one battery to another; the negative is connected to the positive of the next battery.
• The fuse is placed in the positive part of the chain.

Serial/parallel combination connection:

• Up to 50 NG lithium batteries can be connected 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".

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

Example of an NG 25,6V 100Ah battery installation

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

This installation consists of:

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

Materials needed to install the NG 25,6V 100Ah battery

• It is mandatory to put a BMS in the installation:
  • Lynx Smart BMS 500 NG (M10) Victron - LYN034160310
  • Lynx Smart BMS 1000 NG (M10) Victron - LYN034170310
  • The BMS cables that carry the batteries are 50cm long, extensions of 1m, 3m or 5m can be purchased: 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.
  • To see all the information in real time without the need to connect to anything, a display can be added to the installation: Monitoring Victron GX Touch 50 - BPP900455050.
• With a GX device installed, the system can be monitored from anywhere and at any time via the VRM portal. The VictronConnect App is limited to the Bluetooth range of the BMS NG and the app does not run in the background.

Victron NG LiFePO4 battery first charge

Lithium batteries may have different percentages of charge at the time of installation due to conditions during transport, storage, and because they come from the factory with a charge of approximately 50%.

To connect batteries in series, they must first be charged separately with a charger or a dedicated inverter/charger with a BMS; due to the 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. In the case of a 100Ah lithium battery, the charging current would be 50A.
• The battery, the BMS NG and the charger must communicate with each other. To check this, disconnect one of the cables from the battery to the BMS NG and see if the charger switches off. When you reconnect the cable, 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 updated to 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 (+25 ±5°C) and ventilated place.
• 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 upside down.
  • 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 100Ah NG - BAT524110620 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 100Ah NG - BAT524110620

Datasheet lithium battery LiFePO4 Victron 25,6V 100Ah NG - BAT524110620