The VE.Bus BMS NG is a Battery Management System (BMS) designed specifically for Victron Energy Lithium NG batteries (not to be confused with Lithium Smart batteries without NG designation). These are LiFePO₄ batteries available in 12,8 V, 25,6 V, and 51,2 V, and in various capacities.
The VE.Bus BMS NG is intended to interface with and protect Victron Lithium NG batteries in systems that include a Victron VE.Bus inverter/charger or VE.Bus inverter. It relies on this connection to perform key functions such as enabling/disabling charge and discharge based on battery conditions
Batteries can be connected in series, parallel, or a combination of both to build battery banks suitable for 12 V, 24 V, or 48 V system voltages.
For 12 V and 24 V configurations, up to 50 batteries can be used.
For 48 V configurations, the maximum is 25 batteries.
This results in a maximum storage capacity of:
192 kWh for 12 V systems
384 kWh for 24 V systems
128 kWh for 48 V systems
For complete specifications, refer to the Victron Lithium NG battery product page.
Cell-level protection
The BMS monitors and protects each individual cell of the connected battery or battery bank. Based on the status signals received from the battery, it will:
Trigger a pre-alarm to warn of an imminent cell undervoltage
Disconnect or shut down loads if a cell undervoltage condition occurs
Turn off the inverter in VE.Bus inverter/chargers or VE.Bus inverters in case of cell undervoltage
Reduce charge current if a cell overvoltage or overtemperature is detected in VE.Bus inverter/chargers or VE.Bus inverters
Disconnect or shut down chargers in case of cell overvoltage or overtemperature
Bluetooth Smart
The VE.Bus BMS NG has built-in Bluetooth Smart, enabling wireless configuration, monitoring, and firmware updates via Apple and Android smartphones, tablets, or other compatible devices. Various parameters can be adjusted using the VictronConnect App.
This also includes Instant Readout, allowing key BMS and battery data - SoC, battery temperature, warnings, and alarms - to be displayed on the VictronConnect device list without needing to connect to the product.
Load Disconnect output
Controls the remote on/off input of a BatteryProtect, Inverters, DC-DC converter, or other loads with remote on/off functionality.
The output is normally high, becomes free-floating when cell undervoltage is imminent. Maximum output current: 1A (not short-circuit protected).
Note that a non-inverting or inverting on/off cable may be required (see Appendix A).
Charge disconnect output
Controls the remote on/off port of chargers such as the Smart Charger IP43, a Cyrix-Li-Charge relay, a Cyrix-Li-ct Battery Combiner or a BatteryProtect. Note that the Charge disconnect output is not suitable to power an inductive load such as a relay coil.
The output is normally high, becomes free-floating in case of imminent cell overvoltage or overtemperature. Maximum output current: 500mA (not short-circuit protected).
Remote on/off terminal
Allows remote control of the Load and Charge Disconnect outputs. When off, both outputs become free-floating, turning off connected loads and chargers.
Consists of two terminals: Remote L and Remote H.
Can be operated using:
A switch or relay contact between L and H.
H switched to battery plus or L switched to battery minus.
Important
An on/off switch or the default wire loop must be installed for correct operation.
Pre-alarm output
Triggers a visible or audible warning when battery voltage is low, activating at least 30 seconds before the Load Disconnect output is disabled due to cell undervoltage.
Can drive a relay, LED, or buzzer. Maximum output current: 1A (not short-circuit protected).
The output is normally free-floating, becomes high in case of imminent cell undervoltage.
Configurable discharge floor
Defines the minimum SoC to prevent excessive discharge and ensure enough energy remains for self-discharge after a low SoC shutdown.
A low SoC warning level can be set, triggering a warning in VictronConnect that the discharge floor is about to be reached. The pre-alarm output is activated as soon as the warning level is reached. The value should be set high enough to leave enough time to recharge the battery to prevent a low SoC shutdown.
A low SoC alarm is triggered when the discharge floor is reached, and the BMS immediately deactivates the ATD output, effectively shutting off any loads it controls.
LED indicators
Blue Bluetooth Status LED:
Red Error LED:
VE.Bus Status LED:
Connectivity and communication with GX device
On/off/charger-only control of VE.Bus products via a GX device.
GX DVCC control of solar chargers. There is no need to install an BatteryProtect or Cyrix-Li-Charge to control solar chargers via the BMS like the VE.Bus BMS V1 does.
Has separate power input and output connections for GX devices
The GX-Pow output provides power to the GX device from either the battery or the Aux-In input, depending on which voltage is higher.
True remote on/off terminal
The VE.Bus BMS NG needs to remain connected to the battery positive in order to be able to keep the Multi in low power mode even when AC input on the Multi is available (Multi will stop inverting/charging, close the transfer switch and indicate a low battery error on the status LEDs).
Optional auxiliary power for remote access
For users who want to ensure continued remote access via VRM even when the system is otherwise shut down (e.g. due to a battery undervoltage or inverter/charger shutdown), an AC-DC adapter (not provided by Victron) or other power supply can be connected to the Aux-In input. This keeps the GX device powered as long as auxiliary power is available, allowing for remote diagnostics if internet connectivity is still present. See the Technical specifications VE.Bus BMS NG for the required power rating of an AC-DC adapter.
The following items are in the box:
1x VE.Bus BMS NG |  |
1x Mains detector | |
1x 0.3m RJ45 UTP cable | |
Piece of Velcro adhesive hook and loop tape |
Note that the DC power cable to power the BMS is not included. Use any 1-wire cable with at least 0.75mm2 (AWG 16) and a 1A inline fuse.