BMS NG

The VE.Bus BMS NG is a battery management system (BMS) designed specifically for lithium iron phosphate (LiFePO4) batteries in the Victron Energy Lithium NG range. Its primary role is to protect and control these batteries within systems that include a Victron VE.Bus inverter/charger or inverter.

The VE.Bus BMS NG is compatible exclusively with Victron Energy Lithium NG batteries. It is not designed to be used with Victron Lithium Smart batteries (without the NG designation).

The BMS NG provides several essential protection functions:

It generates a pre-alarm in case of imminent cell undervoltage. It disables the inverter function of VE.Bus chargers/converters and disconnects loads via its dedicated output in case of cell undervoltage. It disables charging of VE.Bus chargers/converters, VE.Direct and VE.Can solar chargers (via a GX device), and disconnects other chargers in case of cell overvoltage, low temperature, or overheating.

The VE.Bus BMS NG uses several communication interfaces:

VE.Bus: Two RJ45 ports allow connection to VE.Bus products such as MultiPlus, Quattro, or inverters.
Bluetooth Smart: For configuration, monitoring, and firmware updates via the VictronConnect app on smartphone or tablet.
Remote panel port: For connecting GX devices (such as a Cerbo GX), Digital Multi Control (DMC) panels, or VE.Bus Smart dongles.

The VE.Bus BMS NG can be used to create battery banks suited to system voltages of 12V, 24V or 48V, by combining Lithium NG batteries of 12.8V, 25.6V and 51.2V in series, in parallel or a combination of both.

The VE.Bus BMS NG allows connecting:

Up to 50 batteries for 12V or 24V system configurations. Up to 25 batteries for 48V system configurations. This allows maximum storage capacities of 192 kWh for 12V systems, 384 kWh for 24V systems, and 128 kWh for 48V systems.

Yes, the VE.Bus BMS NG includes Bluetooth Smart. This feature enables wireless configuration, monitoring, and software updates via the VictronConnect app. It also provides instant reading of key data such as state of charge (SoC), battery temperature, warnings, and alarms directly in the device list.

The DC power cable for the BMS is not included. A single-core cable of at least 0.75 mm² (AWG 16) with an inline 1A fuse must be used.

The installation of the VE.Bus BMS NG must be carried out exclusively by qualified and trained installers, strictly complying with national safety regulations.

The VE.Bus BMS NG pre-alarm output is designed to trigger a visible or audible warning when the battery voltage is low. It activates at least 30 seconds before the load disconnect output is disabled due to cell undervoltage. It can drive a relay, LED, or buzzer, with a maximum output current of 1A.

The VE.Bus BMS NG has two main control outputs:

Load Disconnect output: Controls the remote on/off input of a BatteryProtect, inverters, DC-DC converters or other loads with this feature. It is normally high and goes floating in case of imminent cell undervoltage.Charge Disconnect output: Controls the remote on/off input of chargers such as the Smart Charger IP43, a Cyrix-Li-Charge relay, a Cyrix-Li-ct or a BatteryProtect. It is normally high and goes floating in case of cell overvoltage or imminent overheating.

The remote on/off terminal (Remote L and Remote H) allows remote control of the load disconnect and charger outputs. When this terminal is disabled, both outputs become floating, thus powering off the connected loads and chargers. It can be activated by a switch or relay contact between L and H, or by connecting H to the battery positive or L to the battery negative.

Yes, the VE.Bus BMS NG can disable charging of VE.Direct and VE.Can solar chargers via a GX device in case of cell overvoltage, low temperature, or overheating.

The VE.Bus BMS NG is equipped with three LED indicators:

A blue LED for Bluetooth status. A red LED for warnings and alarm errors. A VE.Bus status LED.

The VE.Bus BMS NG operates with an input voltage range of 9 to 70 VDC.

The current consumption of the VE.Bus BMS NG varies depending on its state:

In normal operation: 10 mA (excluding load disconnection current).In case of low cell voltage: 2 mA.When powered off via the remote on/off terminal: 1.50 mA.

The VE.Bus BMS NG features a dedicated power output (GX-Power) capable of supplying up to 1A to a GX device. This output powers the GX device from the battery or the auxiliary input (Aux-In), depending on the highest available voltage.

The VE.Bus BMS NG has the following dimensions: 23.2 mm (height) x 95.0 mm (width) x 105.8 mm (depth). Its weight is 120 grams.

The VE.Bus BMS NG has an IP20 protection rating, meaning it is protected against solid objects larger than 12.5 mm but offers no water protection.

The VE.Bus BMS NG is specifically designed to be compatible with Victron Energy Lithium NG batteries. It must not be confused with Lithium Smart batteries (without the NG designation), with which it is not compatible.

These Lithium NG batteries are based on Lithium Iron Phosphate (LiFePO₄) technology and are available in different voltages:

12.8 V25.6 V51.2 VThey can be connected in series, in parallel, or a combination of both, to create battery banks suitable for 12 V, 24 V, or 48 V systems. The BMS NG monitors and protects each individual cell in these batteries.