BMS Victron Energy smallBMS NG, Bluetooth, IP20

smallBMS NG - Compact management system for Lithium NG batteries

The smallBMS NG is a battery management system for Victron Lithium NG batteries, a simple alternative to the VE.Bus BMS NG for installations without VE.Bus inverter/chargers such as MultiPlus or Quattro. It controls charge and load disconnection, issues a pre-alarm at low voltage and is monitored via Bluetooth in VictronConnect.

Main features:

• Compatible batteries: Lithium NG, not Lithium Battery Smart
• Bank configurations: 12, 24 or 48 V, in series and/or in parallel
• Control outputs: loads 1 A, charge 500 mA, pre-alarm 500 mA
• Pre-alarm: warns of low voltage at least 30 s in advance
• Connectivity: Bluetooth, VictronConnect with Instant Readout
• Self-consumption: 3 mA on, 1.2 mA off

The smallBMS NG is a complete battery management system (BMS) designed for Victron Lithium NG batteries (not compatible with Lithium Battery Smart batteries). It monitors and protects the batteries by managing charge and load disconnection and by activating a pre-alarm in case of low battery voltage.

The smallBMS NG is a simple and cost-effective alternative to the VE.Bus BMS NG for applications that do not require integration with Victron inverter/chargers. It provides essential protection for lithium batteries without the added complexity of VE.Bus communication and is therefore not suitable for use with VE.Bus inverter/chargers such as MultiPlus and Quattro.

Thanks to the built-in Bluetooth, it connects directly to all Lithium NG batteries in the system for centralised monitoring via VictronConnect. It also receives current and state-of-charge data directly from the batteries, so a separate SmartShunt is not needed.

Lithium NG batteries can be configured in series, in parallel or in a combination of the two, supporting 12 V, 24 V and 48 V systems. A 12 V or 24 V battery bank can contain a maximum of 50 batteries, and a 48 V battery bank a maximum of 25 batteries, giving a storage capacity of up to 192 kWh (12 V), 384 kWh (24 V) and 128 kWh (48 V). Several Lynx Smart BMS units can be connected in parallel to extend capacity and provide redundancy.

Main features:

• Load disconnect output: controls the remote on/off input of a BatteryProtect, inverter, DC-DC converter or other loads with a remote on/off function to prevent deep discharge.
• Charge disconnect output: controls the remote on/off port of chargers, such as the Smart IP43 charger, a Cyrix-Li-Charge relay, a Cyrix-Li-ct battery combiner or a BatteryProtect, to prevent overvoltage.
• Pre-alarm output: provides an early warning in case of low battery voltage before the loads are disconnected. It can drive a relay, an LED or a buzzer.
• Remote on/off control: allows external control of the load disconnect and charge disconnect outputs.
• LED indicators: includes a blue LED for the Bluetooth status and a red LED for warnings and errors.

Technical specifications