SmallBMS NG

The SmallBMS NG is a comprehensive Battery Management System (BMS) specifically engineered for Victron Lithium NG batteries, and it is not compatible with lithium smart batteries. This system effectively monitors and safeguards the batteries by controlling charge and load disconnections, as well as issuing pre-alarms for low battery voltage.

As a simple and economical option compared to the VE.Bus BMS NG, the SmallBMS NG is ideal for applications that do not necessitate integration with Victron inverter/chargers. It offers fundamental protection for lithium batteries without the complexities associated with VE.Bus communication, making it unsuitable for use with VE.Bus inverter/chargers like the MultiPlus and Quattro.

Equipped with built-in Bluetooth, the SmallBMS NG establishes a direct connection to all lithium NG batteries within the system, enabling centralized monitoring through VictronConnect. It also obtains current and state of charge information directly from the batteries, eliminating the need for a separate SmartShunt.

The lithium NG batteries can be configured in series, parallel, or a combination of both, supporting 12V, 24V, and 48V systems. A maximum of 50 batteries can be used in 12V or 24V banks, and 25 batteries in 48V banks, enabling up to 192 kWh (12V), 384 kWh (24V), and 128 kWh (48V) of storage. Multiple Lynx Smart BMS units can be paralleled to expand capacity and ensure redundancy.

• Load disconnect output: Can be used to control the remote on/off input of a BatteryProtect, Inverters, DC-DC converter or other loads that have remote on/off port functionality. Due to its maximum output current of 1A, it can even control a high-current relay or a contactor. Note that a non inverting or inverting on/off cable may be required, please consult the manual.
• Pre-alarm output: The pre-alarm output can be used to issue a visible or audible warning when the battery voltage is low and will trip with a minimum delay of 30 seconds before the Load disconnect output is disabled due to cell undervoltage.
• Charge disconnect output: Can be used to control the remote on/off port of a charger, such as the Phoenix Smart Charger IP43, a Cyrix-Li-Charge relay, a Cyrix-Li-ct Battery Combiner or a BatteryProtect. The output is normally high and becomes free floating in case of imminent low cell voltage or high/low temperature. Note that the Charge disconnect output is not suitable to power an inductive load such as a relay coil.
• Remote on/off terminal: Both the Load and Charge disconnect output can be controlled remotely via the remote on/off terminal. When off, both outputs will be free floating so that loads and chargers are turned off.
• LED indicators: The smallBMS has two LED indicators, a blue LED indicating that the Load disconnect output is still high and the cell voltage is above the threshold set in the battery, and a red LED indicating that the Charge disconnect output is low due to high/low cell temperature or high cell voltage.