smallBMS NG

The smallBMS NG is an all-in-one battery management system (BMS) designed for Victron Lithium NG (LiFePO4) batteries at 12.8V, 25.6V, and 51.2V. It enables the creation of battery banks for 12V, 24V, or 48V system voltages while ensuring their protection and management.

The smallBMS NG is exclusively compatible with Victron Lithium NG batteries. These are Lithium Iron Phosphate (LiFePO4) batteries available in 12.8V, 25.6V and 51.2V.

The smallBMS NG is a simple and cost-effective alternative to the VE.Bus BMS NG. The main difference is that the smallBMS NG does not have a VE.Bus interface, making it unsuitable for use with MultiPlus and Quattro inverters/chargers equipped with a VE.Bus interface.

The smallBMS NG allows connecting a maximum of 50 batteries for 12V or 24V bank configurations. For 48V systems, up to 25 batteries can be used.

The smallBMS NG supports a maximum storage capacity of:

192 kWh with 12V batteries. 384 kWh with 24V batteries. 128 kWh with 48V batteries.

Yes, Victron Lithium NG batteries can be connected in series, parallel, or a combination of both. This allows creating battery banks for system voltages of 12V, 24V, or 48V with the smallBMS NG.

The smallBMS NG integrates Bluetooth Smart technology, enabling wireless configuration, monitoring, and firmware updates. This is done via the VictronConnect app, available for Apple and Android smartphones and tablets.

The 'Instant Readout' function displays key battery and BMS data, such as state of charge (SoC), battery temperature, warnings, and alarms. This information appears directly in the VictronConnect device list without requiring a connection to the product.

The Load Disconnect output controls the remote on/off input of a BatteryProtect, inverters, DC-DC converters or other loads with a remote on/off function. It disconnects these loads in case of imminent cell undervoltage.

The 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. It interrupts charging in case of imminent cell overvoltage or temperature issues.

The pre-alarm output triggers a visible or audible warning when 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.

The remote on/off terminal enables external control of load disconnect and consumption outputs. When disabled, both outputs become floating, turning off connected loads and chargers. It consists of two terminals (Remote L and Remote H) and can be actuated by a switch, relay contact, or by pulling the terminals to ground or battery positive.

The smallBMS NG has a configurable discharge threshold (discharge floor) that defines the minimum SoC. This prevents excessive discharge and ensures sufficient energy remains for self-discharge after a low SoC shutdown. A low SoC warning is triggered, activating the pre-alarm output, before a low SoC alarm cuts loads via the ATD output.

It is crucial to follow national safety regulations. Installation must be performed by qualified installers. Do not discharge a new lithium battery before it has been fully charged, and charge it only within the specified limits. The battery must be installed in a ventilated area and must not be mounted upside down or in a living space. It is also important to ensure there is no residual current draw when the system is not in use to avoid damaging the battery.

The operating voltage range of the smallBMS NG is 8 to 70 Vdc.

The current consumption of the smallBMS NG in 'remote on' mode is 3 mA (excluding load disconnection output current and consumption). The current consumption in case of low cell voltage is 1.2 mA. The current consumption in 'remote off' mode is 1.2 mA.

The smallBMS NG has the following dimensions (height x width x depth): 106 x 42 x 23 mm. Its weight is 0.1 kg.

The smallBMS NG can operate within a temperature range from -20 to +50 °C (0 to 120 °F).

The smallBMS NG has an IP20 rating.

The smallBMS NG is specifically designed for Victron Lithium NG (LiFePO4) batteries of 12.8V, 25.6V, and 51.2V. It can control loads and chargers with a remote on/off input, such as BatteryProtect, DC-DC converters, certain inverters, Smart Charger IP43, as well as Cyrix-Li-Charge and Cyrix-Li-ct relays.

However, the smallBMS NG does not have a VE.Bus interface. It is therefore not suitable for use with Victron Energy VE.Bus MultiPlus and Quattro inverters/chargers.