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 system voltages of 12V, 24V, or 48V, 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 economical 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 up to 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, in parallel, or in a combination of both. This allows for battery banks with system voltages of 12 V, 24 V, or 48 V using 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 allows you to view key BMS and battery data, such as state of charge (SoC), battery temperature, warnings, and alarms. This information is displayed directly in the VictronConnect app's device list without needing to connect 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 consumption disconnect output remotely controls the on/off state 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, an LED, or a buzzer.

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

The smallBMS NG features a configurable discharge floor threshold that sets 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 comply with national safety regulations. Installation must be carried out 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 prevent battery damage.

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

The smallBMS NG current consumption in "remote on" mode is 3 mA (excluding load disconnection output current and consumption). The current consumption at 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 of -20 to +50 °C (0 to 120 °F).

The smallBMS NG has an IP20 protection 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 units, DC-DC converters, certain inverters, Smart Charger IP43 units, as well as Cyrix-Li-Charge and Cyrix-Li-ct relays.

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