smallBMS NG 2.2. Features and functionality Bluetooth Smart The smallBMS NG has built-in Bluetooth Smart, enabling wireless configuration, monitoring, and firmware updates via Apple and Android smartphones, tablets, or other compatible devices. Various parameters can be adjusted using the VictronConnect App . This also includes Instant Readout, allowing key BMS and battery data - SoC, battery temperature, warnings, and alarms - to be displayed on the VictronConnect device list without needing to connect to the product. Load Disconnect output Controls the remote on/off input of a BatteryProtect , Inverters , DC-DC converter , or other loads with remote on/off functionality.
The output is normally high, becomes free-floating when cell undervoltage is imminent. Maximum output current: 1A (not short-circuit protected). Note that a non-inverting or inverting on/off cable may be required (see Appendix A [23] ). 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 . Note that the Charge disconnect output is not suitable to power an inductive load such as a relay coil. The output is normally high, becomes free-floating in case of imminent cell overvoltage or overtemperature. Maximum output current: 500mA (not short-circuit protected).
Remote on/off terminal Allows remote control of the Load and Charge Disconnect outputs. When off, both outputs become free-floating, turning off connected loads and chargers. Consists of two terminals: Remote L and Remote H. Can be operated using: A switch or relay contact between L and H. H switched to battery plus or L switched to battery minus. An on/off switch or the default wire loop must be installed for correct operation. Pre-alarm output Triggers a visible or audible warning when battery voltage is low, activating at least 30 seconds before the Load Disconnect output is disabled due to cell undervoltage. Can drive a relay, LED, or buzzer. Maximum output current:
1A (not short-circuit protected). The output is normally free-floating, becomes high in case of imminent cell undervoltage. The pre-alarm level can be adjusted via VictronConnect. Configurable discharge floor Defines the minimum SoC to prevent excessive discharge and ensure enough energy remains for self-discharge after a low SoC shutdown. A low SoC warning level can be set, triggering a warning in VictronConnect that the discharge floor is about to be reached. The pre-alarm output is activated as soon as the warning level is reached. The value should be set high enough to leave enough time to recharge the battery to prevent a low SoC shutdown.
A low SoC alarm is triggered when the discharge floor is reached, and the BMS immediately deactivates the ATD output, effectively shutting off any loads it controls. LED indicators Blue Bluetooth Status LED: Blinks when no connection to VictronConnect. Lit solid when connected. Red Error LED: Solid when an error occurs (details available in VictronConnect). Blinks in case of a warning (details available in VictronConnect). Page 3 Introduction