Victron Energy SmallBMS NG

The smallBMS NG with pre-alarm is an all-in-one Battery Management System (BMS) for Victron Lithium NG batteries (not to be confused with the lithium smart batteries without NG). These batteries are Lithium Iron Phosphate (LiFePO 4 ) batteries and are available in 12.8V, 25.6V and 51.2V in various capacities. They can be connected in series, parallel, or a combination of both to create battery banks for system voltages of 12V, 24V, or 48V. A maximum of 50 batteries can be used when configuring a bank with 12V or 24V batteries, while up to 25 batteries can be used with 48V batteries. This allows a maximum energy storage capacity of 192 kWh with 12V batteries, up to 284 kWh with 24V batteries, and 128 kWh with 48V batteries.

The smallBMS NG is a simple and inexpensive alternative to the VE.Bus BMS, but does not have a VE.Bus interface and is therefore not suitable for use with VE.Bus MultiPlus and Quattro inverter/chargers.

Features

• Load disconnect output: Controls the remote on/off input of a BatteryProtect, Inverters, DC-DC converter, or other loads with remote on/off functionality. Due to its maximum output current of 1A, it can even control a high-current relay or contactor. Note that a non-inverting or inverting on/off cable may be required, please consult the manual.
• 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.
• 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).
• 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.
• LED indicators: The smallBMS NG has two LEDs: a blue LED for Bluetooth status and a red LED for warning and alarm errors.
• Configurable discharge floor: Sets the minimum SoC to prevent excessive discharge while ensuring enough energy for self-discharge. A low SoC warning is trigged in VictronConnect, activating the pre-alarm output when the discharge floor is near. If the discharge floor is reached, a low SoC alarm is issued, and the BMS switches off loads after 5 minutes if no charge voltage is detected.

Part Number/s: BMS400100300