Victron smallBMS with Pre-Alarm - BMS400100000

Victron Energy smallBMS with Pre-Alarm – Compact BMS for LiFePO₄ Smart Batteries (BMS400100000)

The Victron smallBMS with Pre-Alarm is a simplified battery management system for Victron Lithium Battery Smart batteries. It ensures safe and efficient operation by disconnecting loads and chargers under unsafe voltage or temperature conditions. Designed without a VE.Bus interface, it’s ideal for smaller or cost-sensitive systems not using Victron inverter/chargers like MultiPlus or Quattro. Featuring pre-alarm functionality, remote on/off control, and compatibility with BatteryProtect, DC-DC converters, and Smart Chargers, it delivers flexible and reliable battery protection.

Key Features

• Supports up to 20 Smart LiFePO₄ batteries in series/parallel configurations
• Compatible with 12V, 24V, and 48V systems (up to 102 kWh total)
• Pre-alarm output for early warning before disconnection
• Load Disconnect output (1 A max) for turning off loads or inverters
• Charge Disconnect output (10 mA max) for disabling chargers
• Remote On/Off terminals for manual or automated control
• Simple integration with Smart BatteryProtect, Cyrix relays, Smart DC systems

Electrical Specifications

Remote Control Logic

• ON when terminals L and H are interconnected (switch or relay)
• ON when L is pulled to battery minus (V < 3.5 V)
• ON when H is high (2.9 V < VH < Vbat)
• OFF in all other conditions

Mechanical and Environmental

Standards and Certifications

• Safety: EN 60950
• Emission: EN 61000-6-3, EN 55014-1
• Immunity: EN 61000-6-2, EN 61000-6-1, EN 55014-2
• Automotive: UN/ECE-R10 Rev.4

Application Scenarios

The smallBMS is ideal for systems where cost, size, and simplicity are priorities. It is often used in mobile, marine, and remote power setups where full VE.Bus integration is not required. It pairs well with SmartSolar chargers, SmartShunt, and the Cyrix relay family to form a complete protected lithium system without the complexity of larger BMS models.