Victron Energy smallBMS Battery Management System with Pre-Alarm – Remote Load Control

The Victron Energy smallBMS is a compact, versatile controller designed to work within larger battery systems. It combines a two-output interface with smart signaling to automate auxiliary devices without complex wiring. The result is a cleaner, more responsive energy setup that helps you manage power effectively.

Two outputs for flexible control

The smallBMS provides two outputs that let you automate remote on/off signals for components such as BatteryProtect, inverters, or DC-DC converters. This enables you to turn equipment on or off as needed, reducing idle load and extending system life.

• Remote on/off control for loads with dedicated ports
• Seamless integration with other Victron devices to coordinate actions

High-current capability and reliable signaling

Even with a maximum current of 1 A, the smallBMS can drive a high-current relay or contactor when your installation requires stronger switching. This makes it suitable for larger relays and more demanding setups while staying compact.

• Supports driving relays and contactors for robust control
• Reliable remote control across a range of equipment

Pre-alarm for voltage awareness

The pre-alarm output provides a delayed warning when battery voltage is getting low, helping you prepare connected devices and operators for the change. The signal trips with a minimum delay of 30 seconds, offering a practical buffer to avoid false alarms.

Versatile integration with chargers and protection devices

You can use the pre-alarm and control outputs to work with a charger such as the Phoenix Smart Charger IP43, as well as with Cyrix-Li-Charge relays, Cyrix-Li-ct Battery Combiners, or BatteryProtect modules. This broad compatibility supports cohesive energy management across brands and components.