Victron Energy VE.Bus BMS Battery Management System, For Victron LiFePO4 Batteries, 12-48VDC

Overview

The Victron Energy BMS300200000 is a VE.Bus battery management system for Victron LiFePO4 and LFP battery banks on 12V, 24V and 48V DC marine power systems. It operates across a 9 to 70V DC input range and protects individual lithium cells against over-voltage, under-voltage and over-temperature conditions.

This unit is used with Victron lithium batteries that have integrated Balancing, Temperature and Voltage control, often referred to as BTV. The BTV connections from multiple batteries can be daisy-chained, allowing the BMS to supervise the battery bank and send control signals when the bank needs loads reduced, charging limited or chargers disconnected.

For boats using VE.Bus equipment, the BMS links to MultiPlus, Quattro or Phoenix inverter products through a standard RJ45 UTP cable. It also gives installers Load Disconnect, Charge Disconnect and Pre-alarm outputs for controlling supporting equipment in a safer lithium setup.

Key features

• Protects each individual cell in a Victron LiFePO4 or LFP battery against over-voltage, under-voltage and over-temperature conditions.
• Works in 12V, 24V and 48V DC systems, with a BMS input voltage range of 9 to 70V DC.
• Connects to MultiPlus, Quattro or Phoenix inverter products through a standard RJ45 UTP VE.Bus cable.
• Uses Load Disconnect, Charge Disconnect and Pre-alarm outputs to manage loads, chargers and warning devices during battery fault conditions.
• Supports daisy-chained BTV battery connections for multi-battery Victron LiFePO4 banks.
• Load Disconnect output has a 2A source current limit, while the Charge Disconnect output has a 10mA source current limit.
• Pre-alarm output can trigger a warning before load disconnect, with a minimum 30 second delay between pre-alarm and load disconnect.
• IP20 housing for installation inside a protected electrical area, with an operating temperature range from -20°C to +50°C.
• ABS enclosure measures 105 x 78 x 32 mm and weighs about 0.1 kg.

Compatibility and fit

The VE.Bus BMS is for Victron LiFePO4 battery systems that use BTV connections. It is not a generic drop-in BMS for unrelated lithium batteries, so the battery type and Victron BTV cabling should be confirmed before installation.

The battery BTV leads can be daisy-chained across several batteries. The system supports arrangements with up to five batteries in parallel and up to four batteries in series, which covers typical 12V, 24V and 48V house-bank layouts when the battery bank is configured within the proper lithium system limits.

VE.Bus communication is handled through two RJ45 sockets, making the unit a natural fit for boats with Victron inverter or inverter/charger equipment already in the electrical system. Non-VE.Bus loads and charge sources can be controlled through the appropriate disconnect terminals rather than through VE.Bus communication.

Installation and setup

Mount this BMS in a dry and protected electrical space, such as an electronics locker, battery control area or distribution panel compartment. The IP20 protection grade and 95% maximum non-condensing humidity rating mean it should not be installed where it can be exposed to deck wash, bilge splash or dripping water.

The Load Disconnect output is normally high and becomes free-floating when cell under-voltage is imminent. The Charge Disconnect output is normally high and becomes free-floating when cell over-voltage or over-temperature is detected. The Pre-alarm output is normally free-floating and becomes high during an imminent cell under-voltage alarm, allowing a light, buzzer or relay to warn the crew before loads are disconnected.

Keep the BTV, RJ45 UTP and disconnect wiring accessible and well supported. On a boat, clean routing and strain relief matter because battery spaces and electrical lockers see movement, service work and seasonal maintenance.

Use cases on board

This BMS is a practical match for cruising boats, fishing boats and sailboats using Victron lithium batteries with a VE.Bus inverter or inverter/charger. It helps coordinate the lithium bank with onboard DC loads, AC inverter loads and charge sources so the system reacts before the cells move outside their safe operating range.

The unit does not carry the main battery current itself. It belongs in a properly planned lithium installation with suitable fusing, cabling, load control and charger control hardware, so the BMS commands the system while the power equipment handles the actual current.