Victron battery management system VE.Bus BMS

Battery Management System VE.Bus BMS by Victron

Protects every single cell of a lithium iron phosphate (LiFePO4 or LFP) battery
Every single cell of a LiFePO4 battery must be protected against overvoltage, undervoltage and overtemperature.
Victron LiFePO4 batteries feature built-in cell balancing, temperature and voltage control (in English: Balancing, Temperature and Voltage control, hence the acronym: BTV). They are connected to the VE.Bus BMS via two M8 round connector cable sets.
The BTVs of multiple batteries can be daisy-chained together. Up to ten batteries can be connected in parallel and up to four batteries in series (BTVs are simply daisy-chained), allowing for the assembly of a 48 V battery bank with up to 3000 Ah. For further details on this, please refer to the technical documentation for Victron LiFePO4 batteries.

Tasks of the BMS:

• Switching off or disconnecting loads in the event of imminent undervoltage
• Reducing the charging current in the event of imminent cell overvoltage or overtemperature (only for VE.Bus products)
• Switching off or disconnecting the battery chargers in the event of imminent cell overvoltage or overtemperature.

Overview of a battery system
You can individually configure your battery system.
Three components are used to control the energy flows:

• VE.Bus BMS
  is the central control unit. The data cables of the batteries are connected, so that the BMS can pass on the read information for the appropriate switching commands. Furthermore, there are numerous other communication connections with which, for example, MultiPlus inverters or high-load relays can be controlled.
• Cyrix Li Load
  This device is connected between the load (=Load) and the power supply (the batteries). If the battery is running low (undervoltage alarm), the consumers are disconnected from the battery.
• Cyrix Li Charge
  The Charge Li device is located between the batteries and the chargers (=Charge) such as the solar system or, for example, the alternator. If the energy source provides too much power (overvoltage message), the charger is disconnected.

Technical data