Victron VE Bus BMS - Battery Management Systems for Lithium Ion Batteries

Victron Energy BMS300200000 VE Bus BMS (original version)

On sale ~~$153.00~~ $130.05

Control system for Victron 12 Volt Lithium Ion battery banks

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p/n: BMS300200000

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Questions and Answers
What's in the Box
Additional information

The BMS is designed for use with Victron Lithium Iron Phosphate batteries. Its function is to manage the battery bank and prevent overcharging or over discharging.

Shuts down or disconnect loads in case of imminent cell under voltage, -
Reduces charge current in case of imminent cell overvoltage or over temperature (VE.Bus products only)
Shuts down or disconnects battery chargers in case of imminent cell overvoltage or over temperature.
The operating voltage range of the BMS is from 9 to 70V DC.
The VE.Bus BMS connects to a MultiPlus, Quattro or Phoenix inverter with a standard RJ45 UTP cable.
The Load Disconnect output can be used to control the remote on/off of a load or electronic relay
The Charge Disconnect output can be used to control the remote on/off of a charger, load relay or battery combiner

In the very basic wiring diagram below there is a generic battery charger with a charge relay to turn it off when necessary and a load relay that turns off when the battery is getting over discharged. This diagram is the most basic one and doesn't use the ability of the BMS to communicate on the VE Bus network

For a selection of more elaborate wiring schemes see the following Victron publication: Additional Li-ion battery circuit suggestions

Q: Can this be used with two banks one is lead acid and other day lithium ?

Asked by: mike - 3/17/2019

A: This BMS is ONLY for Victron Smart Lithium Batteries. It doesnt work with any other kind of batteries, not even with other brands of lithium battery. It has a data cable that connects to circuitry inside the battery.

Its quite normal to have a starting battery with a different chemistry. The BMS can control devices such as the Cyrix-Li-Ct that can combine the two different banks under certain circumstances but doesnt directly interact in any way with the lead acid battery itself.

My blog section on Lithium Batteries has more details

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Answer provided by: Peter Kennedy (3/18/2019)

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Q: Can I connect more than one Victron unit with a remote On/Off switch to the "Load disconnect" or "Charge disconnect" of the BMS? On the charge side I have a Skylla IP44 charger and a SmartSolar MPPT device - can these both be controlled by the "Charge disconnect" of the BMS? Similarly, on the load side I have three BatteryProtect devices - can al three simultaneously be connected to the "Load disconnect" of the BMS? If not, how should I connect these devices to the BMS? Thank you!

Asked by: Philip - 3/5/2020

A: Yes you can. You can daisy chain the connections or use a terminal block to join them up. This works for all the Victron items which have almost zero current draw on the control wire. If you are using third party devices you have to be sure that they don't exceed the current carrying capacity of the circuit.

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Answer provided by: Peter Kennedy (3/5/2020)

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Q: How many cells this bms can equalize ?

Asked by: luis demeneck - 7/21/2020

A: This BMS is ONLY for Victron Smart Lithium batteries. It can accept a string of 12 or 24 volt batteries up to a maximum nominal voltage of 48 volts, and it can accept a maximum of five strings of batteries. So in a 12 volt system you can have a max of five 12 volt batteries and in a 48 volt system you can have a max of twenty 12 volt batteries.

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Answer provided by: Peter Kennedy (7/22/2020)

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Q: Converting my 1999 Eurovan camper from ~100ah Lead Acid to 60-100AH LiFePO4. looking for simplest and most reliable system possible. Best recomendations? thinking battery + VE Bus BMS + Cyrix-Li-ct, unless battery has built-in BMS. Sound good? Factory wiring and minimal 12v appliances, no draw over 12v/10A continuous. Thanks!

Asked by: tbart - 7/31/2018

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Victron Energy BMS300200000 VE Bus BMS (original version)

Q: Can this be used with two banks one is lead acid and other day lithium ?

Q: How many cells this bms can equalize ?

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