VE.Bus BMS
VE.Bus BMS
www.victronenergy.com
Protects each individual cell of a Victron lithium iron phosphate (LiFePO4 or LFP) battery
Each individual cell of a LiFePO4 battery must be protected against over voltage, under voltage and over
temperature.
Victron LiFePO4 batteries have integrated Balancing, Temperature and Voltage control (acronym: BTV) and
connect to the VE.Bus BMS with two M8 circular connector cord sets.
The BTVs of several batteries can be daisy chained. Up to ten batteries can be paralleled and up to four
batteries can be series connected (BTVs are simply daisy-chained) so that a 48V battery bank of up to
2000Ah can be assembled. Please see our LiFePO4 battery documentation for details.
The BMS will:
VE.Bus BMS
-
shut down or disconnect loads in case of imminent cell under voltage,
-
reduce charge current in case of imminent cell overvoltage or over temperature (VE.Bus products
only, see below), and
-
shut down or disconnect battery chargers in case of imminent cell overvoltage or over
temperature.
Protects 12V, 24V and 48V systems
The operating voltage range of the BMS: 9 to 70V DC.
Communicates with all VE.Bus products
The VE.Bus BMS connects to a MultiPlus, Quattro or Phoenix inverter with a standard RJ45 UTP cable.
Other products, without VE.Bus can be controlled as shown below:
Load Disconnect
The Load Disconnect output is normally high and becomes free floating in case of imminent cell under
voltage. Maximum current: 2A.
The Load Disconnect output can be used to control
-
the remote on/off of a load, and/or
-
the remote on/off of an electronic load switch (Battery Protect) and/or
-
a Cyrix-Li-load relay.
Charge Disconnect
The Charge Disconnect output is normally high and becomes free floating in case of imminent cell over
voltage or over temperature. Maximum current: 10mA.
The Charge Disconnect output can be used to control
-
the remote on/off of a charger and/or
-
a Cyrix-Li-Charge relay and/or
-
a Cyrix-Li-ct Battery Combiner.
LED indicators
-
Enabled (blue): VE.Bus products are enabled.
-
Cell>4V or temperature (red): charge disconnect output low because of imminent cell over
voltage or over temperature.
-
Cell>2,8V (blue): load disconnect output high.
Figure 1: Application example for a vehicle or boat.
A Cyrix Li-ion Battery Combiner is used to connect to the starter battery and alternator.
The UTP cable to the inverter/charger also provides the minus connection to the BMS.
VE.Bus BMS
Input voltage range
9 – 70V DC
Current draw, normal operation
10 mA (excluding Load Disconnect current)
Current draw, low cell voltage
2mA
Normally high
Source current limit: 2A
Sink current: 0 A (output free floating)
Normally high
Source current limit: 10mA
Sink current: 0 A (output free floating)
Load Disconnect output
Charge Disconnect output
GENERAL
VE.Bus communication port
Two RJ45 sockets to connect to all VE.Bus products
Operating temperature
-20 to +50°C
Humidity
0 - 120°F
Max. 95% (non-condensing)
Protection grade
IP20
ENCLOSURE
Material and colour
ABS, matt black
Weight
0,1kg
Dimensions (h x w x d)
105 x 78 x 32mm
STANDARDS
Standards: Safety
Emission
Immunity
Automotive
EN 60950
EN 61000-6-3, EN 55014-1
EN 61000-6-2, EN 61000-6-1, EN 55014-2
Regulation UN/ECE-R10 Rev.4
Figure 2: Application example for a vehicle or boat, without inverter/charger.
Six Cyrix Combiners especially designed for use with the VE.Bus BMS:
Cyrix-Li-load (120A or 230A)
The Cyrix-Li-Load will prevent frequent switching when a low cell voltage is followed by a higher voltage after
loads have been switched off.
Note: instead of a Cyrix-Li-Load, a BatteryProtect may also be used (see figure 2).
Cyrix-Li-ct (120A or 230A)
Is a battery combiner with a Li-ion adapted engage/disengage profile and a control terminal to connect to the
Charge Disconnect of the BMS.
Cyrix-Li-Charge (120A or 230A)
Is a unidirectional combiner to insert in between a battery charger and the LFP battery. It will engage only
when charge voltage from a battery charger is present on its charge-side terminal. A control terminal connects
to the Charge Disconnect of the BMS.
Victron Energy B.V. | De Paal 35 | 1351 JG Almere | The Netherlands
General phone: +31 (0)36 535 97 00 | Fax: +31 (0)36 535 97 40
E-mail: [email protected] | www.victronenergy.com
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