Victron miniBMS: The Cost-Effective Battery Management Solution

Discover the Victron miniBMS, a straightforward and budget-friendly alternative to the VE.Bus BMS, designed for seamless integration with Victron Smart LiFePo4 batteries. While it doesn't support VE.Bus MultiPlus and Quattro inverter/chargers due to the absence of a VE.Bus interface, the miniBMS excels in various applications with its three distinct outputs, mirroring the functionality of the VE.Bus BMS.

Load Disconnect Output for Enhanced Control

The Load Disconnect output, maintaining a normally high state, transitions to free floating under cell under-voltage conditions (default 2.8V/cell, adjustable between 2.6V and 2.8V per cell), with a maximum current capacity of 1A. This output, not safeguarded against short circuits, is ideal for managing:

  • High current relays or contactors.
  • The remote on/off inputs of Battery Protects, inverters, DC-DC converters, or other loads, ensuring compatibility with various devices (refer to our detailed manual for specific cable requirements).

Pre-Alarm Output for Early Warning

Featuring a normally free-floating pre-alarm output that activates under imminent cell under-voltage scenarios (default 3.1V/cell, adjustable between 2.85V and 3.15V per cell), this function provides a crucial early warning with a 1A maximum current (not short circuit protected) and a minimum 30-second delay before load disconnect.

Charge Disconnect Output for Safe Charging

The Charge Disconnect output, typically high, becomes free floating to signal imminent cell over-voltage or over-temperature conditions, with a 10mA maximum current. This output, unsuitable for powering inductive loads like relay coils, facilitates:

  • Remote on/off control of chargers.
  • Integration with Cyrix-Li-Charge relays and Cyrix-Li-ct Battery Combiners, ensuring a versatile and safe charging environment.

System On/Off Input for Simplified Operation

Control the system effortlessly with the on/off input, affecting both outputs to ensure loads and chargers are deactivated when necessary. This feature accommodates a variety of control methods, including direct connections between terminals Remote L and H or adjustments to battery plus/minus.

Comprehensive Protection Across Voltage Systems

Designed to safeguard 12V, 24V, and 48V systems with an operating voltage range of 8 to 70V DC, the miniBMS offers versatile protection for a wide array of power setups.

Intuitive LED Indicators for Immediate Status Updates

  • Load ON (Blue): Indicates active load output (cell voltage >2.8V, adjustable on the battery).
  • Temp or OVP (Red): Signifies the charger output is free floating due to cell over-temperature (>50°C), under-temperature (<5°C), or over-voltage conditions.

Optimize your energy system with the Victron miniBMS, the economical choice for advanced battery management. Visit our website for detailed manuals and further information on integrating the miniBMS into your Victron energy setup.

Victron Energy Limited Warranty Policy

Victron Energy warrants its products to be free from defects in workmanship and materials for a period of 5 years from the date of purchase by the end user, with a maximum of 66 months from the Victron Energy invoice date. Exceptions on this are: lead acid batteries; 2 years from date of purchase by the end user, with a maximum of 30 months from the Victron Energy invoice date, Lithium-ion batteries; 3 years from date of purchase by the end user. In addition to this proof of correct battery usage is required when making a battery warranty claim.

During this period, Victron Energy will, at its option, repair or replace the defective product free of charge. The warranty does not include performing or reimbursing de‐installation, transportation and re‐installation. This warranty will be considered void if the unit has suffered any physical damage or alteration, either internally or externally, and does not cover damages arising from improper use like:
• Reverse of battery polarity.
• Inadequate connection.
• Mechanical shock or deformation.
• Contact with liquid or oxidation by condensation.
• Use in inappropriate environment (dust, corrosive vapor, humidity, high temperature, biological infestation...).
• Breakage or damage due to lightning.
• Connection terminals and screws destroyed or other damages, like overheat, due to insufficient tightening.
• For any electronical breakage except due to lightning (reverse polarity, over‐voltage due to external cause), the state ofthe internal control diode and of the inputs/output X and Y capacitors determine the warranty.

This warranty will not apply where the product has been misused, neglected, improperly installed, or repaired by anyone else than Victron Energy or one of its authorized Qualified Service Partners. In order to qualify for the warranty, the product must not be disassembled or modified.

Repair or replacement are our sole remedies and Victron Energy shall not be liable for damages, whether direct, incidental,special, or consequential, even caused by negligence or fault.

Victron Energy owns all parts removed from repaired products. Victron Energy uses new or reconditioned parts made by various manufacturers in performing warranty repairs and building replacement products. If Victron Energy repairs or replaces a part of a product, its warranty term is not extended. In case of replacement the new component has a warranty of 6 months, without effect on the initial warranty period. All remedies and the measure for damages are limited to the above. Victron Energy shall in no event be liable for consequential, incidental, contingent orspecial damages, even if having been advised of the probability of such damages. Any and all other warranties expressed or implied arising by law, course of dealing, course of performance, usage of trade or otherwise, including but not limited to implied warranties of merchantability and fitness for a particular purpose, are limited in duration to a period of two (2) years from the date of purchase.

Life Support Policy
As a general policy, Victron Energy, does not recommend the use of any of its products in life support applications where failure or malfunction of the Victron Energy's product can be reasonably expected to cause failure of the life support device or to significantly affect its safety or effectiveness. Victron Energy does not recommend the use of any of its products in direct patient care. Victron Energy will not knowingly sell its products for use in such applications unless it receives in writing assurances satisfactory to Victron Energy that the risks of injury or damage have been minimized, the customer assumes all such risks, and the Liability of Victron Energy is adequately protected under the circumstances.

As a product requires service, it must be brought back to the place of purchase. In case no contact can be taken with the merchant, or if he is either unable or not allowed to provide service, direct contact should be taken with Victron Energy.

Warranty on Repairs
The warranty period on products or on printed circuits boards repaired by Victron Energy as well as on printed circuit boards for replacement is 6 months from delivery by Victron Energy.

It is the responsibility of the sender to sufficiently package these products. The transport must be organized in a way to avoid any damage, especially when a single unit or heavy unit is sent.

If a part of the terms and conditions set out above is held invalid, void or unenforceable due to any particular national or international legislation, it shall not affect other parts of the terms and conditions remaining.

For Australia only
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.


Product smallBMS with pre-alarm BMS400100000
Operating voltage (Vbat) 8 – 70 VDC
Power supply cable and fuse (not supplied) Recommended fuse size 0.3 A - 2.5 A, dependent on devices connected to Load disconnect and pre-alarm output
Current consumption, remote on 2.2 mA (excluding Load and Charge disconnect output current)
Current consumption, low cell voltage 1.2 mA
Current consumption, remote off 1.2 mA
Load disconnect output Normally high (Vbat – 0.1 V) Source current limit: 1A (not short circuit protected) Sink current: 0A (output free floating)
Charge disconnect output Normally high (Vbat –0.6 V) Source current limit: 10mA (short circuit protected) Sink current: 0A (output free floating)
Pre-alarm output Normally free floating In case of alarm: output voltage Vbat -0.1 V Maximum output current: 1A (not short circuit protected)
Remote on/off Remote L and Remote H Use modes: 1. ON when the L and H terminal are interconnected 2. ON when the L terminal is pulled to battery minus (V <3.5 V) 3. ON when the H terminal is high (2.9 V <VH <Vbat) 4. OFF in all other conditions
Operating temperature range -20 to +50 °C (0 – 120 °F)
Humidity Max. 95 % (non-condensing)
Protection grade IP20
Material and colour ABS, matt black
Weight 0.1 kg
Dimensions (h x w x d) 106 x 42 x 23 mm
Safety EN 60950
Emission EN 61000-6-3, EN 55014-1
Immunity EN 61000-6-2, EN 61000-6-1, EN 55014-2
Automotive Regulation UN/ECE-R10 Rev.4