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Victron miniBMS /smallBMS NG

Protects 12V/24V/48V LiFePO₄ Batteries with M8 Connectors


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DESCRIPTION

Victron smallBMS NG: Advanced Battery Management for Victron Smart LiFePO₄ Systems

Compact, Reliable Protection for 12V, 24V, and 48V Lithium Setups

The Victron smallBMS NG is a next-generation battery management system engineered to safeguard Victron Smart LiFePO₄ batteries with M8 circular connectors. This compact unit delivers essential cell-level monitoring and control, preventing damage from over-voltage, under-voltage, and temperature extremes. Unlike generic BMS solutions, the smallBMS NG integrates directly with Victron’s ecosystem, ensuring precise communication and reliable operation in mobile, marine, and off-grid applications.

Designed for 12V, 24V, and 48V systems, it operates across a wide 8–70V DC range, making it suitable for diverse installations. The unit draws minimal current—as low as 1.2 mA in remote-off or low-cell-voltage states—reducing parasitic drain on your battery bank.

Key Features

  • Load Disconnect Output: Normally high (Vbat – 0.1V), sources up to 1A to drive external relays or contactors, protecting against deep discharge.
  • Pre-Alarm Warning: Provides a 30-second early alert before load disconnect, allowing time for graceful system shutdown or generator start.
  • Charge Disconnect Output: Normally high, sources up to 500mA to control compatible chargers or Cyrix-Li relays, preventing over-charge and over-temperature conditions.
  • Remote On/Off Control: Flexible input via Remote L/H terminals for external switching, enabling integration with system-level controls.
  • LED Status Indicators: Blue 'Load ON' and red 'Temp or OVP' LEDs provide at-a-glance system status without additional monitoring tools.
  • Compact, Durable Enclosure: ABS matt black housing (106 x 42 x 23 mm, 0.1 kg) with IP20 rating, suitable for protected indoor installations.

Why Choose the smallBMS NG?

This BMS is purpose-built for Victron Smart LiFePO₄ batteries, eliminating compatibility risks associated with generic battery management systems. It ensures your lithium investment is protected by precise, factory-matched thresholds. The pre-alarm feature reduces the risk of unexpected system shutdowns, while the charge disconnect output prevents charger-induced damage. With its low power consumption and robust signal outputs, the smallBMS NG is ideal for caravans, marine vessels, and remote off-grid systems where reliability is critical.

Note: This unit does not include a VE.Bus interface and is not intended for direct control of VE.Bus inverter/chargers such as MultiPlus or Quattro. For those applications, consider the Victron VE.Bus BMS.

Ready to Protect Your Lithium Battery Bank?

Integrate the Victron smallBMS NG into your energy system today for dependable, automated battery protection. Whether you're upgrading an existing setup or building a new off-grid solution, this BMS provides the essential safeguards to maximise battery lifespan and performance.


SKU: VIC-BMS400100300

SPECIFICATIONS

ProductsmallBMS NG
Operating voltage (Vbat)8 – 70 Vdc
Power supply cable and fuse (not supplied)
Recommended fuse size0.3 A - 2.5 A, dependent on devices connected to Load disconnect and pre-alarm output
Current consumption, remote on3mA (excluding Load and Charge disconnect output current)
Current consumption, low cell voltage1.2 mA
Current consumption, remote off1.2 mA
Load disconnect output Normally high (Vbat – 0.1 V) Source max current: 1 A (not short circuit protected) Sink current: 0 A (output free floating)
Charge disconnect output Normally high (Vbat – 0.1 V) Source max current: 500 mA (not short circuit protected) Sink current: 0A (output free floating)
Pre-alarm output Normally free-floating (low) In case of alarm: output voltage Vbat -0.1 V Maximum output current: 500 mA (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 (2.9V < VH < Vbat) 4. OFF in all other conditions
GENERAL
Operating temperature range-20 to +50 °C (0 – 120 °F)
HumidityMax. 95 % (non-condensing)
Protection gradeIP20
ENCLOSURE
Material and colourABS, matt black
Weight0.1 kg
Dimensions (h x w x d)106 x 42 x 23 mm
STANDARDS
SafetyEN 60950
EmissionEN 61000-6-3, EN 55014-1
ImmunityEN 61000-6-2, EN 61000-6-1, EN 55014-2
Automotive RegulationUN/ECE-R10 Rev.4 - pending

SKU: VIC-BMS400100300
Barcode: 8719076063537
Model #: BMS400100300
MPN: BMS400100300

WARRANTY

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.

Transport 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.

Severability 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.

Exotronic provides high-quality products and solutions tailored for B2B and commercial customers, including commercial businesses, caravan manufacturers, marine electricians, OEMs, as well as emergency services, and more.

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