The Wattius wBMS-R24 is a compact Battery Management System developed to work with up to 24-cell lithium batteries while safely providing extended isolated interface possibilities for multiple battery configurations.

The system has been designed to meet all relevant industry requirements such as the ISO26262 / IEC61508 and provides reinforced isolation according to EN50178. The wBMS-R24 provides state-of-the-art measurement and protection performance, high accuracy SoC and SoH estimation and onboard diagnostics, all in a compact 150 x 70 mm package.

  • CANbus, USB & Bluetooth Low Energy.
  • Real-time logging of events, alarms and data to micoSD card.
  • Monitoring, configuration & analysis with free wBMS-Toolkit PC software.
  • Up to 24 cell measurement with ± 1,5 mV max. error.
  • Ultra low power mode (< 15 mW).
  • High-precision SoC algorithm.
  • Up to 300mA autonomous balancing.
  • EMC CE Class A & B compatible.
  • ISO26262 / IEC61508 & EN50178 compatible design and components.
  • Internal diagnostics and safety-critical redundant systems.
  • Cell and relay open-wire detection.
Electric mobility
Industrial & AGV

Power Supply

10 – 36 Vdc

< 5 mW in deep sleep mode

Independent input for output supply

Maximum system voltage

800 Vdc (EN50178, reinforced isolation)

Compatible with transformerless stationary ESS use cases.

Cell measurements

(voltage & temperature)

Multiple cell chemistry and supercapacitors.

Extended internal redundancy and hardware integrity diagnostics.

Open wire detection.

Cell voltage

5 – 24 cells. 0 – 5 Vdc.

± 1,5 mV cell voltage max total error.

Cell temperature

Up to 6 channels. Configurable NTC 10 kΩ.

± 1 ºC cell temperature max total error.


Autonomous. Configurable. Up to 300 mA per channel.

Current sensing

External 0 – 5 Vdc hall current sensor. < ± 0,1 mV.

CAN Interface

CAN bus 2.0 A/B (Up to 1Mb/s). Referenced to external power supply.

Configurable termination resistor with switch.

CANopen compatibility.

Other interfaces

Mini USB 2.0

Bluetooth 5.0 Low Energy.

General Input

2x analog / digital (configurable) signal up to 36 Vdc.

4x dry contact digital input.

Configurable to multiple functions (ignition key, HVIL, relay feedback etc.).

General Output

6x independent channels.
External supply voltage. Maximum total output 4 A. External fuse recommended.

Channel 1-4: 2 A nominal, 4 A peak per channel.

Channel 5-6: 1 A nominal, 2 A peak per channel.

Adjustable PWM @ 1 kHz max.

Open circuit, short-to-battery and short-to-ground detection.


Integrated redundant EEPROM to store system configuration and maximeter.

microSD support (up to 16 GB).

Data logging

Continuous logging of cell data. Event / error / alarm log.


Up to 16 devices in parallel without external hardware.


70 x 150 mm

With the wBMS-Toolkit PC software multiple configuration parameters can be tuned to work with different types of cells, architectures and use cases, as well as providing an excellent tool to monitor the system and access diagnostic and debug information.