wBMS-R
The Wattius wBMS-R lineup is a compact Battery Management System developed to work with up to 32-cell lithium batteries while safely providing extended isolated interface possibilities.
Two models are available, wBMS-R24 for up to 24 cells, and wBMS-R32 for up to 32 cells. Monitoring and balancing with total maximum voltage measurement error of ± 2 mV for the entire range. It features state-of-the-art low power mode as well as integrated hardware and software diagnostics.
Multiple wBMS-R units can be connected in parallel without additional hardware. The system automatically handles string connection and provides a single control interface with the inverter / charger.
The wBMS-R protects the battery by driving up to 6 power contactors, calculates advanced parameters such as SoC and SoH and features multiple interface possibilities such as CAN bus, Bluetooth, and USB.
Connectivity
CANbus, Bluetooth & USB.
Real-Time logging of events, alarms and operation data to microSD card.
Monitoring, configuration & analysis with free wBMS-Toolkit PC software.
Performance
- Up to 32 cell measurement with ± 2 mV max. error.
- Ultra low power mode (< 35 mW).
- High-precision SoC algorithm.
- Up to 300mA autonomous balancing.
- EMC CE Class A & B compatible.
Safety
- Internal diagnostics and safety-critical redundant systems.
- Cell and relay open-wire detection.
| Power Supply | 10 – 36 Vdc < 15 mW in deep sleep mode Independent input for output supply |
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. |
| Balancing | 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. |
| 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. Channel 1-4: 2 A nominal, 4 A peak per channel. Channel 5-6: 1 A nominal, 2 A peak per channel. Adjustable PWM @ 10 kHz max. Open circuit, short-to-battery and short-to-ground detection. |
| Memory | Integrated redundant EEPROM to store system configuration and maximeter. MicroSD support (up to 32 GB). MicroSDHC Class 10 is recommended. |
| Operating temperature range | -40 to +85 ºC |
| Parallelization | Up to 16 devices in parallel without external hardware. |
| Dimensions | 70 x 150 mm |
| Power Supply | 10 – 36 Vdc < 15 mW in deep sleep mode Independent input for output supply |
Cell measurements (voltage & temperature) | Multiple cell chemistry and supercapacitors. Extended internal redundancy and hardware integrity diagnostics. Open wire detection. |
| Cell voltage | 5 – 32 cells. 0 – 5 Vdc. ± 1,5 mV cell voltage max total error. |
| Cell temperature | Up to 10 channels. Configurable NTC. ± 1 ºC cell temperature max total error. |
| Balancing | 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. |
| 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. Channel 1-4: 2 A nominal, 4 A peak per channel. Channel 5-6: 1 A nominal, 2 A peak per channel. Adjustable PWM @ 10 kHz max. Open circuit, short-to-battery and short-to-ground detection. |
| Memory | Integrated redundant EEPROM to store system configuration and maximeter. MicroSD support (up to 32 GB). MicroSDHC Class 10 is recommended. |
| Operating temperature range | -40 to +85 ºC |
| Parallelization | Up to 16 devices in parallel without external hardware. |
| Dimensions | 70 x 200 mm |
All wBMS models are compatible with the same wBMS-Toolkit, a free PC software that provides real-time monitoring of all BMS measurements, as well as configuration of thousands of parameters in a flexible and intuitive way.
Connection between wBMS-Toolkit and the devices can be established through USB, CAN bus, Ethernet or even Bluetooth.
