Rated 4.9 out of 5

Customer Reviews

REC Active BMS

From: $329.95

Active BMS for 12V Systems. WS500 compatible. Be sure to include the custom wiring harness with cell &
relay wires, CAN and RS485 cables, temp. sensor wires (2), and remote ON/OFF switch, unless you are just replacing a unit or doing a custom installation.


Designed to provide unsurpassed battery
management in 12 volt systems, the REC Active BMS delivers 2A
cell equalizing with active balancing and synchronous flyback bidirectional energy transfer from cell to pack and pack to cell.


  • Li-PO, LiFePO4, LiFeYPO4, LiCoO2, LiMnNiCo and LiMnO4 Lithium-Ion chemistry
  • 4 series connected cells per unit
  • high efficiency 2 A bi-directional active balancing (pack to cell and cell to pack)
  • IP65 protection enclosure, AMP 35 pin water resistant connector
  • 2 – 5 V measuring range, 2 mV accuracy
  • up to 2 digital temperature sensors
  • shunt current measurement
  • robust and small design
  • galvanically isolated RS-485 and CAN communication protocol
  • two programmable fused relay output
  • two programmable fused digital output
  • ON/OFF switch
  • LED and buzzer status indication
  • bootloader
  • error LED + buzzer indicator
  • PC user interface for changing settings, data-logging and firmware update
  • compatible with REC LCD touch display for monitoring
  • compatible with Victron inverters for solar applications
  • Seamless CANbus integration with Wakespeed’s WS500 Advanced
    Alternator Regulator


  • low power microcontroller RTC
  • custom made software with bootloader for remote firmware update
  • 60 mW self power consumption with disabled CAN and all outputs

RS – 485 communication:

  • galvanically isolated RS-485 communication
  • Slave configuration
  • RS-485 driver primary side supply is activated with Master connection to save energy consumption
  • fully compatible with REC LCD touch display and PC user interface BMS Master control

Active Balancing:

  • 2A cell equalizing with active balancing with synchronous flyback bi-directional energy transfer: cell to pack and pack to cell
  • top side and bottom side balancing prolong the cycle duration due to the weakest cell


  • two fused relay outputs with NO and NC pins
  • two fused galvanically isolated/non-isolated digital outputs with PWM option

Galvanically Isolated CAN:

  • galvanically isolated CAN
  • 100, 125, 250, 500, 1 MHz bit-rate selection
  • message programming
  • disable option

Complete wiring of ABMS connector:

  • 5 cells wires (l = 1m)
  • relays, digital output wires (l = 0.5m)
  • RS485 cable (l = 0.5m)
  • CAN cable (l = 0.5m)
  • remote ON/OFF switch (l = 1m)


Weight 1.0 kg
Dimensions 20 × 25 × 10 cm


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