REC Active Balancing BMS for 4 cells

Victron Compatible Option
RRP $599.00
In Stock

Customise Your Purchase


  • suitable for 4 cells
  • single cell voltage measurement (0.1 – 5.0 V, resolution 1 mV)
  • single cell - under/over voltage protection
  • single cell internal resistance measurement
  • SOC (state of charge) calculation & time remaining
  • SOH (state of health) calculation based on number of discharge cycles
  • over temperature protection (up to 2 temperature sensors)
  • under & over temperature charging protection
  • active cell balancing up to 2 A DC per cell
  • shunt current measurement (resolution 7.8 mA @ ± 200 A)
  • 2 galvanically isolated user defined multi-purpose digital output/input
  • 2 programmable relay (normally open or normally closed)
  • galvanically isolated RS-485  communication protocol
  • CAN communication
  • error LED + buzzer indicator
  • PC user interface for changing the settings and data-logging (optional accessory)
  • hibernate switch
  • one IP65 protected connector for all connections


  • Shunt
  • Contactors/pre-charge relays may be required
  • Battery Protect Units may be required.


Optionally add a Victron CANBus cable if connecting to a GX device.

See attachment below main image for the Victron manual. See the REC website for more details or the stand-alone ABMS (non-Victron manual) - and contact us for more information.

Note that the REC BMS is an entirely different class of BMS to the typical BMS in a fully enclosed LiFePO4 battery.   The REC BMS does not have internal MOSFETS, as it is intended to be used with any size battery and any charge/discharge current (within reason).    Compare this with a “typical BMS” with  MOSFETS where these are sized to suit the maximum charge/discharge currents.

Figure 1 of shows a “Victron architecture”.  The maximum charge and discharge currents are programmed (by REC for defaults) and can be modified by the user; these are sent in a CAN Bus message from the REC BMS to the Venus device which then sets the charge currents from the MPPTS & Multiplus so that it is compliant with the max current sent by the REC BMS.   At present the Victron DC DC charger cannot be controlled in this way, but it can be inhibited if cell voltages get too high.

Near full and near discharged, the REC BMS will throttle back the permitted charge/discharge current and the Venus will follow the reduced limit by reducing the charge current output by the MPPT and multiplus.

Similarly, for high/low temperature, and other situations listed in table 7 of the manual, the permitted charge/discharge current will be reduced to zero.


1 year

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