REC Battery Management System

To maximise LiFePO4 battery lifespan the cells in the battery must be kept within the voltage window as recommended by the manufacturer.    This requires a Battery Management System (BMS) that monitors the cell voltages and:

  • can balance the state of charge of the cells 
  • is able to inhibit charging to prevent cell overvoltage
  • is able to inhibit discharging to prevent cell undervoltage
  • is able to activate the above charge and discharge mechanisms in event of over/under temperature or other system issues
  • is configured (wired) to support long-term storage of the battery system with leakage currents in the micro-amperage range.
  • record occurrences of cell voltage exceeding low/high voltage limits  (note that our systems are designed to prevent this ever occurring)

4-Cell Active BMS

The REC Active BMS for 4 cells (nominal 12V battery) is a high end unit which, in conjunction with Solar4RVs designed opto-isolated adaptors and wiring guidelines provides all the necessary functionality to meet the LiFePO4 cell manufacturer's requirements for the BMS.  

16-Cell BMS

The 16-cell unit accommodates from 5 to 16 cells and has proven "plug-and-play" compatibility with SMA Sunny Island inverters (over 200 units are in operation with SMA inverters).


Bi-stable relay drivers (high/low side), pre-charge resistors, relays are available.

Support:   We support the REC BMS units across Australiia.   For example the REC BMS units are used on the Diesel-Electric hybrid Greenline boats for which we provide support.  

We work closely with the manufacturer and can provide rapid responses to requests for support and firmware upgrades.   

REC Bluetooth Low Energy (BLE) module

Connects REC BMS to your Android / Apple smart device


REC BMS MASTER UNIT 9M (special order)

Master + slaves with up to 240 cells in series


Relay Contactor SPST 500A 48VDC (32-95VDC) EV200ADANA with economiser

Use for battery isolation/disconnect switch


REC Cable DB9 to RJ45 for CAN-Bus

for CAN-Bus to Sunny Island inverters


REC BMS Slave BMS for 9M Master unit (special order)

For lithium battery packs with up to 195 cells in series


REC Sunny Island (SI) BMS + Temp sensor + Shunt Cable + CANBus Cable

For SMA Sunny Island, Studer Innotec Victron inverters


Full Kit: REC Active Balancing BMS for 4 cells

Electronic Unit + wiring harness


REC BMS LCD Touch Display

Suitable for 7R BMS, Q 16S BMS, Active BMS


BMS Current Sensor Shunt 500A 50mV

Suitable for 7R BMS, Q 16S BMS, Active BMS


BMS Current Sensor Shunt 300A 50mV

Suitable for 7R BMS, Q 16S BMS, Active BMS


BMS Current Sensor Shunt 200A 50mV

Suitable for 7R BMS, Q 16S BMS, Active BMS


REC Pre-charge Resistor and Relay 11-68V 2-11 Seconds 66R

Controlled inrush current flow for capacitive loads