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

For SMA Sunny Island, Studer Innotec Victron inverters

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  • Electronic unit
  • External temperature sensor
  • Cable from Electronic unit to current shunt
  • CAN bus cable from electronic unit to SMA Sunny Island



  • robust and small design
  • 5 – 16 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 and SOH calculation
  • over/under temperature protection (up to 4 temperature sensors)
  • passive cell balancing 4.3 Ω
  • 18-bit shunt current measurement (resolution 7.8 mA @ ± 200 A)
  • galvanically isolated user defined multi-purpose digital output
  • programmable relay (normally open)
  • galvanically isolated RS-485  communication protocol
  • CAN Bus communication
  • error LED + buzzer indicator
  • hibernate switch
  • 1 s measuring interval
  • balancing transistors defect check @ restart
  • EEPROM memory data corruption check @ restart
  • cell's voltage RMS voltage measurement
  • self calibration @ restart
  • BMS shutdown @ 0.98 x minimum cell disconnect threshold
  • Ah counting

Data communications

RS485 protocol and messages are fully defined in manual - can be programmed using Hyperterminal or similar

RS485 message checksum is CRC-16   0x8005   x16 +x15 +x2 + 1

CAN Bus messages are fully defined in manual - sent to SMA Sunny Island

PC Master Control Software

Available as an option

Touch screen display

Available as an option





Product Function and Performance

Product Weight and Dimensions

Shipping Weight and Dimensions

Shipping Weight 0.8200kg
Shipping Width 0.180m
Shipping Height 0.100m
Shipping Length 0.250m
Shipping Cubic 0.004500m3

1 Year

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