BC300 + CommLink

300A External Shunt


  • High current/external charge  monitoring
  • Wireless Bluetooth communication to Commlink – easy to install / retrofit
  • DIY installation and simple pairing procedure
  • Compatible with Lead Acid and LiFePO4 deep cycle batteries

Battery properties monitored:

  • Voltage
  • Current (charging / discharging)
  • Energy usage (Ah)
  • Temperature (not displayed)

$ 295

Monitor all connections direct to battery

BMPRO BC300 External Shunt and CommLink provides additional battery monitoring for your BatteryPlus35 and J35 systems. The addition of the BC300 to the BatteryPlus35 and J35 battery management systems allows high current loads and external charge sources to connect direct to battery via the BC300 External Shunt. This enhances system behaviour with temperature monitoring of the battery for greater protection.

BC300  also provides your BatteryPlus35 and J35 with additional information on battery usage so your displays such as the Trek, JControl and JHub are always up-to-date on battery Time Remaining and State of Charge.

The BC300 External Shunt and CommLink communicates via Bluetooth and CAN bus. The BC300 External Shunt is designed for 12V batteries up to 800AH in capacity. The shunt is rated for ±240A constant and 300A peak.

What our customers say:

We love our BC300 with CommLink. We both use CPAP machines and my wife uses a small hairdryer, so knowing where we sit with battery capacity, lid and charge rates is great. All reported on the JControl panel. Thanks BMPRO.

– Mark Simpson,Umina Beach, NSW

Weight 0.6 kg
Dimensions 20 × 14 × 6 cm


Voltage range 8-16V
Current range +/-300A
Capacity range 7-800 Ah
Compatible Battery Type Lead Acid, LiFePO4


Product Manual