BC300 incl Commlink

Part No: BC300 Category: Tag:


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BC300 Monitors all Connections Directly from the Battery

BMPRO BC300 External Shunt and CommLink provide additional battery monitoring for your BatteryPlus35 and J35 systems.

The BatteryPlus35 and J35 battery management systems allow high current loads and external charge sources to connect directly to the battery via the BC300 External Shunt.

This enhances system behaviour with temperature monitoring of the battery for excellent protection.

Key Features

  • High current/external charge  monitoring
  • Wireless Bluetooth communication to Commlink – easy to install/retrofit
  • DIY installation and simple pairing procedure

Connect these models below to your Smart Android Phone or iPhone via the Commlink.

commlink Front and rear view

Connection Sequence

BC300 ➙ Commlink ➙ J35 or BatteryPlus ➙ Smart Phone

BC300 Commlink

Battery Properties Monitored

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

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 the State of Charge.

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

Australian MadeSpecifications

Output 0.9/3.0/4.0 Amps
Input 240V, 50Hz
Battery Size 12-12 Ah
Type Lead Acid, LiFePO4
Battery Chemistry AGM, Gel, Calcium or Wet, LiFePO4
Charger Type Multi-stage
Power Supply Mode 12V

Note: After connection, depressing the right-hand button on the Commlink activates the Bluetooth connection between BC300 and the Management System

Tech Tips from David Bayliss

BC300 CommLink: This product is one of our top-selling items and continues to grow in popularity. Let’s look at why it is becoming such an essential addition to a battery management system.

The BC300 Commlink enables customers to utilise higher amp loads that cannot be connected directly to the Power Management Systems, such as the BP35 or J35 ranges.

Where loads can not be connected directly to a Power Management system and need to be connected directly to battery terminals – e.g. additional solar, inverter, CPAP machine – without a BC300 CommLink, the essential battery information on charging and discharging that these devices create is not captured. This potentially leads to incorrect readings on the user’s App or in RV displays such as Odyssey, JControl or Trek.

The Shunt and the CommLink

The BC300 Commlink consists of two parts  – the BC300 Shunt and the CommLink. The BC300 is the device attached to the negative of the battery terminal and measures voltage, amps, time and temperature, which are used in the calculations to provide the State of Charge (SOC) and State of Health (SOH) in conjunction with Time Remaining.

The Commlink connects to the Power Management system, such as the BP35 or J35, via a CAN cable and then communicates back down to the BC300 connected to the battery via BMPRO’s exclusive Bluetooth-enabled comms protocols.

Finally, once this data is available at the Power Management system level, it is converted to easy-to-understand battery status information vitally important when managing customers’ energy requirements.

BMPRO products are available from Couplemate in Wynnum, Queensland. Please get in touch with us before visiting to ensure we have sufficient stock.

Find the full range of BMPRO products below

Additional information

Weight1 kg
Dimensions20 × 13 × 5 cm

Our Service Lifetime Warranty

Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

Couplemate™ is a manufacturer and vendor of high-quality towing, trailer, and caravan components. Couplemate™ Core Goods and Custom Work are guaranteed to be free of defects for the service lifetime of the product when used as intended.

Warranties are non-transferrable and Couplemate™ requires satisfactory proof of purchase prior to issuing a remedy. The full Couplemate™ Warranty Policy can be found in the Terms & Conditions: Section 8 – Consumer Guarantees & Warranty.

Warranties are in addition to your rights under the Australian Consumer Law. If something is wrong with your order, please contact our team.

60-Day Returns

After 60 years of experience, we know that life has its unpredictable moments.

All Couplemate™ orders (online, over the phone, or in-store) have a 60 day period for change-of-mind returns and exchanges. There are some items that can’t be returned and some returns may incur a 15% restocking fee.

You can view our full policy for change-of-mind returns here.


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