J35B-L 20A Lithium Battery Management System

Part No: J35B-L Category:


1 in stock

1 in stock

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J35B-L Lithium Battery Management System

Australian made campaignThe BMPRO J35B-L lithium battery power management system gives you control over your caravan’s house lithium battery and 12V appliances.

Please Note: – Installation is carried out only by suitably qualified personnel.

BMPRO J35 offers all-in-one solutions, including a power supply and distribution board for 12V loads, an intelligent charger, and multiple battery protection features with built-in LVD and automatic fuses.

Couplemate stock BMPRO products in Queensland. For Technical Help, please call BMPRO Customer Support on 03 9213 8430

Jayco caravans feature J35 series power management systems, while other leading brands install the BatteryPlus35 series.

Designed and manufactured in Australia, caravan power management systems are highly reliable and efficient solutions for your recreational vehicle.

Compatible Battery Monitors

  • J35A is no longer available.

J35 battery management system

J35 Battery Power Management System Model B-L

Key Features

  • 4 x 12VDC outputs
  • 35A maximum output current
  • 29A solar input current
  • Lithium (LiFePO4) compatible

J35 Model B-L is an intelligent power management system with a distribution system and a multistage battery charger. J35B-L model has been specially designed for Jayco and can be found on-board modern caravans and motorhomes.

Use J35B-L BMS for charging 12V Sealed Lead-Acid (SLA) batteries, including valve-regulated lead-acid (VRLA) batteries, both absorbed glass mat (AGM) and gel batteries.

The BMPRO battery management system is also compatible with lithium batteries (LiFePO4). The power supply can deliver 35A maximum to the battery and loads.


Charge your battery to the optimal charge level from AC mains, solar panels, or auxiliary (DC or vehicle power). A maximum DC charging current is 15 Amp.

A multistage battery charger includes bulk, absorption, float, and periodic boost charging modes to ensure long battery life.

The J35B-L System supports up to 300W panels with an open-circuit voltage between 18 and 28 VDC.

J35B-L keeps your battery healthy for a long time thanks to the multiple battery protection features, such as low voltage disconnect and storage mode.

Built-in electronic fuses protect the loads. You can also use up to 14 outputs to connect your appliances, including hot water, water pump, lights, etc.

They will allow you to get access to monitoring your power supply status in a handy location. Moreover, when used with the ControlNode103, J35B-L is SmartConnect-ready and monitors multiple Bluetooth sensors via the JHub app.


  • Input Voltage Range: 240 VAC nominal, ± 10%, 50-60 Hz
  • Input Surge: < 40 A (cold start)
  • Output Current:  35A Continuous (load + battery current)
  • Factory Set Voltage: 13.65 V ±2% (Float voltage)
  • Output Ripple Voltage: < 150 mV
  • Over Voltage Protection: < 18 V
  • Over Current Protection: 35A to 38A (load + battery current)
  • Battery Current Limit: 15A max
  • Battery Connect: 10.8 ± 0.2 V
  • Low Voltage Disconnect: 10.8 ± 0.2 V
  • Battery Drain after LVD: < 8mA
  • Efficiency: > 83 %
  • Cooling Fan: Thermally controlled
  • Solar Input Current: < 20A
  • Solar Input Voltage: 15V to 25 V
  • Ambient: 0°C – 50°C
  • Weight: 2 kg

BMPRO battery management 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 Battery Management products

Additional information

Weight5.1 kg
Dimensions35 × 25 × 8 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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