Battery Management System


  • 7 x 12VDC outputs
  • 20A maximum output current

*Battery chemistry can only be altered or changed with the use of a ControlNode103/JHub or JControl

This product is specifically designed for and exclusively supplied in a range of Jayco recreational vehicles.


12V Power and Battery Management System for Jayco Australia

J35 Model A is a 12V battery management system with a multi-stage battery charger, with total current of 20 Amp. J35A is specially designed for Jayco recreational vehicles, replacing ST-II and ST-III series.

With J35A, you can charge your battery to the optimal charge level from AC mains or from Auxiliary (DC or vehicle power). A maximum DC charging current is 15 Amp.

J35A preserves the health of the battery by inhibiting it from getting overly discharged.

Other protection and operating features keeping your battery healthy include: thermal protection, over-current, over-voltage, multi-stage charging, low-voltage disconnect. There’s no need for external fuses thanks to the built in electronic fuses protecting the loads. There are seven outputs to connect your DC appliances.

J35A also allows to connect battery monitors and controllers, such as JControl.

Product Specifications

Input Voltage Range: 240 VAC nominal, ± 10%, 50-60 Hz
Input Surge: < 40 A (cold start)
Output Current:  20A 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: 20A to 25A (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
Ambient: 0°C – 50°C
Weight: 2 kg
Dimensions: 282 x 203 x 65
Standards: Safety: IEC60335-2-29, IEC62109-1,UL458, CSA, C22.2 No.107-1, EMC: CISPR 14, IEC61000-3-2, IEC61000-3-3 Approvals: RCM, UL, cUL


The J35 does not serve as a DC-DC charger. We offer the MiniBoostPRO, which is a DC-DC charger that can connect to the J35.


No, you cannot. Lithium and lead-acid batteries require different charging profiles to keep charged and will not work together. It is best to use the same type of batteries, brand, model, and date manufactures to get the best overall performance.