Using The J35 As A Power Supply (Battery-Less Operation); Fault Protection - BMPRO J35 Owner's Manual

If your battery is heavily discharged, disconnect it from the J35 and charge with
a stand-alone charger. Reconnect the battery once the battery voltage has
recovered to normal levels.
Heavily Discharged Batteries (LiFePO4) (J35 Model D only)
The J35D can recover and charge a heavily discharged LiFePO4 battery. The
internal Battery Management System (BMS) of a LiFePO4 battery will turn off if it
detects that the battery is heavily discharged. The J35D will provide the voltage to
restart the LiFePO4 battery's BMS and then commence charging of the LiFePO4
battery.

USING THE J35 AS A POWER SUPPLY (BATTERY-LESS OPERATION)

The J35 will act as a power supply if the following conditions are met:
1. A battery is not connected to the J35, and
2. The J35 is connected and powered from mains, or
3. The J35 is connected and powered from AUX input
Power Supply mode allows you to control and power your caravan's loads directly
from mains or AUX without the need to connect the caravan battery. When
powered from the mains, the J35 provides an output voltage of 12.8V. When
powered from an AUX input, the output voltage will vary depending on the AUX
input voltage.

FAULT PROTECTION

Overload or Short Circuit Protection
If an overload or short circuit is detected, the affected output will shut down. The
J35 will automatically attempt to restart the output every 30 seconds until the
fault is removed.
Over-Voltage or High Internal Temperature Protection
If an over-voltage or high internal temperatures are detected the J35 will
automatically turn off. Once the over-voltage is rectified, or the internal
temperature drops to normal levels, the J35 may be restarted by cycling the mains
input on and off.
Reverse Battery Protection
The J35 Battery fuse and fuse fitted by your Jayco dealership at the battery
protects from accidentally connecting the battery to the J35 in reverse polarity.
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