User Manual

7. UNIT OPERATION

Understanding The Charging Mechanism

Note 1: The Charger is powered by the battery connected to DC Output (CH1) and also

supplied by CH2 or CH3 if available. The display will turn o to save power when Input

Channel CH2 and CH3 are out of operating range.

Operating from a Start Battery / Alternator (CH3)

Normal Operation:

Input Battery / Source

12V Input 24V Input

Input Voltage Range 10.5V – 16.0V 21.0– 32.0V

Normal Start-Up Voltage (Note A) > 13.2V > 26.4V

Normal Under Voltage Recovery Voltage (Note A) > 12.8V > 25.6V

Ignition Sense Terminal

Ignition Sense Terminal must see

a minimum of 10.5V to trigger low

voltage “Priority Mode”.

Low Start-Up Voltage (using Ignition Sense Terminal or

using Manual Over-ride setting) (Note B)

> 12.3V > 24.6V

Low Under Voltage Recovery Voltage (Note B) > 12.0V > 24.0V

De-Rated Voltage (with load) (Note C) 11. 5 V 23.0V

Under Voltage Shutdown (with load) 10.5V 21.0V

Over Voltage Shutdown 16.0V 32.0V

Over Voltage Recovery 15.5V 31.0V

Input Battery System Reset Voltage (NoteD) < 7V < 7V

Maximum Input Current - EN3DC40+ 30A 30A

Note A:

When the battery is charging through CH3 with normal operation (not through Ignition

or override setting), the charger will charge for 3 minutes, it will then rest for 5 seconds to

verify the Input voltage.

During the 5 seconds rest period, if the measured voltage is >12.8Vdc on a 12V System

(>25.6Vdc on a 24V system), the unit will continue the charging cycle through CH3.

If the measured voltage on CH3 is <12.8Vdc (<25.6Vdc on a 24V system), the unit will

disconnect from the vehicle source and switch back to charge from CH2 (solar if installed)

until the CH3 voltage returns to >13.2Vdc on a 12V System (>26.4V on a 24V system).

Also, during the 3 minutes charging process, if the measured terminal voltage drops below

<11.5V for a 12V system, (<23V for a 24V system), the charger will start to derate the output