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5. UNIT OPERATION
Unit ON/OFF
There are three ways to turn ON the unit:
• Using the unit Power push button switch located on the main unit and on the Display Panel:
Press and hold the green Power push button switch on the main unit or 'Power' push button
switch on the Display Panel for approximately one second to activate the charger. When the
unit is not in use, press and hold the Power switch on the main unit or the 'Power' push button
on the Display Panel until the display shows 'PWR OFF' to turn unit off. These two power
switches share the same function to control the unit on/off. They are not the power switches
to disconnect the power connection to AC Input of the AC Charger and the two DC Inputs of
the DC Charger.
• Using the Ignition Start Port:
The unit can also be turned ON by using the positive rising edge on a > 8V voltage signal
provided to the Ignition start signal. After the unit is turned ON, the unit will remain ON even
if the signal is removed.
• Using the Solar Input Port (CH2):
The unit can also be turned ON by providing a > 20v signal to the solar input port (CH2).
There are two ways to turn OFF the unit:
• Using the Power push button on the main unit or on the Display panel:
Press and hold the Power push button switch for approximately one second or on the Display
panel to turn OFF the charger. The Power switch is a signal switch and not a main power
switch to disconnect the connections between the DC Inputs and the DC Output of the unit.
• Using the Automatic Unit OFF function:
With AC utility input not available and when charger senses both CH2 and CH3 input are out
of operating range or not available, the unit will automatically turn OFF in 3 minute to avoid
the sustained current being drawn from either the house battery or the alternator battery.
Note: If the 'Ignition Start Port' is connected with high voltage signal, both the Power push button
and the Automatic Unit OFF function cannot be used to turn the unit OFF.
Understanding the Charging Mechanism
The Charger is powered by the battery connected to the House Battery or by the AC Input
connected to the AC Power source. If No AC Power source is available, the unit requires a
minimum of 8Vdc from the House battery to operate.
Operating from an Alternator/Starter Input (CH3)
The CH3 DC Input (Alternator/Start Battery Input) will accept a 12V or a 24V Input battery with an
alternator system. When the unit is first connected, the unit will measure the input voltage. If the
voltage is > 17V, it will assume it is connected to a 24V Input Battery/Alternator system. If the
voltage detected is < 17V, it will assume it is connected to a 12V Input Battery/Alternator system.
Once detected, it will store this into the microprocessor, and it will only be erased if the Input battery
is disconnected or if the measured Input Voltage drops to < 7Vdc.
Input Voltage Range
Start-Up Voltage CH3 setting (Note A)
Under Voltage Recovery Voltage (Note A)
De-Rated Voltage (with load) (Note B)
Under Voltage Shutdown Voltage (with load) (Note B)
Over Voltage Shutdown
Over Voltage Recovery
Input Battery System Reset Voltage (Note C)
Maximum Input Current (CH3)
Note A: This voltage setting determines the start-up voltage for charging the house battery through the alternator. This setting
is for use with P1, P3, P5 and P6 only. Once this threshold is met, the house battery will start charging from the alternator.
If the alternator voltage drops to below the 'Under Voltage Recovery Voltage', the charger will go to an Alternator Input
Voltage checking process. It will start to charge for 3 minutes and then stop charging for 5 seconds. By the end of 5
seconds, the unit will check CH3 voltage. If the voltage rises to above the 'Under Voltage Recovery Voltage', it will carry
on charging the House battery. But if the voltage does not rise to above the 'Under Voltage Recovery Voltage', it will
terminate the charging process and depending on the priority setting, the House battery may switch to charge from CH2
solar input or charge again from the alternator if the alternator voltage bounces back to above the 'Start-Up Voltage'.
Normal Operation
Alternator/Starter Input (CH3)
12V INPUT Source
10.5 – 16.0V
11.5 – 13.8V
0.4V below Normal
Start-Up Voltage
11.5V
10.5V
16.0V
15.5V
< 8V
50A
24V INPUT Source
21.0 – 32.0V
25.4 – 27.4V
0.8V below Normal
Start-Up Voltage
23.0V
21V
32V
31V
< 8V
50A
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