the Under Voltage de-rated voltage (11.5V for a 12V system, 23V for a 24V system), the charger
will start to derate the output current. This function is used to compensate the use of long
or thin wire between the Input Battery System and the unit terminals. If the input voltage
continues to drop below the Under Voltage Shutdown Voltage (10.5V for a 12V system and
21V for a 24V system), the charging process will terminate and the unit will switch back to
charge from CH2 (PV). It will only switch back to CH3 if the CH3 voltage returns to 13.2V on
a 12V system or 26.4V on a 24V system.
Note B:
When the unit has activated the battery charging process using the Ignition Start terminal
or using the Manual Override through the unit setting, the input voltage specication is
reduced. It has the same charging process but with the Low Start-Up Voltage set to > 12.3V
(from 13.2V) on a 12V system and > 24.6V (from 26.4V) on a 24V system. The Low Under
Voltage Recovery Voltage is set to > 12V (from 12.8V) on a 12V system and > 24V (from 26.4V)
on a 24V system. During the 5 second rest period, if the input voltage returns above 12V/24V,
it will continue the charging process and if the input voltage did not return to > 12V/24V, it
will switch back to charge from the Solar - CH2 until the Start - CH3 input has returned to
the Low Start-Up voltage of 12.3V on a 12V system and 24.6V on a 24V system..
Also, during the 3 minutes charging process, if the measured terminal voltage drops to
below the Under Voltage de-rated limit (11.5V for a 12V system, 23V for a 24V system), the
charger will start to de-rated the charger current, this function is used to compensate the
use of long or thin wire between the Input Battery System and the unit terminals. If the
voltage continues to drop, and drops to below the Under Voltage Shutdown limit of (10.5V
for a 12V system and 21V for a 24V system), the charging process will terminate and the unit
will switch back to charge from CH2 (PV). It will only switch back to CH3 if the CH3 voltage
returns to 12.3V on a 12V system and 24.6V on a 24V system.
Note C:
The CH3 DC Input (Battery Input) can accept a 12V or 24V battery with an alternator system.
When the unit is rst 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
detect 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 it is Input
battery is disconnected or if the measured Input Voltage drops to < 7Vdc.
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