greater than 2.5Vdc. Re-charging a dead battery requires extreme care and attention. It is
best to re-charge using short frequent cycles rather than one long bulk cycle. Battery
damage or failure may occur if the battery is discharged so deeply.
Understanding the Display Code
Codes will show on the display when either a function or internal warning / fault, such as high
internal temperature or DC out-of-range is detected and the charger may shut down to protect
itself until the fault has cleared. See table description below for more information.
The charger is in Bulk Charging Mode
Bulk or Boost charge: The battery is charged at full rated output current of the charger until the
battery reaches its final charging voltage, known as its absorption voltage. In this step,
approximately 80% of the battery is recovered as fast as possible.
The Charger is in Absorption Charging Mode
Absorption charge: With the charger voltage held steady, the remaining 20% is replaced with
the charger allowing the current to taper off as the battery approaches full charge.
The Charger is in Float Charging & Power Supply Mode
Float Charge: Finally, in the float stage the charger voltage is lowered and held at a constant
and safe predetermined level. This prevents the battery from being overcharged, yet allows the
charger to supply enough current to make up for the self-discharge losses of the battery, while
supporting any additional loads connected to the battery (such as DC lighting and refrigerators).
This stage allows for the charger to be used as a DC power supply.
CH3 Input Voltage Check
This will display for 5 seconds every 3 minutes while charging from the alternator input (CH3)
and is normal operation when the charger is checking the under-voltage recovery limit (see page
10 for details).
CH3 High Input Voltage Shutdown
This means the unit has detected the input from the Start/Alternator has gone above 16.0V on a
12V input or 32.0V on a 24V input. This error will clear once the input has dropped below 15.5V
on a 12V input or 31.0V on a 24V input.
CH3 Low Input Voltage Shutdown
This means the unit has detected that the input from the Start/Alternator has gone below 10.5V
on a 12V input or 21.0V on a 24V input. This error will clear once the input has risen above 13.2V
on a 12V input or 26.4V on a 24V input.
If you have this error:
• Check the voltage of your Start Battery is above 13.2v on a 12V input or 26.4V on a 24V input.
• Check you have not left the “Priority” (Override) feature activated (Manual or Auto)
• Check the battery cable from the Start Battery is correctly sized.
• Check you don’t have a loose terminal or blown fuse.
CH2 High Input Voltage Shutdown
This means the unit has detected the input from the solar has gone above 48.0V. This error will
clear once the input has dropped below 44.0V.
If you have this error:
• Check the specification of your panels – the Volts Open Circuit (VOC) should not exceed
45VOC
• Make sure the solar panels have not been connected in series as this will increase the VOC
voltage of the panel array. Please Note: Maximum solar VOC input must not exceed 45VOC or
damage to the unit will occur.
CH2 Low Input Voltage Shutdown
The unit has detected the input from the Solar Array cannot sustain voltage above 14.5V.
If you have this error:
• Check that you are not in a low light/non- direct sunlight situation i.e. early morning /late
afternoon.
• This may also happen if your solar panels are inside of a shed with a skylight or outside under
Flood Lights.
If you find this is happening with your unit when stored, we recommend fitting a DC breaker to
the output of the Charger and turning it off when the unit is not in use.
CH1 High Input Voltage Shutdown
This means the unit has detected that the Main/House battery has gone above 16.0V. This error
will clear once the input has dropped below 15.5V.
This may be due to charging from another source. i.e. Another solar controller or AC battery
charger.
Over Temperature Shutdown
When the charger senses the environmental temperature above 60°C, the charger will lower
close down. It will recover automatically when the environmental temperature drops below 45°C.
• Check to make sure the fan is working.
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