6
2 INSTALLATION
2.2
BLUE wire - Source Select
The BLUE wire is provided to select whether the unit is charging from a vehicle
input or from a solar panel. This wire is monitored at all times.
2.1.1 Alternator
Input
To charge from an alternator, the BLUE ‘Source Select’
wire must be connected to the vehicle ignition.
When connected in this way, the charger will only
charge the auxiliary battery when the vehicle ignition
is ON, guaranteeing that the charger will not drain the
input battery.
For standard (non ‘LV’) models, the BLUE wire may be
permanently connected to the Input Source Positive
supply and the charger will only charge when the
alternator is running. This is not suitable for the
BCDC2420-LV.
2.1.2 Solar Input
The BCDC2420 is also capable of charging the auxiliary
battery from a Solar source. The unit will accept an
input directly from an unregulated 12V nominal solar
panels and act as a MPPT Solar Regulator. To select
the Solar charging mode, the BLUE ‘Source Select’
wire can either be left disconnected or connected to
GROUND.
OR
Blue Wire
Not
Connected
Blue Wire
OR
Vehicle
Ignition
non-‘LV’
models only
All models
Blue Wire
Blue Wire
Red Wire
Input
Source
Positive
Midi Fuse
