Redarc BCDC1240 - Page 7

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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
BCDC1225-LV or BCDC1240-LV.
2.1.2 Solar Input
The BCDC1225/BCDC1240 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