6
THE LFP1225(LV) & LFP1240(LV)
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.
1.1.1 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 12v supply and
the charger will only charge when the alternator is
running. This is not suitable for the LFP1225-LV or
LFP1240-LV.
1.1.2 Solar Input
The LFP1225/LFP1240 is also capable of charging
the auxiliary 12V 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.
Blue Wire
Not
Connected
OR
Blue Wire
Vehicle
Ignition
OR
non-‘LV’
models only
All models
Blue Wire
Blue Wire
Red Wire
Input
Source
Positive
Fuse
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