5
2 INSTALLATION
1. Wire the ‘Common Ground’ wire to a ground point that is common to both the
Start battery and the Auxiliary battery to be charged. This point may be on the
chassis of the vehicle, on the chassis of the trailer/camper/caravan or directly
wired to both batteries, depending on your installation requirements.
2. Wire the ‘Output Battery Positive’ to the Auxiliary battery positive terminal. Ideally
the BCDC unit should be a maximum of 1 metre in cable length from the battery
positive terminal, and should be wired with a minimum of 3mm² or 5mm auto
cable.
3. Wire the ‘Input Battery Positive’ wire to the Start battery positive terminal. Below
is a table outlining the required cable size for a given cable install length. Always
choose a wire diameter equal to or greater than what is specifi ed below.
NOTE: Appropriate sized fuses MUST be used to protect system wiring, values
noted above are a guide only and fuses should be determined according to
specifi c installation requirements.
Cable Install Length
(m)
Minimum Wire Size
(mm²)
Recommended Wire
Size (mm²)
Closest (BAE, B&S,
AWG or auto)
1 - 3 3 3.5 6mm auto
3 - 5 3 5.7 8 B&S
5 - 9 3 10.2 8 B&S
5. Wire the ‘Battery Type’ wire according to the type of Auxiliary battery you have
installed. This wire is monitored when the charger is not charging.
4. Wire the ‘Source Select’ wire according to your installation requirements. For
a setup charging from a 12V alternator, connect this wire to the ‘Battery Input
Positive’ wire. For a setup charging from a 24V alternator, connect this wire to
‘Ignition Input’.
Connection Battery type (Orange) Source select (Blue)
Positive supply Calcium 12V Alternator charge
Ground (Chassis earth) Standard Lead Acid N/A
Not connected AGM or Gel N/A
Ignition Input N/A 24V Alternator charge
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