System Planning | 11
MAIN UNIT REQUIREMENTS
LUGS
CAUTION: Avoid using the top facing terminals, doing so may strain and damage the cables.
The top facing terminals also provide less contact area for the lugs, impacting the performance and
operation of the Manager.
On the Main Unit, the auxiliary battery, common ground, start battery and solar terminals have M6 screw
threads. Select lugs for an M6 (1/4") stud hole and a cable barrel that suits the required cable gauge. Ensure
that the lug tongues do not exceed the maximum dimensions shown below.
≤14.4 mm
(9/16")
M6 (1/4")
Stud Hole
M6 Thread
(9/16")
CABLE LENGTH AND GAUGE CONSIDERATIONS
When selecting the auxiliary battery, common ground, start battery and solar cable sizes for your
installation, consider the maximum expected currents for each connection.
The table below highlights the maximum current each cable connection can carry for each Manager model.
See page12 for further guidance before selecting cable sizing for your setup.
NOTE:
The start battery current is congurable from 5 A up to the maximum current of the Manager 50/75/100 in
the BMS Settings screen on the Display — cable size must reect this conguration (DC Current Limit).
The solar cable is sized based on your solar panel/s short circuit current, below highlights the maximum
current capacity of the Manager 50/75/100.
Manager 50/75/100 Maximum Current Capacity
Terminal BMS12050 BMS12075 BMS12100
Auxiliary Battery
50 A 75 A 100 A
Common Ground 55 A 82 A 110 A
Start Battery
55 A 82 A 110 A
Solar
55 A 82 A 110 A
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