12 | System Planning
AUXILIARY BATTERY AND COMMON GROUND CABLE
The auxiliary battery and common ground cable should be no longer than 2 m (6'6") and must be sized to
conduct the full rated capacity of your Manager 50/75/100. Refer to 'Main Unit Cable Selection' (page13)
for appropriate cable sizing based on the current capacity and cable length required for your setup.
START BATTERY CABLE
The maximum current drawn from the start battery can be congured via the Display in the BMS Settings
(DC Current Limit) to be at or below the maximum capacity of your Manager 50/75/100. The start battery
cable size must reect this conguration and meet the following requirements:
Must be tted with a fuse rated to protect the selected cable size.
Consider if the DC Current Limit will be re‑congured to a higher capacity, this may require a larger cable
and fuse size.
It is important to not re‑congure the DC Current Limit above the cable gauge and fuse rating installed,
as this will cause the fuse to blow and prevent the start battery from charging the auxiliary battery.
Consider recording the cable and fuse size used for the start battery connection in your system setup and
using the End‑User Lockout feature in the Congurator App (see 'End‑User Lockout' (page42)).
SOLAR CABLE
The solar cable must be sized to conduct the short circuit current of your solar panel/s, regardless if it is below
or greater than the Manager's maximum solar input current — refer to 'Electrical Specications' (page47).
If the solar panel/s combined short circuit capacity is greater than the Manager's maximum input current a
fuse may be required to protect the selected cable. If a fuse is required, mount as close as possible to the
positive busbar. For information on connecting multiple solar panels in your installation, refer to 'Connecting
Multiple Solar Panels' (page31).
NOTE: When connecting the Main Unit to a solar array, ensure the solar cable from the Main Unit to the solar
array is double insulated for safe operation (and to comply with AS/NZS 3001.2).
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