16 | System Planning
BATTERY MONITOR REQUIREMENTS
LUG REQUIREMENTS
The Ground (GND ) and Battery Negative (B NEG –) terminals on the Battery Monitor have M10 screw
threads. Select lugs for a 10 mm (3/8") stud and a cable barrel that suits the required cable gauge.
The Ground (GND
) terminal is capable of connecting multiple loads, for important lug requirements and
instructions see page27.
NOTE: If installing the lugs to the Battery Monitor terminals facing downwards, select a lug with a tongue that
is long enough to cover the shunt surface. This is to ensure that there is no interference between the ramped
section of the lug and the shunt. See page36 for more information.
M10 Thread M10 Thread
20 mm
(0.8")
≥ 6 mm
(1/4")
M10 (3/8")
Stud Hole
CABLE REQUIREMENTS
CAUTION: If undersized cables are used, overheating of cables could cause damage (including re)
and charging performance will likely be compromised.
BATTERY NEGATIVE CABLES
Appropriate battery negative cables are required for the Battery Negative (B NEG
–) and Ground (GND )
terminals on the Battery Monitor. These cables are used to connect the Battery Monitor to the auxiliary battery
and to the common ground — see page26 and page27.
The Battery Negative cables should be no longer than 1 m (3'3") to minimise the voltage drop between the
Battery Monitor and auxiliary battery. Refer to the table below to determine a suitable cable gauge for this
connection based on the current your system has.
NOTE: Your auxiliary battery's negative connection is made via the Battery Negative (B NEG
–) terminal on
the Battery Monitor.
IMPORTANT: The following table should be used as a reference only, considerations when selecting an
appropriate cable for your installation include:
Cable length
Peak current draw
Time spent at high current
Environment ambient temperature
System Current 100 A 200 A 300 A 400 A 500 A
Maximum Cable Length 1 m (3'3")
Recommended Cable
Cross Section
35 mm² 70 mm² 95 mm² 120 mm² 150 mm²
Closest Equivalent
AWG/BAE/B&S
2 3/0 4/0 250 kcmil 300 kcmil
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