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Solar MPPT System
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Cable Description
Substantial power loss and reduced battery operating time results from inverters installed with wires that are not
sized correctly based on the length and the current required to be carried. Current flowing through a wire
produces voltage drop along its length due to the resistance of the wire and due to the value of the currentcarried
through it. The resistance of the wire is inversely proportional to the cross-sectional area of the wire (designated
in mm2 or AWG) and directly proportional to its length i.e. thinner and longer wire has higher resistance and
hence, produces higher voltage drop. Similarly, thicker and shorter wire has lower resistance and hence,
produces lower voltage drop. Hence, symptoms of low DC input voltage / battery power can result from wires that
are either excessively long or have an insufficient cross-sectional area (designated in mm2 or AWG).
1）The wires should be sized based on the maximum current they are required to carry and the distance
between the battery and the inverter to limit the voltage drop to 2% to 5%.
2）Wires are rated based on its insulation, temperature and operating environment. Please ensure that
the wire insulation is of the appropriate type for the operating environment.
3）The installer/operator should be especially aware of the requirements to maintain secure, tight, water-
resistant electrical connections and to provide for strain relief for DC wires and appliance wiring.
CAUTION
1) Ensure that appropriate terminal lugs are used and are properly crimped / soldered at the bare ends of the
wires for secure connections.
2) Ensure that the inverter's power switch is turned off and that no flammable fumes are present.
3) Identify the Positive (+) and Negative (-) terminals of the 12V battery or other DC source.
4) Connect the selected length of Positive wire between the Positive terminal of the battery(or other DC source)
and the Positive(+) terminal of the inverter.
5) Connect the selected length of Negative wire between the Negative terminal of the battery (or other DC
source) and the Negative (-) terminal of the inverter.
6) Check to be sure that all connections are secure and tight.
7) Test the inverter by turning it on and plugging in a 100 Watt lamp or equipment.
8) If the inverter is not properly operating, then refer to the Troubleshooting Guide.（In the attached form
2022004-2）
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