Wiring Safety Precautions - Victron energy SmartSolar MPPT 75/10 Manual

1.2. Wiring safety precautions

Use flexible multi-stranded copper cable for the battery and PV connections.
The diameter of the individual strand of the cable used should not exceed 0.4mm (0.016 inch) or have a
surface area exceeding 0.125mm² (AWG26).
A 25mm² cable, for example, should have at least 196 strands (class 5 or higher stranding according to VDE
0295, IEC 60228 and BS6360). An AWG2 gauge cable should have at least 259/26 stranding (259 strands of
AWG26). Example of suitable cable: class 5 "Tri-rated" cable (it has three approvals: American (UL),
Canadian (CSA) and British (BS)).
In case of thicker strands the contact area will be too small and the resulting high contact resistance will cause
severe overheating, eventually resulting in fire. See below figure for examples of what cable to use and not to
use.
The maximum operating temperature is 90°C (194°F).
The grounding terminal is located in the wiring compartment and is identified by this symbol:
For MC4 models only: The maximum current rating of a MC4 connector is 30A
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MPPT solar charger manual
Safety precautions