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Orion TR Smart 12/12-30 non isolated, NEGATIV connection

I want to install an Orion 12/12-30 non isolated to charge the auxilliary battery. Cable length for in- and out-put are approx. 2.5 meters. The recommended cable size is 16 mm2.

Now I am wondering about the size of the Negative wire. My understanding is that for the non isolated version there will be no major current on this wire (more like a sense wire). Is that correct and will 2.5 mm2 do it?

orion-tr smart
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