How is DC cable sizing and voltage drop calculated?
Easy PV returns the smallest cable cross-sectional area that achieves a voltage drop less than 1% of the voltage across the cable (or the largest cable if none do).
The voltage drop along a cable is the product of the current running through it and its resistance. We calculate cable resistances using the stranding class 1 and 2 values from the IEC 60228/BS 6360 stranding chart.