Which cable is best for solar panel?

Question

Cables and wires

Hello. I want to connect a 200 W solar panel to the batteries. There are two types of cable: with thick wires (1 fig.) and thin wires (2 fig.). Which cable is best for connection? So that there is less energy loss.

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Answer 1

To reduce losses, it is important not which cores, but which effective cross section (this is not the outer diameter), because the resistivity depends on it.
Also, you should pay attention to how you will connect this cable - you need a good crimp on the lugs.
The third possible problem is insulation: it must be designed for outdoor placement, otherwise it will fall apart from the sun.