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Cable loss DC calculation


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We have a internal discussion about how to calculate DC cables. 

I have been told that it its 2 way (go and return) including the extra lenght of the connection cables.

My colleague thinks it is one way including modules. 


In PV-Sol there is been written 1x go and return.

What length must i put in with a 100mtr from inverter to module to calculate te totall loss.

is it

(a) 100 + connection cables modules. ±140mtr

(b) 100 + connection cables and return ±260mtr

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Hi Andreas,

if you have 100m distance between the inverter and the modules, you have to enter 200m cable length go-and-return, 100m for the (+) cable and 100m for the (-) cable. Often, the (+) cable and the (-) cable do not have the same length due to the conditions at the installation location, so we decided to have the user just put in the total length.

The length of the module cables must not be included in the DC cabling length, as these are already taken into account in the PV module datasheet. The electrical properties of the PV modules are always measured at the end of the module cables, so the resistance of the module cables is already included.

Hope that helps, kind regards,


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