Victron toolkit app This App helps you calculate cable size and voltage drop. You can select: • voltage • cable length • current • cable cross section • And the app will calculate the voltage drop over both cables. The app can be downloads from here.
Recommended battery cables document This document contains a table that shows the maximum current for a number of standard cable where the voltage drop is 0.259 Volt. The document can found here.
Rule of thumb For a quick and general calculation for cables up to 5 meters use this formula:
Current / 3 = cable size in mm 2
Example: Current is 200A Then the cable needs to be: 200/3 = 66mm 2
4.2 Busbars Busbars are like cables only the are rigid copper bars. They are used in large systems where larger currents flow. They are used as a common positive and common negative point between the batteries and multiple inverters. But busbars are also used in smaller systems, especially when there are a lot of DC equipment. A busbar in this case provides a nice location to connect all the various DC cables to. To calculate busbar thickness, simply use the recommended cable surface area and apply that to the bus bar cross section area.
surface area = with x depth
For example: A busbar of 10mm x 5mm The surface area cross section is 5 X 10 = 50 mm 2
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