I have seen diagrams that show lithium battery banks connected in all three ways shown below. For my install, Option 1 would be easiest.
Are there any meaningful differences between these three methods that make 2 or 3 the preferred choice?
This site is now in read-only archive mode. Please move all discussion, and create a new account at the new Victron Community site.
I have seen diagrams that show lithium battery banks connected in all three ways shown below. For my install, Option 1 would be easiest.
Are there any meaningful differences between these three methods that make 2 or 3 the preferred choice?
Option 1 (and 3 as they are the same) will cause battery in-balance issues as the battery closest to the Multiplus will be used the most and the one the longest distance away the least. This happens because the resistance of the cable is higher when the cable is longer. (also the reason for so-called 'voltage-drop' when using too thin cables and therefore higher resistance)
I would say option 2 is almost correct; the cable from Multiplus to last battery terminal should be equal comparing negative cable and positive cable length.
So the cable between Multiplus and first negative terminal (of the top battery) in option 2 drawing should be the same length as the cable between Multiplus and first positive terminal (of the lowest battery) in option 2 drawing.
See also https://www.victronenergy.com/blog/2019/09/03/wiring-unlimited/
Additional resources still need to be added for this topic
Did You Know - How to create a battery profile for non-Victron batteries?
Additional resources still need to be added for this topic
27 People are following this question.