Use these to connect your battery banks so that the load is spread better and your batteries will last longer. You will need 2 per bank, 1 for Positive and 1 for Negative. We have an example of how to wire these on our instlation diagrams page
We can make them as 5 way or 7 way if you prefer. Please specify this when you order if you want a smaller one.
Here is an example of wiring your batteries using the bus bar: