On bigger systems, the positive bar where the charge sources (solar controller, DC-DC) land. Separating it from the load bar lets the battery cut charging and loads independently.
On a bigger system, giving the charge sources their own positive bar lets the battery management cut charging independently of the loads — and keeps electrical noise from chargers off your sensitive electronics.
The charge busbar collects the solar controller and DC-DC output, then links to the load busbar at the battery main. It is half of the charge/load bus split.
Design your van, boat, cabin or RV system in Wattonomy and it automatically splits the positive bus into a charge bar and a load bar once your system has two or more charge sources or a large bank — from the appliances you actually run, sized to the recognized standard for your region. You see it on the wiring diagram, in the sized parts list, and in a plain-English build pack that explains the reasoning behind every choice. No account, no email — about a minute to a complete, validated design.
When you have multiple charge sources (solar plus alternator) or a large bank. Wattonomy applies the split automatically at that threshold.
A link to the load busbar at the battery main, sized for the combined charge current so it can carry everything the chargers deliver.
It takes about a minute. No account, no email.