Not to hijack but this brings up a question I have. So let's say you have two (or three) controllers as mentioned. When it comes to distribution through load or to the battery, how is that handled?
I think the simplest way would be to wire the controllers to busbars, where they connect up with the rest of your system. If you think about how you would normally wire panels in parallel, it would be similar to that, just on the other side of the charge controller. Another way to think about it would be that it would be just like wiring a single charge controller, just replicated 2 or 3 times or however many controllers you put in parallel.