I am installing 6.3kW of solar panels. The system consist of 18 350w panels, 6 panels on each of 3 pole top arrays. I have to do it this way because I live at at 49 degrees N and there is a slight upwards slope to the south with some fairly tall trees at the top. The panels will be mounted vertically so the top row of panels on all three poles will start generating power earlier than the bottom row. One of the reasons I went with the panels I chose is there ability to start putting out power before the entire panel is in the sun. Starting this month and through mid February this will be a significant advantage for me.
My question is how to connect them to my pair of Smartsolar 250/85 controllers. I will be using 6 strings of 3. Do I make the top row of panels on each pole as one string and connect those 3 strings to one controller? Or is better to try to balance the input so that each controller is getting roughly the same amount of power at about the same time?