[Xringer]

That charge controller looks pretty nice.. In section 4.1.1 How MPPT Works, it describes how regular MPPT works and then explains how "TrakMax’s MPPT technology operates in a very different fashion"..
It's pretty cool the way the unit can use your panels in series or parallel, and still pull the max-power-point power out of them..

Series has the advantage of lower current (higher voltage) and less amps means you can use smaller wires from the panels to the controller.. Easier to install, and cheaper too..