TrakStar Maximum Power Point Tracking (MPPT) Technology is an advanced control algorithm used in Morningstar's TriStar MPPT and SunSaver MPPT solar controllers. TrakStar technology maximizes the energy harvest from the solar into the batteries by repeatedly re-evaluating the optimal voltage point for the solar panel array to working at and even knows how to recognize multiple operating voltage points when there's shading on the solar array. Morningstar's MPPT solar charge controller technology enables you to use less expensive thin films modules, use thinner cable that cost less (because of higher input voltages) and up to a 30% increase in performance from your solar panel array when your battery bank is really low.