Maximum power point tracker (MPPT) charge controllers are the latest and best development in solar charge controller technology. These charge controllers assess the optimum operating voltage and amperage of the solar array and matches that with the battery bank. Essentially it converts a higher voltage DC output from the solar panels down to the lower voltage required to charge the battery array. The result is an additional 15-30% more power! Call a solar expert today with questions or for assistance at 866-274-0642