MPPT charge controllers allow your
solar panels to operate at their optimum
power output voltage, improving their performance by
as much as 30%. They can also match the output of the
solar panels to the battery voltage to insure maximum
charge (amps). MPPT charge controllers are
more expensive that PWM charge controllers,
but the advantages are worth the cost. If you can afford
it, you should definitely use an MPPT charge
controller.