Solar Charge Controllers
The solar charge controllers functions as a voltage regulator, carrying the energy from the solar panels to the batteries at the correct voltage level. They help prevent the batteries from overcharging, short-circuiting, and block reverse currents.
Now that you know what size solar controller to look for, identify which type of solar charge controller is right for your application: MPPT or PWM.
MPPT Solar Charge Controllers:The MPPT (Maximum Power Point Tracking) solar controller is the shining star of today's solar systems. These controllers actually detect the optimum operating voltage and amperage of the solar panel array and match that with the battery bank. The result is additional 15-30% more power out of your solar array versus a PWM solar controller. Although the MPPT solar charge controller is more expensive than its PWM counterpart, it is generally worth the investment for any solar electric system over 200 watts.
PWM Solar Charge Controllers:A PWM (Pulse Width Modulated) solar charge controller is the traditional style. They are robust, inexpensive and widely used in solar panel applications. PWM shunt controllers are used less often and mostly in applications where electrical interference is an issue.