i. Solar Charge Controller with PWM Technology:

Traditional solar regulators featuring PWM (Pulse Width Modulation) charging operates by making a connection directly from the solar array to the battery bank. During bulk charging when there is a continuous connection from the array to the battery bank, the array out put voltage is pulled don to the battery voltage. The battery voltage adjust slightly up depending on the amount of current provided by the array and the size and characteristics of the battery.

ii. Solar Charge Controller with MPPT Technology:

MPPT controllers feature buck post converter technology, designed to quickly and accurate determine the Vamp(maximum power voltage) of the solar array. MPPT controllers Sweep the solar input to determine the voltage at which the array is producing the maximum amount of power. The controllers harvest power from the array at the Vmp voltage and convert it down to battery voltage, boosting charging current in the process.