PWM  

PWM Solar Charge Regulators
PWM controllers are the most used in standalone photovoltaic installations. They improve the recharging of the batteries. To complete the full recharge, they separate the current provided by the panels and sends it to the batteries in the form of pulses. These pulses are modulated (+ or - long, + or - frequent) by the precise reading of the regulator at the terminals of the battery. This allows him to know his level of charge.
The role of the PWM regulators is not only limited to the complete recharging of the battery, they also make it possible to limit the sulphation of the battery plates thanks to the high frequency pulses. There are several kinds of PWM controllers, some have basic functions and others more complex, are equipped with software that constantly manage the state of the battery