Pulse Width Modulation (PWM)
Charge controllers regulate the flow of current using high freqency switching that connects and disconnects solar panels to the batteries – and using the on- off- time time ratio to regulation the current flowing into the battery. As solar panels are at higher voltage than the batteries, the current flows from solar panels into the batteries.
Maxima PWM Charge Controller
Entry level controller with lots of important features like current sensors, digital display, USB)
Victron PWM Charge Controller
Sophisticated and rugged packed with all the features required for controlling PV charging and discharging in standard 12/24V dc systems)
MorningStar PWM Charge Controller
Morningstar PWM Controllers have set the standard for reliability and performance in demanding oilfield and mining installations in nearly 90 countries around the globe