WHAT IS A CHARGE CONTROLLER?
Solar Charge controllers regulate the power received from solar panels to charge your 12v batteries safely. There are two types of controllers, PWM (Pulse Width Modulation) and MPPT (Maximum Power Point Tracking).
WHAT ARE THE DIFFERENCES BETWEEN MPPT AND PWM?
The main differences between the two are the charging efficiency and cost. MPPT controllers are more efficient than PWM controllers at battery charging (MPPT: 90%+ efficiency; PWM: 0%-80% efficiency). PWM controllers are more inexpensive than their MPPT counterparts.MPPT units also have the capability of charging higher rated voltage battery banks such as: 24V , 48V , 72V, etc. and have an auto recognition feature.