What is the Difference between PWM and MPPT Solar Charge Controller?

Quick quide to choosing the right charge controller for your PV system.jpg

Seeing that Solar Energy is the new trend these days, I am sure you must be curious about Solar Charge Controller. But before moving to PWM and MPPT Solar charge controller, let me give you a brief idea of what it is meant for. Solar Charge Controller, in layman terms, can be thought of as a regulator or a controller that prevents the solar panels from overcharging.

These controllers are not anything new in the market. As a matter of fact, they have been here since the very existence of Solar Panels. Whereas in earlier days, the method was more of a simpler approach. The controller started/stopped the power connectivity between panels and batteries as per requirement.

But now we’ve moved into a new era, right? So things were bound to change even for these humble Solar Charge Controllers as well. Since we were presented with the mighty PWM and MPPT Solar Charge Controllers, they have dominated the market ever since.

Now the question arises: “Which is better of these two?” Let’s check out…

PWM and MPPT Solar Charge Controller

PWM stands for Pulse Width Modulator that can be imagined as a switch being turned on or off at certain intervals as per the requirement. Now PWM Solar Charge Controllers work in the same manner. The regulator connects the solar panel and batteries at varied time intervals.

Let’s see how:

If the solar panel is fully charged, the PWM Controller will disconnect the batteries to keep it from overcharging. Also, this method makes sure that the solar panel is always charged at the standard voltage level.

PWM Charge Controller

Power Curve For a PV Panel With Charging Ranges for PWM Controllers

Now coming to MPPT Solar Charge Controllers, MPPT or Maximum Power Point Tracking Solar Charge Controller is a more convenient and improved way to regulate the solar panels and batteries’ connectivity.

It uses digital electronic tracking to compare the output level of Solar Panels with the Battery Voltage. Henceforth, this gives the optimized voltage level at which the panel should be charged.