What is a PWM solar charge controller?

PWM (Pulse Width Modulation) solar charge controllers are electronic devices used in solar energy systems to protect the battery. These devices connect the solar panels to the battery to prevent it from overcharging and over-discharging.

Do PWM solar controllers work?

PWM solar controllers work particularly well in very scorching where the benefits of MPPT modules are reduced significantly. The PWM controller can only be used in systems where the solar panel output matches the battery voltage. This is probably one of the type’s biggest drawbacks.

How do PWM solar panels work?

PWM types are relatively simple, using a switch between the PV array and the battery. The switch is able to open and close rapidly, thus being able to pulse or “throttle back” the electricity coming from a solar panel in order to taper off the charge current as the batteries become full.

Which panel is best for a PWM controller?

The best match for a PWM controller: The best matching panel for a PWM controller is a panel with a voltage just above provided for charging the battery and taking into account the temperature, usually, a board with a Vmp (maximum voltage) of about 18V to charge a 12V battery.

Do you need a PWM controller for a solar array?

Even with a nominal voltage array, a PWM controller will operate below the maximum power voltage (Vmp). When it’s cold outside or when the battery voltage gets low, a PWM controller will operate well below Vmp and the max power (Pmp) rating of the solar array. To take full advantage of a PV array’s maximum power output, you need an MPPT controller.

How does a PWM charge controller work?

In other words, PWM charge controllers regulate the power produced by the solar panels by lowering the average DC voltage when necessary. These devices control the average DC Voltage at the terminals of the battery by simply turning ON and OFF. The image below shows what the output signal of a PWM charge controller looks like: