Types of Solar Charge Controllers

The two types of charge controllers most commonly used in today’s solar power systems are pulse width modulation (PWM) and maximum power point tracking (MPPT).


Size of the System

Low power systems are better suited to a PWM controller because:

PWM controller operates at a relatively constant harvesting efficiency regardless of the size of the array

PWM controller is less expensive that a MPPT, so is a more economical choice for a small system

MPPT controller is much less efficient in low power applications. Systems 170W or higher tickle the MPPT’s sweet spot

MPPT controller is quite expensive but give maximum power to batteries from panel and has less cable loss


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