PWM and MPPT controller have their own advantages and disadvantages. The circuit structure of PWM controller is simple and reliable, and the price is cheap. MPPT controller is more powerful, it has the maximum power tracking function, the price is higher than PWM, the component utilization rate of MPPT is higher than PWM, small-scale off grid system can use PWM controller, large-scale off grid system is recommended to use MPPT controller, in general, no one is the best technology, you can choose the right controller according to your own needs.