PWM vs MPPT Solar Charge Controllers
The charge controller is a key component of a solar power system and specifying the best one for the system requires some analysis. Below is a quick overview.​

 What’s the Difference?
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).
SUMMARY OF COMPARISON as below solarcraft.net/articles/comparing-pwm-and-mppt-charge-controllers/