The popular solar controllers on the market mainly include ordinary solar controllers, PWM solar controllers and MPPT solar controllers.

The ordinary solar controller is the first generation technology. The working principle is to directly connect the output of the solar panel to the battery port. When the battery is full, it will be disconnected. Because of the internal resistance of the battery, it is difficult to fully charge the battery, and the solar panel If it is not fully utilized, the charging conversion efficiency is only 70-76%, which has been eliminated by the market and is basically used by few people.
PWM solar controller is the second generation technology, which is the most on the market now. The working method is PWM control. Compared with ordinary solar controller, it has made a lot of progress and can solve the problem of battery dissatisfaction. The charging conversion efficiency is 75-80%. , but the solar panels are not fully utilized.
MPPT solar controller is the third generation technology, the most high-end solar controller. MPPT solar controller refers to a solar controller with "Maximum PowerPoint Tracking" function, which is an upgraded product of PWM solar controller. MPPT solar controller can detect the voltage and current of the solar panel in real time, and continuously track the maximum Power (P=U*I), so that the system always charges the battery with the maximum power, the MPPT tracking efficiency is 99%, the power generation efficiency of the whole system is as high as 97%, and it has excellent management of the battery, which is divided into MPPT charging, constant Voltage equalization charge and constant voltage float charge. With the advancement of technology and energy saving, the trend of MPPT solar controller to replace traditional PWM solar controller is irreversible.