The solar charge controller is used to regulate the charging and discharging process in the solar system. Its main function is to control the charging current flowing from the PV panel to the battery, and keep the current not too large to prevent the battery pack from overcharging. There are two types of solar controllers on the market: MPPT solar controller and PWM solar controller.
MPPT stands for Maximum Power Point Tracking, which is a technology to track and regulate the output energy from solar panels to batteries. PWM is the abbreviation of Pulse Width Modulation (Pulse Width Modulation), which is a technology that modulates the pulse width under specific rules to change the voltage and frequency of the solar panel\'s output energy to charge the battery. The mppt controller has a higher conversion rate (up to 99%), and the 3-stage charging is healthier for the battery, but the price is high; while the PWM controller has a simple structure, mature and reliable technology, and is cheap and cost-effective, but The conversion rate is lower than that of MPPT pairs.
In general, the MPPT controller is indeed better than PMW in terms of functionality. But goodness and suitability are two different concepts.
Which charge controller is best for you?
The MPPT charge controller is suitable for solar power generation systems larger than 2kw. Due to its powerful functions, it can save you costs by reducing other costs.
The PWM charge controller is suitable for small solar off-grid power systems that do not require many functions and have a small budget. If you just want to provide a basic and economical controller for small lighting systems, then the PWM controller is your best choice.