A solar charge controller is an electronic device that regulates the voltage and current from solar panels to a battery bank. Its primary functions are to:
Prevent overcharging of the batteries by limiting the amount of current and voltage.
Protect the batteries from being over-discharged.
Ensure the battery is charged safely and efficiently, which helps to extend its lifespan.
The specific model shown in the image is designed for "solar off-grid systems" and is available in two versions: ZS20-15A and ZS20-20A.