Those who know about the solar street lamp controller know that the controller is divided into two types: pressure reduction and pressure increase. That will lead to a confusion. How to judge whether to choose to boost or reduce the pressure?
First of all, we need to know where the voltage rises and falls respectively? You need to be clear before you can judge. For example, there is a 3.2V battery, and the voltage of the lamp panel is 6.4V. At this time, we know that the battery voltage is not enough for the lamp panel. At this time, we have two solutions. One is to increase the battery voltage to reach the required voltage of the lamp panel; The second is to reduce the voltage of the lamp panel to the voltage that the battery can provide, so that it can also light up. Solar street lamp controller is one of the first solutions, mainly used to change the battery voltage.

Therefore, whether the controller is step-down or step-up depends mainly on the battery voltage and lamp panel voltage. If the lamp panel voltage is lower than the battery voltage, choose to reduce the voltage; otherwise, if the lamp panel voltage is higher than the battery voltage, choose to increase the voltage.