People who know the 20W solar street light controller know that the controller can be divided into two types: step-down and step-up. Then there will be confusion. How to judge whether to choose step-down or step-up?

First of all, we need to know where the voltage is going up and down respectively? You have to figure it out before you can judge. For example, now there is a 3.2V battery, and the voltage of the light panel is 6.4v. At this time, we know that the voltage of the battery is not enough to supply the light panel. At this time, we have two solutions. One is to increase the voltage of the battery to the voltage required by the light panel. The second is to reduce the voltage of the light panel to the voltage that the battery can provide It can also light up. Solar street light controller is one of the first solutions, which is mainly used to change the battery voltage.

So to judge whether the controller is step-down or step-up, it mainly depends on the voltage of the battery and the voltage of the light board. If the voltage of the light panel is lower than that of the battery, the voltage shall be reduced; otherwise, if the voltage of the light panel is higher than that of the battery, the voltage shall be increased.