There are usually four reasons why the solar street lampcan't light up at all. The common one is that the controller in the light pole is flooded and a short circuit occurs. Therefore, firstly check whether there are water marks and rust on the terminal of the controller. If this happens, it is most likely that the. After the solar street light has been used for a period of time, even if there is enough sun light at day, it may encounter that the lighting time of street light is short and the lighting cannot be provided. There are two reasons for this problem. First, if the light source is made with false welding, it is easy to cause this. Therefore, it is necessary to replace. When installing solar street lamp, some customers may encounter such a problem. The LED light source turns on as soon as it is installed and cannot be turned off. When this happens, first. There are many reasons for this phenomenon. First, you can replace a new lamp. If this problem persists after replacement, then there.