Solar street lamps said very easy to understand, is a street lamp lighting use solar energy to provide electricity. That is to say, it is only in a case with sunny, to fully charged battery, lighting in the night. But we also learned that in rainy weather, solar street light can still bright light at night, this is the reason why do it? Reason is that at the time of design, solar street lamps need to consider the local use of solar street lights and solar energy resources, environmental factors such as climate, then know the situation, can reasonable collocation of solar street light system configuration, in the case of sufficient sunlight, the use of solar panels convert power and storage capacity of the battery, and then in the rainy day, in the energy stored in the storage battery is converted to electrical energy use. This is because this reason, the solar street lights can meet the local in the rainy day, still can offer local lighting. To can lighting lasts more than one rainy day, it is not because thus skimping and reduce configuration requirements for solar street lamps, which can easily lead to continuous rainy days, solar street light not bright lights.