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The battery accessories of solar LED street lamps are a problem that must be paid attention to because it is a battery. Without this battery, solar LED street lamps will not be able to absorb the converted electrical energy. Solar LED street lamps are usually powered by batteries, and the batteries have some characteristics. It is worth considering:
1, the battery only has several specifications of voltage, 12V is the most common use, 24V needs to use two series, 36V is less common. For this reason, a boost type constant current driving module is often required in a solar LED street lamp, which affects the efficiency of the constant current module;
2. Another problem to be considered in solar LED street lamps is the change of input voltage. For the output power and efficiency of the constant current source, to obtain the highest efficiency, the ratio of input and output voltage should be kept as close as possible. But if the input voltage is unstable. Then it is difficult to maintain the best state of maximum efficiency.
Solar LED street lighting systems usually use batteries as energy storage units, and the voltage of the battery will change greatly when it is fully charged and discharged quickly. Usually this change exceeds 30 or more. For example, for a 12V battery, the output voltage can vary from 14.8V to 10.8V. Of course, for constant current modules, such changes are completely affordable. That is to say, it is possible to keep its output current constant over such a large range of variation. But this also comes at a price, that is, it can't work at its best. The best state refers to the state with the highest efficiency or the state with the highest output power.
For constant current modules, whether it is boost or buck, the efficiency is highest only when the output voltage is closest to the input voltage. Usually the output voltage is determined by the load and is rarely changed. So when the input voltage changes within a range, its efficiency also changes. In order to ensure that you can work in the worst case, you can't work at the best! Voltage access has recently been achieved to achieve optimum utilization, and the voltage must be controlled within a certain range to ensure the stability of its use.