Selection of super capacitors for solar garden lights

Since the input energy of the solar garden light battery is extremely unstable, and the garden light only emits light when the surrounding light is weak, it is necessary to configure a power storage system to work effectively. At this stage, lead-acid batteries, Ni-Cd batteries or Ni-H batteries are generally used, but there are many defects in using batteries as power storage systems: first, rechargeable batteries have limited charging times (less than 1000 times) and short service life; secondly , due to the influence of its chemical structure, it cannot be charged with high current; third, the battery needs to have control circuits such as anti-overcharge, anti-over-discharge and temperature compensation, and the control circuit is relatively complex; fourth, rechargeable batteries are mainly used. The chemical reaction is used to charge and discharge, and the waste in the battery will pollute the environment and is not an environmentally friendly product. Therefore, the super capacitor is used as the energy storage element in this garden light. The capacitor has a super large capacitance of the Farad level, super charge retention ability, and a very small leakage current, and the voltage drop rate is less than 5% in 8 hours; no special charging circuit and control discharge circuit are required, the charging is fast, and it can be charged only in Charged at a state higher than its leakage current (typically about 1mA), so the solar cell can charge the supercapacitor even on cloudy days; compared with the battery, its overcharge and overdischarge do not negatively affect its lifespan Influence, high reliability, long service life (charge and discharge cycle life is more than 100,000 times); in addition, it also has excellent temperature performance, can be used normally in the ambient temperature of -40 ° C ~ 75 ° C; no pollution, is a kind of Green power supply; can be welded, and there is no such problem as loose contact like garden light batteries. Shanghai Changhui Lighting Technology Co., Ltd. produces a complete range of lighting products with high quality and low price. The company is convinced that: integrity is the purpose of the company's operation, reputation is the criterion for company cooperation, technology is the driving force for the company's development, high quality and high efficiency are the entry point for the company's products to enter the market, and adhere to the quality of survival, reputation and development, customer-oriented God's policy, let us work together to develop!