We all know the 'brain' of
solar street light, the important role of solar controller. So, if solar street light wants to work stably, it is not enough to rely on a powerful brain. Today, what we are going to talk about is the output component that really stabilizes electric energy - the battery. Why is it necessary to configure batteries for power generation with solar panels? This is because photovoltaic power generation systems are not as stable as we think. In order to prevent the load loss caused by the instability of the input energy, the configuration of the battery is very necessary. Common solar street light batteries include sealed lead-acid batteries, ordinary lead-acid batteries, gel batteries, lithium-iron batteries and alkaline nickel-cadmium batteries, etc. The voltage is generally 12V or 24V. The development and application of lithium batteries also provide many possibilities for reducing the configuration space of components. Since the battery is so important, is the larger the capacity the better? To understand this we have to review its workflow. The first thing the battery has to do is to provide electrical energy to the load equipment at night and in rainy days, and on the other hand, it is to store the energy generated by the battery panel during the day. If the capacity is large, the battery discharge process will take longer than the charging process, resulting in a constant state of power loss. Of course, too much capacity also creates a lot of waste. Based on this, the battery capacity must be matched to the actual load. Generally speaking, the general power is 4 times to 6 times higher than the load, and the battery voltage is less than 20% to 30% of the solar panel. With the advancement of technology, the type and performance of batteries have been greatly improved. The solar street light battery generally has the characteristics of many cycles of charge and discharge, low self-discharge rate, long service life, strong deep discharge capability, and high charging efficiency, and can basically be maintained with little or no maintenance. With a powerful battery as an energy supply, another role of solar street light is about to play, that is, the light source. We will discuss the solar street light with you in the next issue.
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