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How to extend the lifespan of solar streetlight batteries?
Category: Company News
May 29,2022
First, avoid overcharging. The lifespan and performance of solar streetlight batteries are closely related to the heat accumulation occurring inside the battery. The primary heat source inside the battery comes from the power loss of internal electrochemical reactions, which can be simply viewed as the product of charging voltage and charging current. In the oxygen recombination reaction, the float charging current increases, generating more heat. During constant voltage charging, the float charging current also increases with rising temperature, further raising the temperature. Thermal runaway is a unique phenomenon caused by the structural method of valve-regulated sealed batteries. Thermal runaway can lead to serious hazards such as battery dehydration and bulging of the casing, and in severe cases, it can render the battery unusable. To avoid overcharging, it is essential to strictly follow the charging voltage values provided in the manufacturer's manual. Current combined power sources can be set up and managed intelligently; it is important to first set them correctly and secondly ensure that unauthorized personnel do not change them arbitrarily.
Second, avoid undercharging. In contrast to overcharging, undercharging is mainly caused by setting the charging voltage too low or excessively low. Alternatively, there may be issues with the rack system.
Third, avoid over-discharging. The depth of discharge is closely related to the design cycle life (service life) of the battery. For example, at a discharge depth of 5%, the cycle count is 10,000 times; when the discharge depth is 50%, the cycle count drops to only 800 times. Severe over-discharging can prevent the battery from being reactivated to its optimal state or even render it unusable. Different discharge rates have different discharge times and cut-off voltages, and the useful capacity released also varies, influenced by environmental temperature. Here, we will not list or draw related curves; different manufacturers provide this information in their battery manuals. Maintenance personnel should pay attention to this and strictly set relevant data in the monitoring unit without arbitrary changes. Currently, rack power manufacturers have designed a battery cut-off function; when the solar streetlight battery discharges to a set cut-off voltage, it automatically disconnects the battery discharge circuit through monitoring commands. Some manufacturers have also considered situations where monitoring units cannot detect cut-off voltage or issue commands due to various reasons (depending on their working power supply) and have installed backup forced cut-off circuits. Therefore, maintenance personnel should also pay attention to the reliability of these hardware circuits during inspections and conduct checks and maintenance.
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