Many people think that the battery does not need mainte […]
Many people think that the battery does not need maintenance, especially when using UPS power supply, this idea is more obvious. But in fact, the problems caused by the lack of maintenance of batteries account for a high proportion of all UPS failures. Therefore, routine maintenance of UPS batteries will greatly extend the life of UPS batteries and reduce the failure rate. This article will introduce how to maintain UPS batteries.
Maintain a suitable ambient temperature
Generally speaking, the major factor affecting battery life is the ambient temperature. The best ambient temperature required by general battery manufacturers is between 20-25°C. Although the increase in temperature improves the discharge capacity of the battery, the price paid is that the life of the battery is greatly shortened. According to tests, once the ambient temperature exceeds 25°C, the battery life will be shortened by half for every 10°C increase. At present, the batteries used in UPS are generally maintenance-free sealed lead-acid batteries with a design life of 5 years, which can only be achieved under the environment required by the battery manufacturer. If the specified environmental requirements are not met, the life span will vary greatly. In addition, the increase of the ambient temperature will lead to the enhancement of the chemical activity inside the battery, thereby generating a large amount of heat energy, which in turn will increase the ambient temperature. This vicious circle will accelerate the shortening of the battery life.
Charge and discharge regularly
The float voltage and discharge voltage in the UPS power supply have been adjusted to the rated value at the factory, and the discharge current increases with the increase of the load. The load should be adjusted reasonably during use, such as controlling electronic equipment such as microcomputers. The number of units used. Under normal circumstances, the load should not exceed 60% of the UPS rated load. Within this range, the battery discharge current will not be over-discharged.
Because UPS is connected to the mains for a long time, in an environment with high power supply quality and few mains blackouts, the battery will be in a floating state for a long time, which will lead to a decrease in the activity of the battery's chemical energy and electrical energy conversion and accelerate aging And shorten the service life. Therefore, it should be completely discharged every 2-3 months, and the discharge time can be determined according to the capacity and load of the battery. After a full-load discharge is completed, charge it for more than 8 hours as required.
Use the communication function
At present, the vast majority of large and medium UPSs have operational capabilities such as communication with microcomputers and program control. Install the corresponding software on the microcomputer, connect the UPS through the serial/parallel port, and run the program, then the microcomputer can be used to communicate with the UPS. Generally, it has functions such as information query, parameter setting, timing setting, automatic shutdown and alarm. Through information query, you can obtain information such as mains input voltage, UPS output voltage, load utilization, battery capacity utilization, internal temperature and mains frequency; through parameter settings, you can set the basic characteristics of UPS, battery life and The battery runs out warning, etc. Through these intelligent operations, it greatly facilitates the use and management of the UPS power supply and its storage battery.
Replace used/bad batteries in time
At present, the number of batteries equipped with large and medium-sized UPS power supplies ranges from 3 to 80, or even more. These single batteries form a battery pack through circuit connection to meet the needs of UPS DC power supply. In the continuous operation and use of UPS, due to the difference in performance and quality, it is inevitable that individual batteries will be damaged due to performance degradation and insufficient power storage capacity. When one/some batteries in the battery pack are damaged, the maintenance personnel should inspect and test each battery to exclude the damaged battery. When replacing a new battery, you should try to buy the same type of battery from the same manufacturer. It is forbidden to mix acid-proof batteries, sealed batteries, and batteries of different specifications.
This article gives four methods to extend the working life of UPS batteries. In general, they can be summarized in four sentences: proper temperature, regular charging and discharging, good use of communication functions, and timely replacement of damaged batteries. In the study of power supply, there are no university or elementary school questions. As long as you pay attention to observation, you can summarize various characteristics and methods to facilitate our design.
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