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Four Maintenance Methods for UPS Battery
- Apr 24, 2018 -

Many people think that the battery does not require maintenance, especially when using UPS power supply, this idea is even more obvious. However, in reality, the problems caused by the lack of maintenance of the battery are quite high in the total fault share of the UPS. Therefore, the routine maintenance of the UPS battery will greatly extend the UPS battery life and reduce the failure rate. This article will introduce the UPS battery maintenance method.

Maintain a suitable ambient temperature

In general, the factor that affects the battery life is ambient temperature. The optimal ambient temperature required by a typical battery manufacturer is between 20-25°C. Although the increase in the temperature of the battery discharge capacity has improved, but the price paid is the battery life is greatly reduced. According to the test, once the ambient temperature exceeds 25°C, the battery life is shortened by half for every 10°C increase. At present, the batteries used by UPS are generally maintenance-free sealed lead-acid batteries, and the design life is generally 5 years, which can be achieved under the environment demanded by battery manufacturers. Failure to meet the required environmental requirements will have a significant difference in the length of their lives. In addition, the increase in ambient temperature will lead to an increase in the internal chemical activity of the battery, resulting in a large amount of heat, which in turn will cause the ambient temperature to rise. This vicious cycle will accelerate the shortening of the battery life.

Charge and discharge regularly

The float charge voltage and discharge voltage in the UPS power supply are all adjusted to the rated value at the time of delivery, and the discharge current is increased with the increase of the load. During use, the load should be properly adjusted, such as controlling the microcomputer and other electronic devices. The number of uses. Under normal circumstances, the load should not exceed 60% of the rated load of the UPS. In this range, the discharge current of the battery will not be excessively discharged.

Because UPS is connected to mains for a long time, in the use environment where the power supply quality is high and there is little power outage, the storage battery will be in a state of floating charge for a long time. As time passes by, the activity of the conversion of battery chemical energy and electric energy will decrease, and the aging will be accelerated. And shorten the service life. Therefore, it should be discharged once every 2-3 months. The discharge time can be determined according to the capacity of the battery and the size of the load. After a full-load discharge is complete, recharge for more than 8 hours as required.

Use communication functions

At present, most large and medium sized UPSs have operability such as microcomputer communication and program control. The corresponding software is installed on the microcomputer, the UPS is connected through the serial/parallel port, and the program can be used to communicate with the UPS using the microcomputer. Generally have information query, parameter settings, timing settings, automatic shutdown and alarm functions. 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 the UPS, battery life and Battery out of alarm. Through these intelligent operations, it greatly facilitates the use and management of UPS power supplies and their batteries.

Timely replacement of waste/bad batteries

At present, the number of batteries used in large and medium-sized UPS power supplies ranges from 3 to 80 or even more. These individual batteries constitute a battery pack through circuit connections to meet the DC power supply requirements of the UPS. In the continuous operation and use of the UPS, due to differences in performance and quality, it is unavoidable that the performance of individual batteries will be degraded and the storage capacity will not meet the requirements. When one or some of the batteries in the battery pack are damaged, maintenance personnel should perform an inspection test on each battery to eliminate the damaged battery. When replacing a new battery, you should try to buy the same type of battery with the same manufacturer, and prohibit the mixed use of acid-proof battery, sealed battery, and batteries of different specifications.

This article gives four ways to extend the working life of the UPS battery. In summary, it can be summarized as four sentences: proper temperature, regular charging and discharging, making good use of communication functions, and timely replacement of damaged batteries. In the study of the power supply, there is no university or elementary school. As long as one observes the observation, various characteristics and methods can be summarized to facilitate our design.