Proper use and maintenance of batteries:
1. Maintain a suitable ambient temperature
A key factor affecting battery life is ambient temperature, with battery manufacturers generally recommending an optimal range of 20°C-25°C. While higher temperatures can improve battery discharge capacity, the trade-off is a significantly shortened battery life. Tests have shown that for every 10°C increase above 25°C, battery life is halved. Currently, UPS systems typically use maintenance-free, sealed lead-acid batteries with a design life of approximately 5 years, achievable only under the manufacturer's specified environmental conditions. Failure to meet these requirements results in substantial variations in battery life. Furthermore, increased ambient temperature leads to enhanced chemical activity within the battery, generating significant heat, which in turn raises the surrounding temperature, creating a vicious cycle that further accelerates battery life reduction.
2. Regularly charge and discharge.
The float charge voltage and discharge voltage of a UPS power supply are pre-calibrated to their rated values at the factory. However, the discharge current increases with the load. Therefore, the load should be adjusted appropriately during use, such as controlling the number of electronic devices like microcomputers in operation. Generally, the load should not exceed 60% of the UPS's rated load. Within this range, the battery discharge current will not be excessively discharged.
Because UPS systems are constantly connected to the mains power supply, in environments with high power quality and infrequent mains power outages, the batteries will remain in a float charge state for extended periods. Over time, this reduces the activity of the battery's chemical energy to electrical energy conversion, accelerating aging and shortening its lifespan. Therefore, UPS systems should generally be fully discharged every 2-3 months. The discharge time can be determined based on the battery capacity and load. After a full load discharge, the battery should be recharged for at least 8 hours as specified.
3. Utilize communication functions
Currently, the vast majority of large and medium-sized UPS systems possess the operational capabilities of communicating with a microcomputer and program control. By installing the corresponding software on a microcomputer, connecting the UPS via a serial/parallel port, and running the program, communication between the microcomputer and the UPS can be achieved. Generally, functions include information query, parameter setting, timer settings, automatic shutdown, and alarms. Information queries can obtain data such as mains input voltage, UPS output voltage, load utilization, battery capacity utilization, internal temperature, and mains frequency. Parameter settings allow configuration of basic UPS characteristics, battery lifespan, and battery depletion alarms. These intelligent operations greatly facilitate the use and management of the UPS power supply and its batteries.
4. Replace used/damaged batteries promptly.
Currently, large and medium-sized UPS power supplies are equipped with anywhere from 3 to 80 batteries, or even more. These individual batteries are connected by circuits to form a battery pack to meet the DC power supply requirements of the UPS. During continuous operation of the UPS, due to differences in performance and quality, it is inevitable that some batteries will experience performance degradation or fail to meet storage capacity requirements, leading to damage. When one or more batteries in the battery pack fail, maintenance personnel should inspect and test each battery to eliminate the damaged one. When replacing batteries, efforts should be made to purchase batteries of the same manufacturer and model; mixing acid-resistant batteries and sealed batteries, or batteries of different specifications, is strictly prohibited.
