How to choose the battery capacity?

With the development of Internet big data, more and more UPS devices are used in communication computer rooms, and storage batteries are used as backup energy for UPS devices. The capacity configuration determines the backup time of the system, which directly affects the safe, reliable and stable operation of electrical equipment. The battery capacity of the UPS power supply is expressed in ampere hours (AH). For example, 24AH means that when the discharge current is 24 amperes, it can continue to discharge for 1 hour; or when the discharge current is 1 ampere, it can continue to discharge for 24 hours. Usually, the UPS battery capacity is expressed by voltage and ampere-hours, such as 12V/24AH, 12V/7AH, etc. The UPS power battery with the same voltage has a large capacity with a large ampere-hour; the battery with the same ampere-hour has a large capacity with a high voltage. For example, the power of a certain electrical equipment is 150W, and the required discharge time is 0.5 hours, please select the 12V battery capacity. Then the battery capacityu003d150u0026pide;12×0.5u0026pide;0.7u003d8.9AH, and the battery of about 12V/9AH can be used. 0.7 means that the design should be calculated at 70% discharge, otherwise it will affect the service life of the UPS battery. In the small-capacity UPS power supply, in addition to the limited battery capacity of about 30 minutes, users often need to equip an external battery to extend the backup time. Generally, there is no standard battery in the large-capacity UPS, but according to the requirements at the time. Outside distribution. In these situations, the UPS battery capacity must be selected, but generally speaking, the correct battery capacity cannot be obtained by calculation alone. UPS battery capacity is an important parameter to evaluate the performance of the battery, and it is also the basis for the length of time the battery works under a fixed load; it is also the charging standard for the so-called complete discharge of the battery under this condition. The capacity of the UPS battery is measured when the ambient temperature is 25 degrees Celsius. When the ambient temperature is different, the discharge capacity of the battery (the chemical reaction efficiency of the active material in the battery) will be different. Generally speaking, in the temperature range below 40 degrees Celsius, the lower the temperature, the smaller the capacity of the battery; in the temperature range greater than 40 degrees Celsius, the battery’s discharge capacity will have a peak value. When the temperature is higher than the peak value, the battery’s discharge capacity will have a peak. The discharge capacity also tends to decrease. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Analysis of common problems and handling methods of nickel-metal hydride batteries