Technique of Estimating the Amount of Batteries in Uninterruptible Power Supply Systems

Uninterruptible power supply devices are widely used in protection facilities. It is necessary to ensure stable operation without power supply during design or redevelopment of the system. At the same time, there is no generally accepted algorithm for calculating battery parameters that are optimal in terms of the ratio of cost and discharge time. This problem is usually solved by using additional batteries, which increases the cost of the system. We suggest using the results of battery tests to optimize their amount in an uninterruptible power supply device. A test bench has been developed that allows you to adjust the load current. Three 12V rechargeable batteries with a Capacity of 12, 17 and 26 Ah were tested. The results showed that when the load current is increased by 20% and 30%, the battery life with Capacity 12 Ah is reduced by 50%. Batteries with a Capacity of 17 Ah and 26 Ah are reduced by 20% and 10%, respectively. It is concluded that when using batteries with a Capacity of 17 and 26 Ah, it is possible to increase the load current. The results obtained make it possible to more accurately calculate the required battery capacity for an uninterruptible power supply device and optimize their amount.