What are the characteristics of UPS battery packs in series and parallel

In the parallel circuit of UPS batteries, the total voltage is equal to the voltage of each branch. In other words, the charging voltage applied to each of the two groups of batteries connected in parallel is equal to the total charging voltage, that is, U total u003d U1 u003d U2. According to the formula of Iu003dU/R, after calculation, it can be known that I1≠I2 (because the internal resistance of the two sets of batteries will definitely not be the same, that is, R1≠R2, in the case of U1u003dU2, I1 ≠I2 result). That is to say, in the case of the same charging voltage, the charging current obtained by each of the two groups of battery packs used in parallel is not the same. The charging current is small if the internal resistance is large, and the charging current is small if the internal resistance is small. The current is large. In this way, it is possible that the group of UPS batteries with low charging current are often under-charged. Over time, this group of batteries may be sulphated due to long-term power loss and increase its internal resistance. The greater the internal resistance, the charging current Smaller, due to such a vicious circle, the service life of this battery is greatly shortened. Therefore, the author suggests that users should never use two sets of batteries in parallel when they can use a set of UPS batteries to meet the requirements of the equipment, otherwise it will shorten the life of the UPS batteries, increase the cost of use, and reduce the battery’s cost. Comprehensive performance, should not do this kind of wasteful things. The important purpose of UPS is to continuously maintain power supply in the event of a mains or bypass power failure, but nowadays, most UPSs have too many links in series, which is precisely the link with the weakest availability. Generally, the battery specification will state that the charging current should not exceed 0.15CC, which means that it will take several times for the battery to overflow after the uninterruptible power supply UPS is discharged at full load. Parallel UPS battery packs may be beneficial under certain circumstances, but the majority of them are disadvantages. The two sets of batteries connected to the same mains system are in parallel, and the voltage between them should be equal to the total mains voltage. In this case, due to differences in various processes, it is inevitable that the internal resistance of the battery will be caused. The value will be slightly different, so that when the same voltage is passed, the current at both ends will be different. After a long time, the battery with a small current will undergo internal evolution for a long time, which will further increase its internal resistance. The shortcomings of the two sets of batteries connected in parallel are undoubtedly revealed. There are not so many benefits related to using only one set of batteries. This will waste additional battery usage costs, but will shorten the service life of the UPS battery and reduce the overall performance of the battery. From the perspective of reliability, if the mains power is suddenly interrupted, but only when there are two sets of batteries connected in parallel, at this time, an extra set of batteries will provide an extra layer of protection, allowing the equipment to operate normally. You should also pay attention to the selection of two sets of UPS batteries in parallel. The specifications and models of the two sets of batteries to be connected in parallel must be the same. Whether it is new or old and whether the batch number is the same batch is also considered. In general, there is not much advantage in parallel UPS battery packs. According to the requirements of your own equipment, choosing a suitable large-capacity UPS battery will bring a lot of convenience to the later stage. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the critical processes for lithium battery pack processing?