Four factors that affect battery life and stability of UPS system

Battery failure will reduce the reliability of the system, according to relevant surveys, 70% of UPS failures from the battery. Batteries produced by different manufacturers have different technologies and different life spans. However, the main reasons for affecting the life and stability of the battery are the following four factors:

Temperature has a great influence on the natural aging process of batteries. Detailed experimental data show that for every 5 degrees Celsius increase in temperature, battery life decreases by 10%, so the design of the UPS should keep the battery temperature as low as possible. All online and backup/online hybrid UPS operate with more heat than backup or online interactive UPS (so the former need to install a fan), which is an important reason for the relatively long battery replacement cycle of backup or online interactive UPS.

The battery charger is a very important part of the UPS, and the charging conditions of the battery have a great impact on the battery life. UPS battery life can be maximized if the battery has been in a constant voltage or "float charge" battery charging state. In fact, the battery life of the charging state is much longer than that of the pure storage state. Because battery charging can delay the natural aging process of the battery, the UPS should keep the battery charged regardless of operation or shutdown.

UPS whether running or shutdown state battery is in the charging state, many UPS on the market do not have this function. Although this function increases the cost of the UPS, if the cost of replacing the battery is taken into account, the total cost of using the UPS is reduced.

The battery is composed of a single "primary battery", each of which has a voltage of about 2 volts, and the primary battery is connected in series to form a battery with a higher voltage, a 12-volt battery is composed of 6 primary batteries, and a 24-volt battery is composed of 12 primary batteries. When the UPS battery is charged, each primary battery connected in series is charged. The slightly different performance of the galvanic cells will lead to the charging voltage of some galvanic cells is higher than that of other galvanic cells, and this part of the battery will age in advance. As long as the performance of one of the primary cells connected in series decreases, the performance of the entire battery will also decrease. The test proves that the battery life is related to the number of primary cells in series, and the higher the battery voltage, the faster the aging.