Even if the UPS uses the same battery technology, the battery life of different manufacturers is very different, which is very important for the user, because the cost of replacing the battery is very high (30% of the UPS price). A battery failure can reduce the reliability of the system and is very annoying. Battery temperature affects battery reliability Temperature has a large effect on the natural aging process of the battery. Detailed experimental data shows that for every 5 degrees Celsius rise in temperature, battery life drops by 10%, so the UPS should be designed to keep the battery as cold as possible. All online and backup/online hybrid UPSs generate more heat than backup or online interactive UPS (so the former installs a fan), which is also an important part of the backup or online interactive UPS battery replacement cycle. the reason. The temperature of the APC UPS battery is minimized, so it can better meet system reliability requirements. Battery charger design affects battery reliability Battery chargers are a very important part of UPS, and battery charging conditions have a major impact on battery life. If the battery is always in a constant voltage or "floating" battery state, the UPS battery life can be maximized. In fact, the life of the battery state of charge is much longer than the life of the simple storage state. Because battery charging can delay the natural aging process of the battery, the UPS should keep the battery charged regardless of whether it is running or stopped. All APC UPSs are in a state of charge regardless of whether they are running or stopped. Many UPSs on the market do not have this feature. Although this feature increases the cost of the UPS, the total cost of using the UPS is reduced if the cost of replacing the battery is taken into account. Battery voltage affects battery reliability The battery is composed of a single "primary battery". Each primary battery voltage is about 2 volts. The primary battery is connected in series to form a higher voltage battery. A 12 volt battery consists of 6 primary batteries, and the 24 volt battery consists of 12 batteries. A primary battery composition and so on. When the UPS's battery is charged, each of the connected primary batteries is charged. A slightly different primary battery performance will result in some primary battery charging voltages higher than other primary batteries, and some of these batteries will age prematurely. As long as the performance of one of the galvanic cells connected in series is degraded, the performance of the entire battery will also decrease. Tests have shown that battery life is related to the number of primary batteries connected in series. The higher the battery voltage, the faster the aging. When the UPS capacity is constant, the battery voltage should be designed as low as possible, so that the UPS battery life is longer. When the battery voltage is constant, the number of batteries with low voltage plateau batteries should be selected. Do not select the number of low-voltage primary batteries in series. Battery. Some manufacturers have higher battery voltages for UPS. This is because the higher the voltage, the lower the current, and the thinner wires and semiconductors with lower power can be used to reduce the cost of the UPS. The battery voltage of a UPS with a capacity of about 1KVA is generally 24 to 96V. This capacity grade APC UPS, such as the Smart-UPS 1250 battery voltage, has a minimum of 24V. The lower battery voltage of APC UPS relatively extends battery life. APC UPS battery life is 3 to 5 years, while some UPS batteries have a typical life of only 1 year! In the ten years of UPS, the cost of replacing the battery is better than the UPS itself. The price is twice as high! Although these UPS designs are easier and less expensive, the "potential" replacement battery is costly. Battery ripple current affects battery reliability Ideally, in order to extend the life of the UPS battery, the battery should always be kept in a "floating" or constant voltage state. A fully charged battery in this state will absorb very little charger current, which is called a "floating" or "self-discharging" current. Despite the battery manufacturer's recommendation, some UPS designs (many in-line) expose the battery to some extra small current called ripple current. The ripple current is generated when the battery is continuously powered to the inverter, because according to the principle of energy conservation, the inverter must have input DC power to generate an AC output. In this way, the battery forms a small charge and discharge cycle, and the frequency of the charge and discharge current is twice the UPS output frequency (50 or 60 Hz). Ordinary backup, APC online interactive or backup / ferromagnetic UPS will not have ripple current, other designs of UPS will produce ripple current of different sizes, depending on the specific design method. Just check the structure diagram of the UPS to see if the UPS can generate ripple current. If the battery of the online UPS is between the charger and the inverter, then the battery will have ripple current, which is a common "double conversion" UPS. If the battery is isolated from the inverter with a cut-off diode, relay, converter or rectifier, the battery will not have ripple current. Of course, UPSs of this design are not always "online", so this type of UPS is called a "mixed backup/online" UPS. to sum up The battery is the most unreliable part of the UPS system, but the design of the UPS directly affects the reliability of the battery. Keeping the battery charged (even if the UPS is down) can extend the battery life and avoid using a UPS with a high battery voltage. Some UPS designs can cause ripple current in the battery, causing unnecessary overheating of the battery. Most UPSs use similar batteries, but different UPS designs can significantly affect battery life. Stainless Steel Pressing,Stamp Steel Part,Stamp Part Huari Metal Products Co., Ltd. , http://www.mentalproducts.com