6 Ways to teach you to "live" ups batteries

UPS, the uninterrupted power supply, is a system that connects the battery(mostly lead-acid maintenance-free battery) with the host and converts DC into market power through modular circuits such as host inverters. It is mainly used to provide stable and uninterrupted power supply to a single computer, computer network system or other power electronic equipment such as an electromagnetic valve, pressure transmitter, etc.. How long is the battery life of ups?

1. Periodic Inspection

Check the end voltage and internal resistance of each unit battery regularly. For 12V cell batteries, if the end voltage difference between the cell cells is found to exceed 0.4 V or the internal resistance of the cell exceeds 80mΩ, the cell cells should be evenly charged. To restore the internal resistance of the battery and eliminate the end voltage imbalance between the cells. When charging evenly, the charging voltage can be taken from 13.5 to 13.8 V. Most batteries with well-balanced charging can restore their internal resistance to below 30mΩ. During the operation of the UPS power supply, due to the above-mentioned imbalance of the cell characteristics of each unit over time, it is impossible to rely on the charging loop inside the UPS power supply to eliminate it, so there has been a significant imbalance in this characteristic. Battery, If you do not take off-line processing in time, its imbalance will become more and more serious.

2. Refloat

The UPS power supply is shut down for more than 10 days. Before rebooting, the UPS power supply should be started without load to use the charging loop in the machine to reload the battery with a load of more than 10 to 12 H. The UPS power supply is in a floating state for a long time without a discharge process, which is equivalent to being in a "storage for use" state. If this state lasts too long, the battery will fail due to "Over storage". It is mainly manifested as an increase in the internal resistance of the battery, and in severe cases, the internal resistance can reach several times. We found that after 1 month of storage at room temperature at 20 °C, the battery's available capacity is about 97 % of its rating, and if it is not stored for 6 months, its usable capacity becomes 80 % of its rated capacity. If the storage temperature rises, its usable capacity will also decrease. Therefore, it is recommended that the user preferably deliberately unplug the market input every 20 °C months, so that the UPS power supply works in the state where the battery provides energy to the inverter. However, this operation should not be too long. When the load is about 30 % of the rated output, about 10 minutes can be discharged.

3. Reduce deep discharge

Its service life is closely related to the depth at which it is discharged. The lighter the load on the UPS power supply, the greater the ratio of its available capacity to its rated capacity when the power supply is interrupted. In this case, When the UPS power supply is automatically turned off due to low battery voltage, the depth of discharge of the battery is deeper. How does the actual process reduce the deep discharge of the battery? The method is very simple: When the UPS power supply is interrupted by the market power supply and the battery is used to supply the inverter, most of the UPS power supplies will use a periodic alarm sound that rings around 4S in the gap to inform the user that the battery is now providing energy. When the alarm sound becomes rapid, it means that the power supply is in deep discharge and emergency treatment should be carried out immediately to turn off the UPS power supply. Not to be forced, generally do not let the UPS power supply work until the battery voltage is too low and automatically shut down before the end.

4. Charge with peak power supply

For users whose UPS power supply has long been at low voltage or frequent power outages, in order to prevent the battery from being damaged prematurely due to long-term insufficient charging, The battery should be recharged at peak times(e.g. late at night) to ensure that the battery has sufficient recharging time after each discharge. After the general battery is deeply discharged, recharging to 90 % of the rated capacity requires at least 10 to 12 H.

5. Pay attention to the choice of charger

UPS maintenance-free sealed batteries cannot be charged with a Silicon controlled "fast charger". This is because the charger will cause the battery to be in a bad state of charging both "instantaneous overcharge" and "instantaneous overcharge." This state will greatly reduce the battery availability capacity, and in serious cases will cause the battery to be scrapped. When using the UPS power supply of the constant voltage cut-off charging loop, be careful not to lower the battery voltage too low, otherwise, it is easy to generate over current charging at the beginning of its charging. Of course, it is best to use a charger with constant current and constant pressure to charge it.

6. Ensure the ambient temperature of the power supply

The available capacity of the battery is closely related to ambient temperature. Under normal circumstances, the performance parameters of the battery are calibrated at room temperature of 20 °C. When the temperature is lower than 20 °C, the available capacity of the battery will be reduced, and the temperature is higher than 20 °C. Its available capacity will increase slightly. Different types of batteries in different manufacturers are affected by temperature to different degrees. According to statistics, at -20 °C, the available capacity of the battery can only reach about 60 % of the nominal capacity. The influence of temperature cannot be ignored. Of course, not only should the service life of the battery pack be maintained and used, but the load characteristics(resistivity, inductance, capacitance) and size should be fully considered in the selection. Do not keep the battery running too lightly for a long time, so that the battery discharge current is too small and the battery is scrapped.

The above are the six ways to "renew" the battery life of ups. I hope you can learn from the correct use and daily maintenance of UPS. You have more knowledge about UPS. Please continue to pay attention.

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