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Author ：Iflowpower – Portable Power Station Supplier
Through the statistics of various faults in the UPS repair work, this conclusion can be drawn: the rear-pre-collected UPS power supply, the fault caused by the battery exceeds 50% of the total fault. Online UPS power supply, because its circuit design is reasonable, the balance taken by the drive power component capacity, so the power supply circuit is very low, compared to the failure rate caused by the battery pack to over 60% or more. It can be seen that correctly use and maintain the battery is one of the key factors that extend battery pack life and reduce the total failure rate of UPS power supply.
1. Regular inspection periodically check the end voltage and internal resistance of each unit battery. For a 12V unit battery, if the end voltage between each unit battery is found in the inspection, the cell battery should be balanced to restore the internal resistance of the battery by more than 0.
4 V or more than 80mΩ or more. And eliminate end voltage between each unit cell. The charging voltage takes 13.
5 ~ 13.8V when charging. Most batteries that have a good balance charging process can restore their internal resistance to 30MΩ.
During operation, the UPS power supply is eliminated due to the above-described imbalance of each unit battery characteristics, which is impossible to rely on the charging circuit inside the UPS power supply, so that this characteristic has a significantly unbearable battery. Group, if the offline is not charged in time, its unevenness will become more and more serious. 2.
Re-floating the UPS power stop for more than 10 days. Before rebooting, the UPS power supply should be started under the conditions that are not loaded to re-use the charging loop in the machine to float the battery 10 to 12h or more. The UPS power supply is in a floating state without the discharge process, which is equivalent to the state of "storage.
". If this state is too long, the battery has not been scrapped due to "long-term storage", which is mainly manifested as the increase in battery internal resistance, and the internal resistance can reach a few Ω. We found that after 2 months of room temperature, the battery can be used for about 97% of its rated value.
If the storage is 6 months, its use capacity becomes 80% of the rated capacity. If the storage temperature rises, its use capacity will decrease. It is therefore recommended that the user is best to unplug the mains input every 20 ° C, so that the UPS power supply is operated by the battery to provide energy to the inverter.
However, this operation should not be too long, and about 30% of the load is about 30% of the rated output, it can be discharged. 3. Reduce the service life of deep discharge electricity is closely related to the depth of it being discharged.
The lighter the load of the UPS power supply, the larger the amount of capacity of the electric storage and its rated capacity, the ratio of the ratio of the power storage is, in which case the battery is automatically shut down when the battery voltage is too low due to the low battery voltage The depth of discharge is relatively deep. How does the actual process reduce the battery that the battery is depressed? The method is very simple: When the UPS power supply is in the mainstream interruption, changed from the battery to the inverter, most of the UPS power supplies will ring the cyclical alarm sound in the gap 4S, notifying the user that now is by battery. When he heard the alarm sound is urgent, the power supply is already in depth, and should immediately perform emergency treatment, close the UPS power supply.
Not forced, generally don't let the UPS power have been working until the battery voltage is too low and the automatic shutdown ends. 4. Using the high peak charging of the power supply to the UPS power supply for a long time in the market, low-voltage power supply or frequently-stopped power, to prevent the battery from being damaged by the long-term charging, it should be fully utilized to charge the battery to the battery.
Ensure that the battery has sufficient charging time after each discharge. Generally, after the battery is discharged, it is charged to 90% of the rated capacity to at least 10 to 12 h. 5, pay attention to the selection of the charger to use the UPS power supply-free seal battery that cannot be charged with a controlled silicon-type "fast charger".
This is because this charger will cause the battery to be in the harsh charging state of "instantaneous overflow charging" and "instantaneous transient charging. This state will make the battery greatly decreased, and the battery will be scrapped when it is severe. When using the UPS power supply of the constant voltage cut-off charging circuit, be careful not to adjust the battery voltage too low protection work points, otherwise, it is prone to overflow charging in its initial charging.
Of course, it is best to use a charger that has both constant current, and constant pressure. 6. Ensure that the capacity of the power supply temperature battery is closely related to the ambient temperature.
In general, the performance parameters of the battery are calibrated at room temperature for 20 ° C, and when the temperature is less than 20 ° C, the power storage capacity will be reduced, while the temperature is higher than 20 ° C, it is available The capacity used will increase slightly. Different models of different models of different models are different from the degree of temperature. According to statistics, when at -20 ° C, the battery can only reach around 60% of the nominal capacity.
The impact of visible temperature cannot be ignored. Of course, to extend the service life of the battery pack not only pay attention to maintenance, but also consider load characteristics (resistivity, inductance, capacitance) and size when selecting. Don't make the battery in overload operation for a long time, so as not to avoid the battery discharge.
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