UPS Battery Charging and Discharging Knowledge

I. About Charging

1. When UPS is floating charging, please charge it with constant voltage or current below 0.002CA at a charge voltage of 2.275V/cell (set at 20 C). When the temperature is below 0C or above 40C, it is necessary to modify the charging voltage. With 20C as the starting point, the single cell voltage changes – 3MV with each change of one degree.
2. When cycling charging, the charging voltage is 2.40-2.50V/cell (the setting value at 20 C), and the charging voltage is constant. When charging at temperatures below 5C or above 35 C, starting at 20 C, the charging voltage is adjusted to -4mv/cell for each change.
3. The initial charge current is controlled below 0.25CA.
4. Charging capacity is set to 100-120% of discharge capacity, but when the ambient temperature is below 5C, it is set to 120-130%.
5. The lower the temperature (below 5C) is, the longer the charging end time is, the higher the temperature (above 35C) is, the more likely it is to be overcharged. Therefore, it is better to charge within 5C-30C, especially in cyclic use.
6. In order to prevent overcharging, install charging timer as far as possible, or automatically convert to Trickle-flow charging mode.
7. When charging, the temperature of the battery should be controlled in the range of – 15C to + 40C.
   II. ON DISCHARGE
   When discharging, the temperature of the battery should be controlled in the range of – 15 -+50%.
   Continuous discharge current should be controlled below 3CA (H below 6CA).
   The discharge termination voltage varies with the magnitude of the current, as described below. Note that when amplifying, the voltage should not be lower than the following voltage.
   Please charge quickly after discharging. If discharged carelessly, please charge immediately.
   III. Installation Notes
   When installing batteries, the following must be observed:
8. Do not install batteries near the sealed space or fire, otherwise there is a risk of explosion and fire. UPS
9. Don’t cover the battery with ethylene film which may cause static electricity. Sometimes it will cause explosion when static electricity is generated.
10. Do not install batteries in places where water is likely to enter. Otherwise, there is a risk of electric shock and fire.
11. Do not install batteries in the environment of – 40 C~60 C.
12. Do not use batteries where there is dust, otherwise it may cause short circuit of batteries.
13. When putting the battery into the box, we should pay attention to the air circulation.
14. Do not press the upper cover with sticky or labeled objects. Because there is an exhaust valve under the upper cover, the gas generated in the battery will not escape.
15. When the number of parallel connection is floating charging, the plug-in terminal batteries can only be connected with three rows. There is no special restriction on bolted terminals, but the number of connection is small and the reliability increases. In addition, in parallel connection, it is necessary to consider making the connection conductor and contact resistance equal between the columns. In order to keep the charge and discharge batteries in balance, the actual use should not exceed three columns.
16. When using batteries with different capacities, new and old, and manufacturers with different batteries, it is possible to damage batteries and machines because of their different characteristics, so please avoid using them.
    IV. On custody
17. When keeping, please note that the temperature should not exceed – 20 ~40 ~C.
18. Batteries must be kept in full charge when they are in storage. Since some capacity will be lost due to self-discharge during transportation or storage period, please make up the power supply when using.
19. For long-term storage, in order to compensate for self-discharge during storage, please make a supplementary call. Storage over 40C has a bad effect on battery life, please avoid!
20. Keep in a dry, low temperature and well ventilated place.
21. If the battery packaging is improperly wetted by water during storage or transfer, the packaging carton should be removed immediately to avoid the water-wetted carton becoming a conductor and causing battery discharges or burning positive extremities.
    V. Daily Inspection and Maintenance UPS
22. Check batteries regularly. If dust and other external contamination are found, please clean the batteries with water or cloth soaked in warm water. Do not use gasoline, banana water and other organic solvents or oils for cleaning, in addition, please avoid the use of chemical fiber cloth.
23. When the total voltage or the indicator value of the voltmeter on the indicator panel deviates from the benchmark value shown in the table below (+0.05V/cell) during floating charging, the reasons should be investigated and handled.