For some daily work, the leader asked to create a table for each unit to analyze the performance of UPS.
1.The external circuit in the UPS input characteristics is used to determine whether the UPS uses multiple power supplies. Determine the power supply source and determine the power supply line.
2. The maximum load power is the nominal maximum load power of UPS, and the actual load power is the actual load power of UPS. Load ratio=actual load power/maximum load power, used to determine whether UPS is operating at the specified ratio.
3. The output voltage is used to determine the supply voltage of the UPS.
4. Single cell parameters – Operating temperature refers to the daily operating temperature of the battery, which has a significant impact on the battery’s endurance.
5. Precautions for using UPS power system
Due to its high level of intelligence, the UPS power system uses maintenance free batteries for energy storage, which brings a lot of convenience to use. However, attention should be paid to multiple aspects during use to ensure safety.
(1) The UPS power supply host does not have high requirements for environmental temperature, and can work normally at+5 ℃~40 ℃. However, it requires indoor cleanliness and less dust, otherwise dust and humidity will cause the host to malfunction. Energy storage batteries have higher temperature requirements, with a standard operating temperature of 25 ℃, and should not exceed+15 ℃~+30 ℃ during normal use. If the temperature is too low, the capacity of the storage battery will decrease. For every 1 ℃ decrease in temperature, its capacity will decrease by 1%. Its discharge capacity increases with temperature, but its lifespan decreases. If used for a long time at high temperatures, the battery life will be reduced by about half for every 10 ℃ increase in temperature.
(2) The parameters set in the host cannot be changed arbitrarily during use. Especially for the parameters of the battery pack, it will directly affect its service life, but with changes in ambient temperature, corresponding adjustments should be made to the float charging voltage. Usually set at 25 ℃, for every 1 ℃ increase or decrease in ambient temperature, the float charge voltage should increase by 18mV (relative to a 12V battery).
(3) When there is no external power supply relying on the UPS power system for self power supply, it is necessary to avoid starting the UPS power supply with a load. Each load should be turned off first, and the load should be turned on after the UPS power system is started. Due to the instantaneous power supply of the load, there will be an impact on the battery. The impact current of multiple loads, combined with the required power supply current, will cause the UPS power supply to overload instantly, and in severe cases, it will damage the converter.
(4) The UPS power system should have a small power margin according to usage requirements. During use, it is necessary to avoid adding additional high-power equipment at will, and it is not allowed to operate for a long time under full load. However, the nature of the work determines that the UPS power system operates almost continuously. Increasing high-power loads, even when working at basic full load, can cause the host to malfunction and, in severe cases, damage the converter.
(5) Due to the high voltage of the combined battery pack, there is a risk of electric shock. Therefore, safety measures should be applied when loading and unloading conductive connecting strips and output lines. Tools should be insulated, especially the output contacts should have anti touch measures.
(6) Whether in float charging operation or charging/discharging maintenance testing, it is necessary to ensure that the voltage and current meet the specified requirements. Excessive voltage or current may cause thermal runaway or water loss of the battery, while insufficient voltage or current can result in battery depletion, all of which can affect the battery’s lifespan, with the former having a greater impact.
(7) In any case, battery short circuits or deep discharges should be prevented, as the cycle life of the battery is related to the depth of discharge. The deeper the discharge depth, the shorter the cycle life. In capacity testing or discharge maintenance, it is usually sufficient to discharge at 30% to 50% of the capacity.
(8) High current charging and discharging of batteries should be avoided. Although high current can be accepted during charging, it should be avoided as much as possible in practical operation, otherwise it will cause the expansion and deformation of the battery plates, causing the active material of the plates to fall off, increasing the internal resistance of the battery, and the higher the temperature rise. In severe cases, it will cause a decrease in capacity and premature termination of life.