When does the UPS battery need to be replaced?
When does the UPS battery need to be replaced? UPS uninterruptible power supply batteries are recommended to use brand high-quality, maintenance-free batteries. Users must not choose inferior UPS uninterruptible power supply batteries for cheap because they will have self-discharge (SELF-D1SCHARGE). If they are left unused for a long time, energy will be lost, so they need to be charged and discharged regularly. Engineers can judge whether the battery is good or bad by measuring the open circuit voltage of the battery. Take a 12V battery as an example. If the open circuit voltage is higher, it means that the battery has more than 80% of energy storage. If the open circuit voltage is lower, the battery should be charged immediately. , If the open circuit voltage is lower than 12V, it means that the battery stores less than 20% of the electric energy, and the battery is in danger of unbearable use.
The maintenance-free battery adopts an absorption electrolyte system, so it will not produce any gas during normal use. However, if the user uses improperly and causes the battery to overcharge, it will produce gas At this time, the internal pressure of the battery will increase, and the pressure valve on the battery will be opened, which will cause the battery to swell, deform, leak or even rupture. These phenomena can be judged from the appearance, such as the above situation The battery should be replaced immediately.
Load selection
Not all electrical equipment needs to use UPS, and similarly, UPS is not suitable for all electrical equipment. When the user chooses the UPS load, he should mainly consider the size, the characteristics of the load device, the importance of the load device, and the degree of influence of bad power on the load.
(1) Characteristics of load device
The power supply mode of AC load is generally divided into two kinds of single-phase and three-phase. Low-power loads, with power ranging from hundreds of VA to 100KVA, generally use single-phase power supply, and single-phase output UPS; while high-power loads, with power from tens of KVA to 1000KVA, mostly use three-phase power supply, so you need to choose Three-phase output UPS.
The load types can generally be divided into linear loads such as resistive, inductive, capacitive and non-linear loads with built-in rectifier circuits (also known as rectifier loads). Computers and their peripheral equipment are mostly non-linear loads. UPS is suitable for resistive loads and capacitive rectifier loads.
Non-linear loads such as inductive and capacitive loads have an inrush current at startup. Even when rectifying loads such as computers are in normal operation, their crest factor is 2~3, that is, the peak value of the current is its effective value. 2~3 times of the power supply, so this feature should be considered when choosing UPS, and a certain margin should be left for UPS. For some inductive loads with low power factor, such as air conditioners, the starting current is quite large, up to 5~7 times of its rated value, and frequent starting, so generally small and medium-sized UPS is not suitable, unless there is enough margin.
(2) The influence of bad power on the load
(3) Calculation of load size and UPS capacity
General electrical loads will be rated at their rated power or rated Parameters such as current and power factor, but because different types of loads are quite different, and the total power cannot be much different, the total power cannot be simply added but the vector sum should be calculated. Fortunately, under normal circumstances, user loads are mostly computer equipment with a power factor between them. Therefore, the total power can be calculated by adding up the rated power of each load. For some other types of loads such as printers, they can be adjusted according to the startup size. The rated power is multiplied by a factor and then calculated. According to the UPS of the total load capacity, you can generally choose according to the following formula: UPS capacity >u003d load capacity ÷, that is, the load capacity should be less than 80% of the UPS rated capacity. The choice of 80% load is mainly due to the inrush current of load starting and the needs of users to expand capacity in the future.
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