What does UPS capacity mean? How to estimate the capacity of a UPS power supply? For UPS power supplies, the UPS battery is also one of the important components. The dynamic calculation of battery capacity, calculated by integrating the battery current over time, reflects how much capacity is charged or discharged into the battery, while sometimes it is necessary to have a general idea of how good or bad the battery is, hence the need for capacity estimation. Here to introduce the UPS capacity is what it means? How to estimate the capacity of a UPS power supply?
What does UPS capacity mean?
Uninterruptible power supply capacity will shut down power into bypass mode when the data center load exceeds the power supply capacity. the IT workload will function against an unfiltered utility power supply that is good most of the time. Modern computer equipment is not as sensitive as previous generation versions, which is why economy mode uninterruptible power supply capacity is popular.
UPS power supply capacity overruns lead to financial waste: additional capital on redundant UPS with bills that never stop paying for unneeded power and spending on cooling at hot spots. 20-30% excess UPS capacity size is normal and acceptable. When new IT system equipment is updated, the excess capacity provides additional space for peak IT system capacity and short-term parallel operations. But when the capacity size exceeds the expected growth by 3-4 times it becomes wasteful.
Uninterruptible power supply capacity and workload is 1:1. 70KW of workload is divided into 35KW for each 100KW of UPS capacity on average, which is only 35% of the UPS capacity rating, that's why we need only one UPS capacity and to use modularity, in order to avoid more excess power capacity.
How to estimate the capacity of a UPS power supply?
The first thing is to confirm the power of the equipment we want the UPS to carry, and then you can confirm the power of the UPS. It is generally recommended that the load power accounts for 30% to 80% of the UPS power. If the load is too large, such as when starting at the same time may cause the UPS power supply overload, the load is too small not only caused by the waste of the battery performance is also bad.
The basic method of capacity estimation is: to obtain a set of intact standard battery 0.05C10A discharge voltage curve, the battery is discharged at 0.05C10A current, every now and then to compare the discharge end voltage and discharge capacity. For example, a standard battery 0.05C10A discharge to 12.5V for 200 minutes, while the measured battery 0.05C10A discharge to 12.5V for only 150 minutes, then the battery's resting capacity of the rated capacity of 150/200 * 100 = 75.
Online UPS power supply general power factor of 0.8, 1800W ÷ 0.8 = 2250VA, consider the UPS power supply capacity redundancy, generally to 20% to 30% (because the best working condition of the UPS power supply is the load 70% to 80%); so the design of the recommended UPS power supply capacity should be 2250VAX1.3 = 2925VA, which can be derived from the choice of 3000VA UPS.
Power Factor: The phase difference of sinusoidal AC voltage and current is the power factor angle, expressed in Φ, without unit. The cosine of this power factor angle is the power factor. The power factor of a purely resistive circuit is 1, while the power factor of a purely inductive-capacitive circuit is 0. The power factor cosine Φ = P/S.
The above is the definition of UPS power supply capacity and UPS power supply estimation method. When buying a UPS power supply you need to know the actual capacity of the UPS power supply, the capacity of various brands of UPS power supply varies. There is also a need to know the real power of the actual load, so as to decide whether to choose a large or small UPS power supply capacity, to be applied flexibly.
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