Uninterruptible power supply capacity

UPS (Uninterruptible Power System) is a constant voltage and constant frequency uninterruptible power supply that includes energy storage devices and an inverter as the main component. Mainly used to provide uninterrupted power supply to a single computer, computer network system, or other power electronic equipment. When the mains input is normal, the uninterruptible power supply stabilizes the mains voltage and supplies it to the load for use. At this time, the uninterruptible power supply is an AC mains voltage stabilizer, which also charges the internal battery; When the mains power is interrupted (accident power outage), the uninterruptible power supply immediately supplies AC power from the internal battery to the load through inverter conversion, so as to maintain normal operation of the load and protect the software and hardware of the load from damage. Uninterruptible power supply equipment usually provides protection against both high and low voltage.

What problems will occur if the capacity size of the uninterruptible power supply is selected incorrectly?

The estimated capacity of the uninterruptible power supply is small, and the problem is obvious. When the load in the data center exceeds the power capacity, the uninterruptible power supply capacity will shut down the power and enter bypass mode. The IT workload will have an impact on the unfiltered public power supply that is good for most of the time. Modern computer equipment is not as sensitive as the previous generation version, which is why the economic mode uninterruptible power supply capacity is popular.

The excess capacity of uninterruptible power supplies has led to a waste of funds: additional capital is added to the excess uninterruptible power supply capacity, including bills that never stop paying for unnecessary power supplies and expenses for cooling at hotspots. It is normal and acceptable for the capacity of an uninterruptible power supply to exceed 20% -30%. When updating new IT system equipment, the excess uninterruptible power supply capacity provides additional space for peak IT system capacity and short-term parallel operations. But when the capacity of the uninterruptible power supply exceeds the expected growth by 3-4 times, waste occurs.

The miscalculation of uninterruptible power supply capacity is truly concerned with redundant systems. The additional uninterruptible power supply capacity is provided as a backup. If your uninterruptible power supply capacity is 30%, you are using 70% of the 100KW design capacity, but in reality it is only 47% of the total 150KW.

The capacity and workload of the uninterruptible power supply are 1: 1.70KW. On average, each 100KW uninterruptible power supply is divided into 35KW, which is only 35% of the rated power of the UPS capacity. This is why we only need one uninterruptible power supply capacity and adopt modularization to avoid more redundant power supply capacity. Increasing the capacity of a 2N uninterruptible power supply by 50% means that each power supply only has 25% of its capacity in use. This will be a terrifying point on the efficiency curve.