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Sizing UPS Battery Packs for Extended Power Outages

by informsarakhan
UPS Battery for Extended Power Outages

The battery pack in an uninterruptible power supply (UPS) system acts as the heart and lungs of the system and holds the load during brief power outages until another power source or backup power source (e.g., a diesel generator) comes on, or provides power during an automatic shutdown.

The UPS battery should be designed for a given run time, typically measured in minutes or hours, for a given load in watts, kW, or MW. These load-specific factors are incorporated into the battery sizing algorithm. Which also takes into account a number of criteria such as ambient temperature, UPS efficiency, and the UPS system used.

While battery manufacturers provide battery curves and discharge tables to assist in the selection process, experienced UPS manufacturers use specific battery sizing software that takes into account their product characteristics. In addition, batteries are. Typically standardized to the specific battery type and runtime, as well as to the manufacturer’s own cabinets and battery racks.

The combination of uninterruptible power supplies and battery packs included in the solution should match the calculated load as closely as possible. For example, if the total load (including UPS losses) is 20 kW, the most appropriate UPS system would be a 30 kVA/24 kW system. To ensure 30 minutes of run time in this scenario, the closest battery choice would be, for example, 38Ah, which would ensure 25 minutes of run time at 24kW and 33 minutes at 20kW.

Several factors must be considered when sizing the battery set for an uninterruptible power supply. In particular, the site’s power supply history is important in determining the depth, frequency, and probability of grid outages. The size of the critical load must be. Determined. Facilities with backup generators should consider this.

What is the operating time required for load interruption and orderly shutdown? The environment must also be.  Considered, such as available floor and shelf space, and whether it is hot and humid or cold and dry. The economic impact must also be. Considered, especially in a difficult economic climate where costs must be. Reduced. For example, what is the cost of installing multiple batteries to ensure a certain run time versus stand-alone backup power or fuel cells?

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Comparing run times quoted by different UPS manufacturers can be misleading. First, it is difficult to compare battery run times from different manufacturers without a common standard. The best solution is to ensure that all runtime data is. Reported using the same formula, i.e., load/watt rating and load power factor. For example, a 10 kVA UPS supporting an 8 kW load with 0.8 pF would have an operating time of 14 minutes with the internal 12 Ah battery. However, with a 75% load (6 kW) and 0.6 pF, the same UPS can run for nearly 20 minutes.

It is possible to estimate the size of the battery bank. Which can be useful in determining the budget during the specification phase of a power supply project. However, the size of the battery bank is so critical to the performance and reliability of the overall UPS system. Battery bank sizing should be. Performed by an industry expert during the design phase to obtain an accurate and reliable figure.

About Author

Sara has completed her education in marketing and started her career as a digital marketer. She is a content writer by profession. And she would love to add multiple things to her knowledge that she can add to her writing style. She writes about backup power solutions like UPS dry battery in Pakistan.




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