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Check this link to learn about different types of UPSs and their usages.
http://www.apc.com/us/en/faqs/FA157448/
ups capacity can be calculated subject to the critical loads in the project >>you should sum all these critical loads , and then choose the nearest standard ups....should not be less than total critical loads
Simply divide the total connected load by 0.64 factor.
It depend on variety of factors that we determine UPS capacity that will meet both current and future needs
a line interactive UPS generates the waveform of its AC output. An on line UPS does this continuously.
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