In addition the above mentioned, I would reccomend not to forget your TCO. Check the effeciency on the UPS, the installation costs and also the following service costs.
In order to get the most out of your batteries, the room temperature should be static around 20 Celcius (depending on the manufactor), so perhaps if possible, it would be a good idea to have the UPS in a seperate room than where your HW is.
Some UPS brands such as MGE allows the opertunity to upgrade the UPS by exchanging the power module and the isolation transformer. This means, that in case you infrastructure grows, you don't necesarrily need to purchase a new UPS, but you can just upgrade the existing one.
BTW - don't forget to consider redundancy.
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Henrik Svendsen
Datacenter System Architect
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