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Considerations when selecting a UPS

  The importance of correct sizing of a UPS can’t be overstated. If power outages occur and the data center doesn’t have UPSes in place that can meet necessary power requirements, the result will be potentially business-crippling downtime. Narrowing down what you need in UPSes can be difficult, and the number of options available can complicate matters. “You have to start with some basics and be armed with some knowledge before making a selection. Know the minimum time UPS batteries must provide power and the maximum runtime needed. You’ll also need to know the voltage of the electrical service that will power the UPS and perhaps most importantly, know the total load of all equipment you’ll connect to the UPS, so you can make sure the unit is sized correctly for the load necessary . You’ll also need to make sure you have enough physical room to place the needed equipment. Along with a firm understanding of the equipment you want to protect right now,  you’ll also want to consider what equipment you might be adding over the next 24 to 36 months, a safety margin of 50% for a new installation is usually the rule of thumb to allow for growth.  Also be sure to account for unexpected additions that will inevitably crop up. Doing so will ensure you avoid purchasing a UPS that meets your needs now but becomes outdated in the near future.  UPS Checklist:    Detrmine your power and protection requirements  Ensure the UPS can handle the required load  Make certain the UPS provides sufficient run time and capacity  Consider outsourcing battery instalation, maintenance, and disposal duties  Determine  warranty, insurance and guarantee requirements  Many UPS manufactuers have some handy on-line tools to help you come up with the right product for your application. Here are a few: http://www.apc.com/tools/ups_selector/index.cfm http://www.minutemanups.com/products/mmsmu.php   ( exerpts of this article courtesy of Processor Magazine)
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