Sizing a UPS for your Data Center

Today one of my Buddy came and ask me lots of question on Sizing a UPS for there new office and i can see the complexity which every IT Manager faces while sizing the UPS for there Data-center or Server Room hope these below instructions will reduce your pain and headache .

Make the excel sheet and computes these formulas . I will put a excel Template soon here .

Step 1 List all the equipment to be protected by the UPS in one column. Examples are computers, monitors, modems, PBX phone systems and other network hardware.

Step 2 Read the nameplate on each of the pieces of equipment and write down the volts and the amps next to each piece of equipment using another column. An example would be 120V and 2.0A.

Step 3 Multiply the volts and the amps of each piece of equipment and enter the total in a column labeled as "VA". When the equipment is only rated as watts, convert it to VA by multiplying that figure by 1.43 and enter it in your "VA" column.

Step 4 It's better to calculate A/C usage out of this scope and plan the Electrical architecture based on Generator fail back plan.

Step 5 It’s recommended once you have the total VA load to add an additional 30% to that figure to accommodate any future growth. It’s also a good safety precaution to avoid the potential of overloading a UPS.