How to Size An
Uninterruptible Power System (UPS)
Electronic systems are critical to your
business. They need UPS protection. The next question is:
- What size UPS
works best for your systems?
- How do you ensure that your UPS will grow
with you?
Follow these simple steps to configure what size UPS your
systems need:
- List all equipment to be protected by the UPS. (Remember to
include all monitors, terminals, external hard drives, hubs, modems,
routers and any other critical equipment.)
- List the
amps and volts. These figures can be found on a
plate on the back of the equipment. Mulitply amps by
volts to determine VoltAmps (VA). Some devices may list their
power requirements in watts (W). To convert watts to VA,
multiply watts by 1.4.
- Multiply the VA by the number of pieces of equipment
(Quantity) to get VA Subtotals.
- Add the VA
Subtotals to get a Total.
- Multiply the Total by 1.2 to get the Grand Total.*
- Use the Grand
Total figure to select a UPS. When choosing a UPS
be sure that the total VA requirement of supported equipment does not
exceed the UPS VA rating.
*Step 5 is for future
expansion. If you do not intend to add any more equipment to the UPS, skip
step 5 and copy the total figure into the Grand Total box. You may want
to oversize the UPS to take into consideration any future expansion needs.
Choose a UPS with a VA capacity at least as large as your system's total
requirement.
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