Power
Requirements for PCs
Add VA
requirements for all components. To find VA(VOLT-AMPS), find the Voltage and
Amperage requirements for each piece of equipment. These numbers should be on a
sticker on the back or bottom of the equipment. Then multiply the numbers
together:
VA = Volts x
Amperes
If your
components are measured in Watts, then multiply the number of Watts by 1.4:
VA = WATTS x
1.4
Add the VAs
of each piece of equipment to find the Total VA. If you cannot determine the VA
for your equipment. You may wish to
oversize the UPS to take into consideration future expansion needs.
APC says
that a 1000VA UPS will support a 100VA device for 2.25 hours.
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Measured
components (with Clamp Meter Amps RMS)
Computer: PentiumPro/200,
96MB, 4.3G HD
Startup:
1.35A
Continuous: .7A - .9A
Monitor:
Viewsonic 15" color
Startup:
1.0A
Continuous: .9A - 1.0A
Monitor:
Iiyama 17" color
Startup:
3.5A
Continuous: 1.5A
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Workstation
Volt/Amp Requirements (CPU + 17" monitor):
Startup: 120V x (1.35 + 3.5)A = 582VA
Continuous: 120V x (.9 + 1.5)A = 288VA
Server
Volt/Amp Requirements (CPU + 15" monitor):
Startup: 120V x (1.35 + 1.0)A = 282VA
Continuous: 120V x (.9 + 1.0)A = 228VA
Continuous CPU only: 120V x .9A = 108VA